Lpz., 1926. 96 pp. 41 ills. Softcover (unbound). - Spine repaired with tape. (In Die tierwelt der Nord- und ostsee V-IX d1). Bestandsnummer des Verkäufers 238101
Titel: Lamellibranchia.
Einband: Soft cover
Buchbeschreibung 27 S., 1 Abb., 2 Tab., 4 Taf., Sprache: Deutsch Gewicht in Gramm: 500. Artikel-Nr. 28942
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Buchbeschreibung Zustand: Gut. 750 Seiten Gebrauchs- und Lagerspuren. Außen: verschmutzt. 26067897/3 Altersfreigabe FSK ab 0 Jahre Taschenbuch, Größe: 15.2 x 4.3 x 22.8 cm. Artikel-Nr. 260678973
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Buchbeschreibung Zustand: Sehr gut. 750 Seiten 26067897/1 Altersfreigabe FSK ab 0 Jahre Taschenbuch, Größe: 15.2 x 4.3 x 22.8 cm. Artikel-Nr. 260678971
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Buchbeschreibung M. Abb. 61-62 u. 1 Textill. S. 427-433. St. a. OU. (Bull. of the British Museum 4,9). Sprache: Englisch 0 gr. Artikel-Nr. 242219
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Buchbeschreibung New taxa: Altenaeum nortoni n. gen., n. sp. 6 pp., 2 figs, 8. Artikel-Nr. W22339
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Buchbeschreibung 21 pp., 11 figs, broch. gr. 8. Artikel-Nr. W02629
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Buchbeschreibung 1. Healthy specimens of Martesia striata L. were obtained from timbers in the Johore Straits in March 1953, and were examined immediately. 2. The siphonal process is of type "C" and resembles that of Pholadidea loscombiana. 3. The shell valves possess a posterior flexible uncalcified portion, comparable with the siphonoplax of Pholadidea loscombiana. 4. The scar of the anterior adductor muscle is smaller than that of the posterior adductor. In this respect Martesia resembles Pholadidea more closely than other genera in the Pholadidae. 5. In large specimens which had ceased to bore, the pedal muscles and the anterior and posterior retractor muscles of the visceral mass had atrophied. The foot also had disappeared. 6. The flat and homorhabdic ctenidia are of Atkins's type C 2. 7. The ciliary sorting mechanisms on the ctenidia and labial palps are suited for the selection of few fine particles and for the rejection of larger quantities even of fine particles. This is considered to be well adapted to life in inshore waters that may occasionally have a very high silt content. 8. The palps are extremely efficient sorting organs and the ciliary mechanisms on the folded surfaces are comparable with those reported for other genera in the Pholadidae. 9. The ciliary cleansing mechanisms on the surfaces of the visceral mass and mantle are described. 10. There is no appendix to the stomach. In other respects the alimentary canal is closely similar in structure and function to that of other members of the Pholadidae. 11. There is an anterior median fenestra joining the cavities of the distal limbs of the left and right excretory organs as is found also in Barnea parva and Zirphaea crispata. 12. There is a transverse connective between the left and right cerebrovisceral connectives, immediately anterior to the visceral ganglia. This transverse connective is slightly swollen to form an accessory visceral ganglion, as in other genera of the Pholadidae. 13. There is an indication of slight sexual dimorphism, affecting the form both of the genital aperture and of the anal papilla. 14 pp., 7 figs, br. gr. 8. Artikel-Nr. W17524
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Buchbeschreibung 1. Detailed studies have been made of the structure and function of the stomach in the two protobranchs, Nucula nucleus L. and Nuculana minuta (Müller). 2. The structure of the stomach in the Protobranchia was described and figured, and defined as Stomach Type I. 3. The stomach of the septibranch Cuspidaria cuspidaia (Olivi) was similarly examined, described and figured, and was defined as Stomach Type II. 4. The stomachs of the Protobranchia and Septibranchia were compared and it was noted that there were several common features. Further resemblances were found in the structure of the digestive diverticula, and in the muscular pumping of water by the ctenidium (Nuculana) or by the septum (Cuspidaria). 5. It was concluded that there is a strong suggestion of phylogenetic relationship between the Protobranchia and the Septibranchia. 6. The view, previously stated by Yonge, that there was no justification for linking the Protobranchia and the Arcacea in an order Taxodonta was upheld. 15 pp., 5 figs, br. gr. 8. Artikel-Nr. W17525
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Buchbeschreibung 17 pp., 5 figs, gr. 8. Artikel-Nr. W07218
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Buchbeschreibung 24 pp., 10 figs, 4. Artikel-Nr. W07913
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