A Manual of Zoology for the Use of Students: With a General Introduction On ...
A Manual of Zoology for the Use of Students: With a General Introduction On ...
Nicholson Henry Alleyne
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The sexes are united in the same individual. 478 MANUAL OF ZOOLOGY. The " Winged Snails " or Pteropods are of small size, and are found swimming near the surface of the open ocean, often in vast numbers. They are related on the one hand to the Gastropoda^ and on the other hand to the Cephalopoda. There is no distinctly diflferentiated head, and the mouth is placed anteriorly in the centre of the fore-part of the foot. The lateral parts of the foot ("epipodia") are developed into a pair of wing-...like fins (fig. 281, tf), by means of which the Fig. a8z. — Pteropoda. A, S^iriaiis rostralis, B^ Pneumodirmon vioUueum. C, Hetertifusus buiimirundes. All enlarged, e Epipodia or fins; / Tentacles. D, Larva of CUodora lastceoUUa^ greatly enlarged (after Fol) : v Velnm ; o Mouth ;
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