The Cambridge natural history . l in Fterotrachaea orFiroloida. The Heteropoda are dioecious. In the male there is aflagellum behind the penis, which is near the middle of the right •side. Fterotrachaea lays long chains of granular eggs, and hasbeen noticed to produce a metres length in a day. The eggsof Atlanta are isolated. The embryo has a deeply bilobedvelum. Fam. 1. Fterotrachaeidac.—Body long, with a caudal fin ; branchiae dorsal, free or partly protected by a shell; foot consist-ing of a muscular disc, with or without a sucker. Fterotrachaea proper has no mantle, shell, or tentacles. Th
The Cambridge natural history . l in Fterotrachaea orFiroloida. The Heteropoda are dioecious. In the male there is aflagellum behind the penis, which is near the middle of the right •side. Fterotrachaea lays long chains of granular eggs, and hasbeen noticed to produce a metres length in a day. The eggsof Atlanta are isolated. The embryo has a deeply bilobedvelum. Fam. 1. Fterotrachaeidac.—Body long, with a caudal fin ; branchiae dorsal, free or partly protected by a shell; foot consist-ing of a muscular disc, with or without a sucker. Fterotrachaea proper has no mantle, shell, or tentacles. Thebranchiae are disposed round the visceral sac, at the upper partof which is the anus. In Firoloida the body is abruptly trun-cated behind, with a long filiform segmented caudal appendage;visceral sac at the posterior end: fin-sucker present or absent inboth male and female. Cardiapoda resembles Carinaria, but thevisceral sac is more posterior and is only slightly protected by 42 2 MONOTOCARDIA GYMNOGLOSSA RACHIGLOSSA Fig. 279.— Carinnria mediterranea Lam., Naples:a, anus ; br, branchiae ; /, foot; i, intestine ;m, month ; p, penis ; s, sucker ; sh, shell ; I,tentacles. x i. a very small spiral shell. Carinaria (Fig. 279) has a rugosetranslucent skin, visceral sac sub-median, apparently peduncu-lated, covered by a capuliform shell. The larval shell, whichpersists in the adult, is helicoid. Fam. 2. Atlantidae.—Shell spiral, operculate, covering the animal. Branchiae in adorsal cavity of the mantle ;foot trilobed, with a smallsucker on the shell of Atlrmta isdiscoidal and sharply keeled,while that of Oxygyrus isnautiloid, with the spireconcealed, no keel, aperturedilated. (c) Gymnoglossa.—Ea-dula and jaws absent; pro-boscis prominent, sexes prol)al)ly separate, penis present. Thesection is probably artificial and unnecessary, the families com-posing it being, in all probability, Taenioglossa which have losttheir radula in consequence of changed con
Size: 2025px × 1234px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
