Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 NUDIBRANCH GASTEROPODS. 65 large fleshy shield above the eyes {fig, 83, v). Many of these ani- p mals effuse a purple liquid. -Some are entirely unprovided with shell, or have only the vestige of a shell: these are the Akeroi properly so called ; others have a shell some- ^ what rolled upon itself, and with- ; out a projecting spire or notch, ^ which is concealed in the thick- ^^g- 83.—bulla hydatis. ness of the mantle ; these form the genus Bullcea; and
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 NUDIBRANCH GASTEROPODS. 65 large fleshy shield above the eyes {fig, 83, v). Many of these ani- p mals effuse a purple liquid. -Some are entirely unprovided with shell, or have only the vestige of a shell: these are the Akeroi properly so called ; others have a shell some- ^ what rolled upon itself, and with- ; out a projecting spire or notch, ^ which is concealed in the thick- ^^g- 83.—bulla hydatis. ness of the mantle ; these form the genus Bullcea; and there are still others in which the shell, only covered by a slight epi- dermis, is more convoluted and sufficiently large to afford a retreat for the animal: these constitute the division of Bulla. ORDER OF GiLSTEROFODiL 41. The mollusks composing this group are without a shell and carry their branchiEe on some part of the back (j^'. 84). The structure of some of their internal organs approximates them to the Pulmonea, the Inferobranchiata, and the Tectibran- chiata ; they all inhabit the sea.
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