Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 Fig. 85.—GLAUCUS. ORDSR OF GiLSTEROFODiL HETEROFODil. 43. These gasteropods are not organized, like all the pre- ceding, for crawling on the belly, but for swimming only. In fact, their foot, in place of forming a horizontal fleshy disk, is compressed into a vertical membranous plate, which is used as a fin. Their body is formed of a transparent, gelatinous sub- stance, and their branchise are placed on the posterior part of the back. The principal genera of
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 Fig. 85.—GLAUCUS. ORDSR OF GiLSTEROFODiL HETEROFODil. 43. These gasteropods are not organized, like all the pre- ceding, for crawling on the belly, but for swimming only. In fact, their foot, in place of forming a horizontal fleshy disk, is compressed into a vertical membranous plate, which is used as a fin. Their body is formed of a transparent, gelatinous sub- stance, and their branchise are placed on the posterior part of the back. The principal genera of this group are the Carinaria and FlOROLA. y e hr c / Fig. 86.—CARINARIA MKDITERRANEA. Explanation of Fig. 8G.—h. the mouth ;—t. the tentacles;—y. the eyes;— e. the stomach;—/. the liver ;—c. the shell;—hr. the branchiae ;—p. the foot; —r. a small sucker situate on the side of the foot. 43. What are the characters of the Heteropo'da ? (Heteropoda; from the Greek, eleros^ various, and poMS, foot.)
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