Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 are composed of leaflets, more or less divided, at- tached along the right side {jig. 80, hr)^ or on the back (Jig. 81), and more or less covered by the mantle, which almost al- ways encloses a small â. o^ ,-'.,. . , . , Fiff. 80. PLKUROBRANCHUS. shell in Us thickness.â Their form is very variable. They are divided into Pleurohran- chusy Pleurohranchides, Aplysia, Dolabella^ Akera, &c. 37. The Pleurobrajvchi are mol- lusks of an oval form ; in which the t br
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 are composed of leaflets, more or less divided, at- tached along the right side {jig. 80, hr)^ or on the back (Jig. 81), and more or less covered by the mantle, which almost al- ways encloses a small â. o^ ,-'.,. . , . , Fiff. 80. PLKUROBRANCHUS. shell in Us thickness.â Their form is very variable. They are divided into Pleurohran- chusy Pleurohranchides, Aplysia, Dolabella^ Akera, &c. 37. The Pleurobrajvchi are mol- lusks of an oval form ; in which the t branchite are fixed on the right side, between the mantle and foot {fig. 80). y The mouth is in the form of a proboscis i or trunk, and is surmounted by a small triangular veil, and two tentacles; they have four stomachs, the second one of which is sometimes armed with bony pieces, and the anus opens behind the branchife. One species, of a lemon yellow colour, is found on the coasts of â m France. jj 88. The Aplysi-^, which the ancients called sea-hares, have a very singular form; the body resembles that of a sort of Limax; but the edges of the foot, erected in flexible crests, surround the back and may be even reflected over it. Their head is supported by a neck of greater or less length, and furnished with four tentacles (fg. 81, t), the two upper ones being hollowed like the ears of a quadruped, and placed above the eyes (y). The branchiae, in the form of very complicated Fig. 81.âAPLYSIA. Explanation of Fig. 80.âm. the mantle, raised up to show the branchioB, hr ;âa. the anus ;âb. the mouth and trunk ;âv. the veil;ât. the tentacles ; âp. the foot. Explanation of Fig. 81.ât, t. the tentacles ;ây. th5 eyes ;âw. the mantle ; â6. the branchice. 37. What are the characters of the genus Pleu'robranchus ? (Pleuro. branchus, from the Greek, pleura, side, and bragchia, gills.) 38. What are the characters of the genus Aplasia? (Aplysia, from the Greek, aplusia, unclean
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