A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . Fig. 3. A Fteropod. § The other mollusca ai-e acepJialoKS, or destitute of any dis-tinct head; they are all aquatic, and most of them are attached,or have no means of moving from place to place. They are di-vided into three classes, characterized by modifications in theirbreathing-organ and shell. 4. The bracJdapoda^ are bivalves, having one shell placedon the back of the animal, and the other in front; they have no * Gaster, the under side of the body. t Fig. 2. Helix desertorum. Forskal. From a Hving specimen
A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . Fig. 3. A Fteropod. § The other mollusca ai-e acepJialoKS, or destitute of any dis-tinct head; they are all aquatic, and most of them are attached,or have no means of moving from place to place. They are di-vided into three classes, characterized by modifications in theirbreathing-organ and shell. 4. The bracJdapoda^ are bivalves, having one shell placedon the back of the animal, and the other in front; they have no * Gaster, the under side of the body. t Fig. 2. Helix desertorum. Forskal. From a Hving specimen in theBritish Museum, March, 1850. X Pteron, a wing. § Fig. 3. Hyaloea (ridentata. Lam., from Quoy and Gaimard. ^ Brachion, an arm ; these organs were supposed to take the place ofthe feet in the preceding classes. MANUAL OF THE MOLLUSCA. special breathing organ, but the mantle performs that office ; theytake theii- name from two long ciliated arms, developed from thesides of the mouth, with which they create currents that bringthem
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmollusks, bookyear185
