. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 180 PTEROPODA. ated on the right side of the neck beneath the corresponding lateral fin : the liver is of no great bulk, and forms a nearly globular mass. The organs of generation consist of an ovary which occupies the greater portion of the right side; of an oviduct of moderate length ; of a testicle which is almost as large as the ovary, and of a common deferent canal. The penis is here, as in Clio, an organ al- together distinct from the testicle : it is situ- ated, as already said, beneath the oesophagus, where it is
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 180 PTEROPODA. ated on the right side of the neck beneath the corresponding lateral fin : the liver is of no great bulk, and forms a nearly globular mass. The organs of generation consist of an ovary which occupies the greater portion of the right side; of an oviduct of moderate length ; of a testicle which is almost as large as the ovary, and of a common deferent canal. The penis is here, as in Clio, an organ al- together distinct from the testicle : it is situ- ated, as already said, beneath the oesophagus, where it is folded upon itself; and when pro- truded, issues through an orifice placed in the front of the neck and a little below the mouth. Tt is represented in situ in Jig. 11 -i. 7, and detached in 8. The brain (/£. 114. 7, r) is large, flat, and of a square form, slightly narrowed pos- teriorly : the nerves issue principally from its angles, two of them going to join a double ganglion situated beneath the oesophagus. The salivary glands appear to be wanting. PNEUMODKRMA.— Another genus of the Pteropod Mollusca, anatomized by Cuvier, embraces the Pneitmoderma, which presents many peculiarities of structure, more es- pecially as relates to the position of the re- spiratory organs and the tentacula placed at the sides of the mouth and other anatomical details, so that it will require to be described at length. In this genus, the body is without a shell, having two fins situated on the sides of the neck, but is distinguished by having two bunches of tentacula in the vicinity of the mouth, and by carrying its branchial organs at the surface of its body near its posterior ex- tremity. The body of this mollusk is of an oval shape (Jig- S15. 1, a), the head (6) is round, Fig. 115. (I to 9).. 3. The same placed with the head downwards, and seen from the right side to show the branchiae. 4. The same enlarged and shown in the position of Jig. 1. The skin is divided and turned aside to show
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