i go 



LITERATURE OF THE GASTROPODA 



animals, without a shell ; the female orifice on the right in the middle of the 

 body; the anus posterior. Genus Vaginula, Ferussac (Fig. 179). FAMILY 

 2. OXCIDIIDAE, Philippi. Limaciform naked marine animals, without a 



Fin. 179. 



Vaginula luzonica. A, dorsal aspect ; Ji, ventral aspect. I, posterior tentacle ; II, anterior 

 tentacle ; III, mouth ; IV, mantle ; V, female orifice : VI, foot ; VII, anus. (After Souleyet.) 



shell ; female orifice near the anus, at the posterior end of the body ; a 

 reduced pulmonary cavity with a distinct pneumostome (Fig. 59, pns). 

 Genera Oncidium, Buchanan ; body elongated and narrow ; penis with 



FIG. 180. 

 Oncidium tonganitm, left-side view. (From Lankester, after Quoy and Gaimard.) 



accessory apparatus ; from the Indian Ocean. Oncidiella, Gray ; body 

 oval ; mantle thick, with an emarginated border ; penis without accessory 

 apparatus; British (Fig. 59). Peronia, Blainville ; body oval ; the mantle 

 covered -with ramified appendages and oculiferous tubercles. 



LITERATURE OF THE GASTROPODA. 

 A. Gastropoda generally. 



.,1. Amaudrut. La partie anterieure du tube digestif et la torsion chez les 

 Mollusques Gasteropodes. Ann. des Sci. Nat. Zool. (8), vii. 1898. 



2. Backer. Die Auge einiger Gastropoden. Arb. Zool. Instit. AVien, xiv. 1902. 



3. Baudelot. Recherches sur 1'appareil generateur des Mollusques Gasteropodes. 



Ann. des Sci. Nat. Zool. (4), xix. 1863. 



r 4. Boutan. La cause principale de 1'asymetrie des Mollusques Gasteropodes. 

 Arch, de Zool. ExpeY. (3), vii. 1899. 



