190 



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. ONCIDIIDAE, Philippi. Limaciform naked marine animals, without a 



Kin. 179. 



Vayinulii hizonicn. .1, dorsal aspect; 11, ventral asj)e(jt. I, posterior tentacle; II, anterior 

 tentacle; III, mouth ; IV, mantle ; V, female oriiice ; VI, foot ; VII, anus. (After Souteyet.) 



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 



Fio. 180. 

 Onculiuni tongaiium, left-side view. (From l^ankester, after Quoy and Gaimaul.) 



accessory apparatus ; from the Indian Ocean. OncMiella, 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. Aniaudrnt. La partie anterieure du ti^e digestif ct la torsion chcx les 



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



2. Hacker. Die Auge einiger Gastropoden. Arh. Xool. Instit. Wien, xiv. 1902. 



3. Baiidelot. Hecherches sur 1'appareil geudrateur dcs Mollusques Gasteropodes. 



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



1. Bontan. La cause principale de 1'asyme'trie des Mollusques Gasteropodes 

 Arch, dc Zool. Expe'r. (3), vii. 1899. 



