90 VAGINULID^ — ONCHIDIID^. 



under the trunks of trees and in fissures near the water, or on 

 dry ground, and are never truly aquatic. They quit their retreats 

 during the niglit, or during the day when it rains ; remaining in 

 a torpid state during the dry season. The species of the Old 

 World live principally upon the trees in shady places and damp 

 parts of the forests, concealing themselves under the leaves 

 during the greater part of the daj?^ ; they crawl quickly and leave 

 no slimy trace behind them like the Limacidi». Their eggs are 

 large and oval, ten or fifteen being joined together in a necklace- 

 like, gelatinous thread, which is coiled, and more or less covered 

 with mucus. 



Family YAGINrLIDiE. 



Characters those of the following genus : — 



Vaginulus, Stoliczka. 



Syn. — Yaginula and Veronicella, part, of authors. 



Bistr. — Cochin China, etc. V. Taunaysii, Fer. (ci, 62). 



Animal limaciform, subcylindrical, high on the back, slender 

 and pointed at tail ; tentacles bifid ; mantle covering the whole 

 back ; no longitudinal furrows above the margin of the foot, 

 and no caudal mucous pore ; no distinct locomotive disk ? exter- 

 nal anal and respiratory orifice at the lower right side of the 

 mantle about two-fifths of the length of the body distant from 

 the front ; generative orifices distinct, the female with the respi- 

 ratory orifice as above described, the male orifice behind and 

 below the right eye-peduncle. 



No shell. 



No jaw. Lingual membrane short ; teeth aculeate. 



For a notice of this agnathous genus as restricted from Veron- 

 icella, see Stoliczka, Jour. Asiatic Soc. Bengal, 2d series, vol. 

 xlii, number clxxxi, p. 33. 



LiMACELLUS, Blainv., 1811. 



Distr. — L. Elfortianus, Blainv. (ci, 63). 



A nimal elongated , subcylindrical ; the foot covering the whole 

 ventral surface, and only separated from the back by a groove ; 

 back enveloped in a thick skin, forming anteriorly a sort of 

 mantle over the pulmonary cavity, the orifice of which is at the 

 right side ; generative orifices distant, that of the male at the 

 base of the right tentacle, oviduct at the posterior part of the 

 right side ; the two communicating by a groove. A doubtful 

 genus. 



Family ONCHIDIID^. 



Characters those of the genus Onchidium. The mantle, as in 

 Veronicellidse, covers the entire back ; the mouth is covered by 

 a buccal veil. Aquatic. 



