90 VAGINULIDA—ONCHIDIID A. 
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 night, 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 day ; they crawl quickly and leave 
no slimy trace behind them like the Limacide. 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. 
Famity VAGINULID A. 
Characters those of the following genus :— 
Vacinutus, Stoliczka. 
Syn.—Vaginula and Veronicella, part, of authors. 
Distr.—Cochin China ete: Ve. Taunaysit, Fer. (ci, 62). 
Animal limaciform, subeylindrical, 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. 
LimMace.us, Blainv., 1817. 
Distr.—L. Elfortianus, Blainv. (ci, 63 
Animal 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. 
Famity ONCHIDIID A. 
Characters those of the genus Onchidium. The mantle, as in 
Veronicellidz, covers the entire back; the mouth is covered by 
a buccal veil. Aquatic. 
