GASTEROPODA. 195 
regained the surface, in the same manner as Rang’s genus Litiopa. 
[C. Pickering. | 
SHELL small, thin, ovate, covered with a ereenish straw-coloured 
epidermis, which, under the magnifier, is found to be marked with 
numerous, crowded, undulating, revolving stri#: whorls five, ventri- 
cose, the last one having a raised thread-like carina at the periphery : 
aperture half the length of the shell, semicircular: canal of the colu- 
mella semicylindrical, extending to the base : a delicate layer of callus 
on the penultimate whorl. 
Length three-tenths of an inch; breadth one-fifth of an inch. 
Inhabits Puget Sound; dredged at Classet. Pickering. 
Very much like the dark variety of L. vincta of the Atlantic shores 
in colour and marking, but it is less elongated. Our shell occasion- 
ally has the last whorl perceptibly angular, but never with the filiform 
carina. 
Figure 230, an elongated specimen; 2304, a short specimen, front 
view ; 230}, back view of the same. 
Liriopa pEcussata (Gould). 
Testa parvula, perfragilis, acuto-conica, badia: spira anfractibus octo 
convexis, transversim striatis, apicalibus plicatis: apertura ovata 
antice subtruncata ; labro simplci ; columella arcuata, antice uniden- 
tata. 
Intiopa decussata, Goutp; Proceed. Boston Soc. Nat. Hist., iii. 75. 
Noy. 1848. Expedition Shells, 52. 
Anrmat light brown ; head terminating in a proboscidiform muzzle ; 
tentacles two, long, slender, obtuse; eyes black, just behind the 
tentacles ; foot short, subquadrate, motions very lively. 
SHELL conical, elongated, thin and fragile, dark brown, covered 
with a thin epidermis, lines of increment distinct, and these are 
