Marine Mollusca from the South Shetland Islands. 271 
brown ; whorls 3, rapidly increasing, the last very large, 
smooth but for lines of growth; suture impressed ; columella 
margin almost vertically descending in a very slight curve, 
angled towards the base ; labrum simple; aperture roundly 
ovate, gaping, large for the size of the shell. 
Ait. 2, diam. maj. 2, diam. min. 1°75 mm. 
Hab. Bransfield Strait, South Shetland; washed from 
sea-weed from a depth of 15 fathoms (A. G. Bennett). 
Pellilitorina bransjieldensis, sp.n. (Fig. 5.) 
Shell ovate, subcorneous, perforate, dull purplish brown, 
polished, shining; whorls 34, rapidly increasing, smooth ; 
suture impressed; umbilicus moderately wide, deep; colu- 
mella margin rather obliquely descending in a gentle curve, 
spreading above into an ill-defined parietal ee labrum 
simple ; aperture ovate, wide, large for the size of the shell ; 
operculum horny, three-whorled, with subcentral nucleus. 
Alt. 5, diam. maj. 5:5, diam. min, 4:25 mm. 
Aperture: alt. 4, diam. 3°5 mm. 
Hab. From stomachs of fish taken in Bransfield Straits off 
Deception Island, South Shetlands (A. G. Bennett). 
Limatula deceptionensis, sp.n. (Fig. 6.) 
Shell small, ovate, white, finely concentrically striate, and 
sculptured longitudinally in the median part with from ten 
to twelve fine costule, which become obsolete and finally 
disappear altogether on either side, in which parts the shell 
shows traces of oblique, distant, radiate striae; umbones 
rather small, prominent ; auriculee of about equal form and 
size ; dorsal margin very gently arched ; ventral margin 
rounded ; anterior side abruptly descending, very gently 
rounded ; posterior side a little less abruptly descending and 
more rounded. 
Long. 5:5, lat. 4°5 mm. 
Hab. Dredged inside Deeeption Harbour, South Shetlands, 
in 6 fathoms (A. G. Bennett). 
Lissarea bennetit, sp.n. (Figs. 7, 7 a.) 
Shell differing from L.rubrofusca, Smith*, from Kerguelen, 
in its darker colour, it being of a dark purplish tint, in its 
rather more produced anterior side, and broader posterior 
* Phil. Trans. Roy. Soc. 1879, vol. clxviii. p. 19, pl. ix. fig. 17. 
