440 PYRAMIDELLIDZ. 
simulate the ear-shaped folds characteristic of those organs, 
which in this species are conspicuous, but the proteiform tips 
are only slightly developed. The eyes are very black, not 
quite close to each other, and immersed a little posterior to 
the internal bases of the tentacula. The foot is rather long, 
extending to two volutions, very thin, in front bluntly auricled, 
terminating, when in full march, in an acute point, and carry- 
ing, on a simple lobe at the junction of the foot with the body, 
a pyriform, light corneous operculum, marked with arcuated 
oblique striz of growth. 
The animal is free, creeps with rapidity, and dwells in 
muddy ground mixed with shelly spoil in 14 fathoms water, 
off Teignmouth, Devon. This species has never before been 
observed alive. 
I have examined several live specimens of that variety of 
the present species termed by authors Eulimella affinis, and 
I find that the animals of the two are identical ; the only dif- 
ference is in the shell, which in the “ affinis” is more taper, 
and has the whorls more rounded and better defined by the 
divisional lines. 
Cu. FENESTRATA, Forbes. 
Ch. fenestrata, Brit. Moll. ii. p. 249, pl. 93. f.6, 7; and iv. p.277. 
Animal inhabiting a longitudinally-plcated and spirally- 
ridged, white shell of eight rather flat volutions, which bevel 
from their bases to the sutural lines; the apex has the usual 
reflexion of the tribe. The general colour of the external 
organs is a subhyaline frosted-white, the mternal posterior 
volutions are a deep red-brown. Mantle even with the aper- 
ture, except a small shoot at the upper angle. Rostrum 
slender, long, flat, barely hollowed at its termination. The 
tentacula are comparatively long and slender; they fold after 
the characteristic manner of the tribe, and have the white 
inflated tips; they are united at the bases, on which, close 
together, are imbedded at the internal angles the conspicuous 
black eyes. The foot in slow march is short, broad and obtuse, 
but when the pace is accelerated, it becomes attenuated and 
