438 PYRAMIDELLIDZ. 
a light, horny, thin, obliquely-striated operculum, seated on a 
simple lobe that is scarcely distinct from the upper part of the 
foot near its junction with the body. 
Habitat as in the two preceding species. This animal is 
now noticed for the first time. 
Cu. scaLaris, Philippi. 
Ch. scalaris, Brit. Moll. iii. p. 251, pl. 94. f.5; and (animal) pl. F.F. 
f. 5; and iv. pp. 274 & 277. 
Ch. rufescens, Brit. Moll. iii. p. 253, pl. 94. f. 1; and iv. p. 274. 
Animal subhyaline-white, sometimes of a pale red muddy- 
brown, aspersed with minute, opake, snow-white points, in- 
habiting a white plicated shell of seven or eight volutions, 
with transverse striz between the ribs, having the body 
marked with two or three narrow, spiral, light reddish-brown 
bands, and two on the penultimate volution; the apex is 
strongly reflexed on its next neighbour. Mantle even, except 
emitting a small cloven fold at the upper angle of the aper- 
ture. Rostrum deeply notched in front, with the segments 
gently arcuated. The tentacula are moderately long, strong, 
and divergent, and exhibit the usual folding auriform phases 
of their margins, but the varying inflations of the tips are 
less developed than im many other species. The eyes are 
black, not very close together, and fixed at the mternal bases 
of the tentacula, which do not entirely coalesce, beg divided 
by a distinct groove that is the continuation of one on the 
rostrum from the point where the cleft terminates. The foot 
is short, very shghtly auricled, and on the march does not 
extend much beyond the body volution, posteally declining to 
an obtuse termination, at a little distance from which is the 
almost simple upper lobe carrying the usual pyriform ellipti- 
cally-striated operculum. 
Habitat: shelly mud, in 10 fathoms water, six miles from 
the shore, off Teignmouth, Devon. 
This animal has scarcely been observed, and the only obser- 
vation as to colour does not quite accord with the live speci- 
mens I have examined. I am now inclined to think, contrary 
to my opimion expressed in the ‘Annals of Natural §listory,’ 
