TROCHUS. 311 
vibracula, which issue from large white tubercles, clothed 
with fimbriated white strands at their edges; it also carries, 
nearly at its termination, an orbicular corneous operculum of 
only 5-7 spiral turns. The neck-lobes are large and suboval, 
the columellar one having two or three short, white, pendent 
strips ; that of the right side is plain; they are white, suffused 
with pale greenish-yellow. 
This animal, which is common everywhere, is perhaps the 
most splendid and gorgeous of the British Gasteropoda, equal- 
ling, if not surpassing in beauty, its lovely relative the Pha- 
sianella pullus. The colours vary much, and of course create 
discrepancies in the descriptions of authors. The animal is 
free in showing its magnificent appendages. 
T. ciIneRARIUS, Linnzus. 
T. cinerarius, Brit. Moll. ii. p. 516, pl. 65. f. 1, 2,3; (animal) pl. D.D. 
fo 8c Aa. 
Animal inhabiting a spiral, conical, ash-coloured, lmeated 
shell of 5-6 flattish volutions. The mantle is lax, but even 
with the aperture. The head isa short, broad, wrinkled muzzle, 
indented closely at the semicircular termination, ornamented 
with a veil formed of two subcireular lobes, almost coalescing, 
with crenated margins, which, when erected, have the appear- 
ance of an awning or semi-pavilion hanging over the disk of 
the muzzle. The tentacula are long, conical, tapering, subu- 
late, white, and barred or ringed with dark cloud-coloured 
Imes; the black eyes are placed externally, on moderately 
long, strong, distinct pedicles. The buccal aperture is a 
vertical fissure beneath the head-disk, and the muzzle contains 
the usual masticatory apparatus. The neck behind is pale 
yellow, anteriorly dusky, and the head is barred with close 
irregular lines and blotches. The neck-lappets are suboval 
and well developed ; that on the pillar side has three or four 
short, white, thick, subcylindrical pendent fillets springing 
from the lower margin ; the other is plain. The foot is rather 
a long, large, oval disk, yellow beneath, brindled above with 
dark-coloured, closely packed, undated lines and irregular 
blotches, and finely frmged at the edge ; it tapers behind to a 
