TROCHUS. 311 



vibracula, which issue from large white tubercles, clothed 

 with fimbriated white strands at their e'clges ; 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 columeUar 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. CINERARIUS, Linnaeus. 



T. cinerarius, Brit. Moll. ii. p. 516, pi. 65. f. 1,2,3; (animal) pi. D.D. 

 f. 1 & 1 a. 



Animal inhabiting a spiral, conical, ash-coloured, lineated 

 shell of 5-6 flattish volutions. The mantle is lax, but even 

 with the aperture. The head is a short, broad, wrinkled muzzle, 

 indented closely at the semicircular termination, ornamented 

 with a veil formed of two subcircular 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 

 lines; 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 fringed at the edge ; it tapers behind to a 



