STILIFER. 195 



Stilifer Turto'ni"^,, Broderip. 



Thasianella stylifera, Turton in Zool. Journ. ii. p. 367, t. xiii. f. 11. Sti- 

 lifer Turtoni, Brod. in Proc. Zool. Soc. 1832, p. 61. Sfylifer Turtow, 

 F. & H. iii. p. 226, pi. xc. f. 8, 9, and (animal) pi. 00. f. 5. 



Body white and delicately stippled ; cilia innumerable, ar- 

 ranged in scale-like bundles, and in constant action : mantle 

 thickened at its edges ; canal terminating in an oval or roundish 

 hole: head-lohes{yv\)iQ\i perhaps may be expansions of the foot, as 

 in Nafica) rounded and flattened, nearly transparent, one on 

 each side, and placed a little below the mouth : snout rather long 

 when extended, but usually folded or curling inwards, like an 

 elephant's trunk, slightly bilobed at the extremity ; it lies 

 between the tentacles and the foot : tentacles club-shaped, 

 somewhat compressed, thick, and rather long, sometimes en- 

 larged towards the tips (which are blunt), widely diverging, 

 but united at their bases ; they are more or less strangulated 

 or constricted, usually at about one-fourth of the distance 

 from their bases ; the cilia with which they are covered seem 

 to produce a circulating current : eyes exceedingly small, placed 

 at some distance behind the tentacles : foot elongated, in front 

 bulbous and forming a creeping disk, behind somewhat tubu- 

 lar and tapering to a fine point; the sole is slit backwards 

 down the middle for more than three-fourths of its length, the 

 opening or commencement of the slit being of an oval shape : 

 male oi'(jan spiked and resembhng an auxiliary tentacle. 



Shell globosely conical or oval, with an obliquely rounded 

 base, thin, semitransparent, and lustrous: sculpture, micro- 

 scopical and flexuous lines of growth, and a few extremely 

 slight and indistinct spiral stride : colour light reddish-brown 

 or amber, which appears to be sujlerficial, as it soon fades and 

 becomes whitish : spire divided into two parts, the first-formed 

 part or nucleus consisting of a minute and very short cylinder, 

 which is erect, although twisted slantingly in diff'erent direc- 

 tions ; the o^her part or main body of the spire is short and 

 abruptly separated from the nucleus : ivliorls 3-4 (besides 2-3 

 which compose the stiliform apex), very tumid, and rapidly 

 enlarging ; the last is enormous in proportion to the others : 

 suture rather slight, but distinct : mouth more round than oval, 

 not much expanded at the base: outer lip thin, inflected just 

 below the periphery, whence it slopes obliquely downwards : 

 inner lip consisting of an almost invisible film on the upper 



* Named after Dr. Turton. 



K 2 



