PHILINE. 549 



P. PRUiNosA, Clark. 



Surface shagreened like hoar-frost, being decussated by most 

 crowded longitudinal and rather close-set spiral raised wrinkles ; 

 occasionally with a coloured zone. 



Plate CXIV. F. «g. 1,'2. 



BuU<ea pruinosa, Clark, Zool. Journ. vol. iii. p. 339. — Brit. Marine Conch. 



p. 137. 

 Fluli?ie „ LovEN, Index Moll. Scandinav. p. 9, animal. 



Bulla „ Jeffreys, Ann. Nat. Hist. vol. xix. p. 310. 



„ (r/iilme) pruinosa, A. Adams, Sow. Thesaur. Conch, vol. ii. p. 56"0, 

 pi. 125, f. 1G2. 



Colour is of rare occurrence in this genus, yet in this 

 small and delicate species a somewhat broad spiral band of 

 yellowish or chestnut-brown occasionally presents itself 

 upon the body, and relieves the otherwise uniform surface 

 of frosted snow white. The shape is subglobose, but de- 

 cidedly longer than it is broad ; it is very convex dorsally, 

 but is a little pinched in near the posterior end ; its crown 

 is somewhat rounded, and indented by a tolerably large 

 but shallow umbilicus. The hoar-frost appearance of its 

 entire exterior results from its decussation by raised longi- 

 tudinal and sjifral wrinkles, the former of which are rather 

 the more conspicuous ; both are so densely disposed that 

 the interstitial punctures, which are usually rather longer 

 than broad, are extremely minute. The aperture is capa- 

 cious, filling in the adult three-fifths, in the young two- 

 thirds at least, of the ventral area ; it is rather broadly 

 ficiform, being abruptly contracted by the swell of the body 

 above, well rounded and expanded anteriorly. The outer 

 lip is greatly arched, and is scarcely, if at all, produced 

 posteriorly above the crown. The incurved pillar lip is 

 decidedly produced, and is raised a little at the edge, 



