MOLLUSCA. 47 



Beechey's Voyage, p. 138, sub nom. Stylina) that what has been considered the enlarged 

 mantle is in reality the foot. The following observation is from the living animal. 



The Stylifer Astericola (PI. XVII. Fig. 5), found living in the body of a star-fish 

 (dsterias), on the coast of Borneo, has two elongate, subulate tentacles, with the eyes 

 sessile near the outer side of their base, and a small rounded head. The mantle is entirely 

 enclosed and covered by the thin shell, and the foot is narrow, slender, very much produced 

 beyond the head in front, and scarcely extended at all behind. 



For the anatomy by Professor Owen, see K-eeve's Conch. Systematica, vol. ii. p. 174. 



7. TURBINACEA. 

 32. TURRITELLA, Lamarck. 



The animal of Turritella is rather small for the size of the aperture of the shell ; the 

 head is small and oblong ; the tentacles short and subulate, with the eyes on the middle of 

 their outer side. The foot is moderate and slightly notched in front. Operculum orbicular, 

 homy, many-whoiied, with an epidermic fimbriated margin. 



This niollusk is very shy and sensitive ; retiring quickly within its shell on the slightest 

 alarm. It is slow-moving and inactive. It seems to balance its unwieldy shell, though of 

 comparatively light structure, with some degree of difficulty, and occasionally will remain 

 fixed for hours in one spot. The fringed veil over the head is not usually visible, nor is the 

 head of the animal often seen, so excessively timid is its disposition. 



1. Tureitella bicolor. PI. XII. Kg. 1. Turr. testa acuminato-turrita, anfractibus decem ad 

 duodecim, convexis, subtilissime quadriliratis et striatis, liris distantibus, obscure granulatis ; aureo-lutea, 

 suturis lirisque nigrescente-purpureis. 



Hab. China Sea. 



In addition to the above characters, there are a few puckered obliquely-wrinkled striae 

 next the sutures. 



2. TufMUTEiXA congelata. PI. XII. Fig. 2. Turr. testa acute subulata, basi angulata, anfractibus 

 sedecira, convexo-planis, laevibus, obscure triliratis, liris tenuibus, distantibus ; pellucido-alba. 



Hab. China Sea. 



Transparent at the base ; towards the apex more opake. 



3. Tukkitella conspeesa. PL XII. Pig. 3. Turr. testa turrita, anfractibus duodecim, superne 

 declivibus, deinde tumidis, et conspicue bicariuatis et liratis ; lutescente-alba, fuscescente longitudinaliter 

 undulata et punctata. 



Hab. China Sea. 



Delicately mottled throughout with irregular light-brown waved streaks, forming dots 

 here and there next the sutures. 



