EULIMID^. 231 



VOLUSIA, A. Ad., 1861. Shell longitudinally ribbed. N. im- 

 bricata, Sowb. 



Stylifer, Brod. 



Syn. — Stylina, Gray. 



Distr. — 20 sp. Europe, West Indies, Polynesia, Philippines. 

 S. subulatus^ Brod. (Ixviii, 89). 



Shell hyaline, pellucid, thin, globular or subulate, smooth, 

 polished ; whorls numerous ; apex very sharp, sometimes bent, 

 nucleus sinistral; aperture suboval, angulated posteriorly, 

 rounded in front ; inner lip smooth, arcuated ; outer lip slightly 

 sinuous, thin, simple. No operculum. 



Tentacles slender, subulate, simple, eyes sessile at their outer 

 bases. Mantle enclosed. Foot' linguiform, forming an elon- 

 gated anterior lobe, rudimentary behind. 



These singular animals are found among the species of Echinus, 

 and in the skins of star-fishes, etc., burrowing beneath the sur- 

 face, and producing tumors, often of considerable size. When 

 removed and placed in water, they do not appear to possess 

 much locomotive power, but extend the tongue-shaped foot 

 and use it as an exploring organ. They were formerly believed 

 to be parasitic, but are now thought to receive their food in the 

 sea-water. Tongue unarmed. 



The foot of Stjdifer is much more produced anteriorly than 

 that of Eulima : the shells have more globose whorls, and are 

 generally thinner. 



CYTHNiA, Carpenter. Imbedded in star-fishes like Stylifer, from 

 which it is. distinguished by its normal nuclear whorls, and thin 

 concentric operculum. S. tumens, Carp. 3 sp. W. Coast of N. 

 America. 



PLiciFER, H. Ad. Imperforate, ovately subulate, not shining ; 

 spire styliform, nucleus sinistral, columella plicate; lip flexuous, 

 sinuate behind, aperture entire in front. Fovind by Mr. Hugh 

 Nevill on coral, at Ce3don ; in texture resembles the shell of Lep- 

 toconchus. F. Nevilli, H. Ad. (Ixviii, 90). Ceylon. 



Entoconoha, J. Miiller. 



Distr. — E. mirabilis, J. Miiller. 



Shell obovate, smooth ; spire short, ver}' obtuse, apex not 

 elevated, whorls rapidly increasing ; aperture transverse, semi- 

 lunar, angulated above, rounded below, width almost equaling 

 the height, margins disunited, the columellar margin straight. 

 Operculum non-spiral. 



Found parasitic on Synapta digitata, one of the Holothuriidse, 

 at Trieste. This is possibly the larval stage of some moUusk. 



Macrocheilus, Phillips. 



Etym. — Macros., large, and cheilos, lip. 



Syn. — Polyphemopsis, Portlock. Amaurella, A. Ad. Plecto- 

 stylus, Conrad. Macrochilina, Bayle, 1880. 



