EULIMIDA. 931 
vonusia, A. Ad.,- 1861. Shell longitudinally ribbed. N. im- 
bricata, Sowb. 
STyLirer, Brod. 
Syn.—Stylina, Gray. 
Distr.—20 sp. Europe, West Indies, Polynesia, Philippines. 
S. subulatus, Brod. (1xviii, 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, ete., 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 Stylifer 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. ¢umens, Carp. 3 sp. W. Coast of N. 
America. 
pLicirER, H. Ad. Imperforate, ovately subulate, not shining ; 
spire styliform, nucleus sinistral, columella plicate; lip flexuous, 
sinuate behind, aperture entire in front. Found by Mr. Hugh 
Nevill on coral, at Ceylon; in texture resembles the shell of Lep- 
toconchus. P. Nevilli, H. Ad. (Ixviii, 90). Ceylon. 
Enroconcna, J. Muller. 
Distr.—EH. mirabilis, J. Muller. 
Shell obovate, smooth; spire short, very 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 Holothuriide, 
at Trieste. This is possibly the larval stage of some mollusk. 
Macrocuetuus, Phillips, 
Etym.— Macros, large, and cheilos, lip. 
Syn.—Polyphemopsis, Portlock. Amaurella, A. Ad. Plecto- 
stylus, Conrad. Macrochilina, Bayle, 1880. 
