174 CLASS III. GASTEROPODA. ORDER VII. PECTINIBRANCHIATA. 
STYLIFER, Broderip. 
Testa hyalina, pellucida; vel globosa, anfractibus paucis, spira brevis- 
sima; vel elongata, anfractibus plurimis, spira turriculata; apice 
elato, obtuso, interdum irregulariter contorto ; apertura subovata, 
superné acuta; labro simplici, tenuissimo, leviter sinuato. 
The genus Stylifer was instituted by Broderip for the reception of the 
little parasitical mollusk just described, upon the arrival of some speci- 
mens collected by Mr. Cuming imbedded in the soft parts of a star-fish, 
admirably showing it in situ. The shell of the Styliferi, of which we have 
two distinct formations, has been long known to naturalists. The first 
mention we find made of it is by Chemnitz, who has described and figured 
a turriculated species in his ‘ Conchology,’ vol. xi. p 286. pl. 210. f. 2084 
and 2085, under the name of Helix corallina, though he appears very un- 
determined as to whether it might be a marine ora land shell. A globose 
species found attached to the spines of an Echinus was then described by 
Turton under the title of Phasianella stylifera, so that this author was as 
ignorant of the true nature and habits of its animal inhabitant as Chem- 
nitz: Fleming referred it to the genus Velutina; but, in evident doubt of 
the propriety of this arrangement, he at the same time suggested that a 
new one might be established for its reception with the name of Stylina. 
The shell of Stylifer may be described as being hyaline, pellucid, and 
either globose, of few whorls, with a very short spire, or elongated, of 
many whorls, with a turriculated spire, the apex in both forms being 
curiously elevated, obtuse, and sometimes irregularly bent or twisted : 
the aperture is nearly ovate, but acute at the upper part; the lip is 
simple, very thin, and slightly sinuated. 
Ezamples. 
Pl. CCXXV. Fig. 1. 
STYLIFER SUBULATUS, Broderip. Sowerby, Genera of Shells, No. 38. 
