312 TROCHID A. 
spire and deep sutures ; whorls angulated at the periphery, where 
they are sulcated. 4sp. RedSea. 7. fanulum, Gmel. (1xxxi, 81). 
LEPTOTHYRA, Carp. (Leptonyx, Carp. and Ads. Homalopoma, 
Carp.) Shell small, turbinated, thick, not umbilicated; aperture 
circular, slightly angulated anteriorly. The type of this group 
is the California shell identified as conspecific with the Mediter- 
ranean species Turbo sanguineus, Linn.; the latter, however, 
has a calcareous operculum, and is therefore a true Turbo, whilst 
the operculum of this is corneous, multispiral. 
CALLIOTROCHUS, Fischer. Uncharacterized. 7. phasianellus, 
Desh. 
ZIZYPHINUS, Gray. (Calliostoma, Swains. Conulus, Nardo.) 
Shell trochiform, conical, not umbilicated ; last whorl angulated 
and usually ribbed at the periphery; aperture quadrangular ; 
columella simple, oblique, often ending in a tooth in front. 28 
sp. Universally distributed. 7. zizyphinus, Linn. (1xxxi, 
48, 49). 
EUTROCHUS, Ad. Zizyphinus-like shells, but umbilicated, the 
umbilicus encircled by a carina. 3 sp. West Indies, Indian 
Ocean, Australia. 7. (Hutrochus) jujubinus, Linn. (1xxxi, 82). 
rurcicA,H.and A.Adams. Shell conoidal, thin, subdiaphanous, 
imperforate, ornamented with revolving granulated ribs; suban- 
gulated at the periphery ; suture channeled; columella tortuous, 
pointed in front, in the middle spreading into a lamina, with one 
or two teeth on its edge. TZ. moniliferus, Ads. (1xxxi, 51 . 
TROCHODON, Neeley, 1861. Resembling Zizyphinus, thin, 
having on the columella two prominent teeth, = Turcica (7). 7. 
cancellatus. Cambridge Greensand. 
PTYCHOSTYLUS, Gabb. According to the characteristics given 
by Gabb, apparently does not differ essentially from Turcica. 
The columella is solid, with two oblique folds. P. caffea, from 
California, is quoted as the type. 
LISCHKEIA, Fischer. Uncharacterized. 7. moniliferus, Lam. 
Japan. 
ODONTOTROCHUS, Fischer. Uncharacterized. 7. chlorostomus, 
Menke. Australia. 
THALOTIA, Gray. Shell ovate-turriculated, rather thick, not 
umbilicated ; whorls flattened, with revolving ribs, which are 
sometimes granulated; aperture subrotund; columella tuber- 
culate, truncate in front; outer lip rather thick, crenulated 
within. 8 sp. Australia, Indian Ocean. TY. conicus, Gray 
(ixxxi, 52). 
ELENCHUS, Humphrey. Shell elevated conoidal, not umbili- 
cated, spire sharp; whorls rather flat, smooth, polished, usually 
with distant revolving incised lines; aperture suboval; colu- 
mella with a tooth-like projection in the middle; outer lip 
thickened within. 6 sp. Australia. Brilliantly colored shells, 
