106 MURICIDA, 
long; canal very short, wide; outer lip thickened and dentate 
within. Varices nearly obsolete. M. miliaris, Gmel. (xlili, 9). 
OCINEBRA, Leach. (Muricopsis and Corallinia, Bueq. and 
Dautz.) Spire elevated; canal more or less closed; varices 
foliated, sometimes spinose. JZ. erinaceus, Linn. (xliii, 10). 
This group, as well as Muricidea, is made by Messrs. Adams 
an omnium gatherum, including true Murices, purpuroid Murices, 
Purpure, Fuside, etc. Muricidea as defined by them has no 
really distinctive characters from Ocinebra, and Swainson 
included species of Trophon, Triton, etc. I have suppressed 
Muricidea, and retained Ocinebra for a group of small Murices 
with numerous varices and purpuroid operculum ; the species 
having muricoid operculum should be relegated to Phyllonotus, 
from which they do not differ. 
PTEROHYTUS, Conrad. Not characterized. The type has lamellar 
varices like Cerostoma foliatum, but more numerous than in that 
group, and the outer lip has a tooth. I think it may be safely 
relegated to Phyllonotus, Swains. J. umbrifer, Conr. (xliii, 11). 
Miocene ; Virginia. 
URosALPINX, Stimpson. 
Syn.—Adamsia, Dunker. Agnewia, T.-Woods. 
Distr.—20 recent species. Atlantic Coast of America, Cape 
Horn, Cape of Good Hope, New Zealand, etc. U. Floridana, 
Conr. (xliii, 12). 
Fusiform. No proper varices, which are replaced by longi- 
tudinal ribs. 
Shell elongated oval, or short fusiform, longitudinally ribbed 
or undulated and spirally striated ; aperture with a short canal ; 
outer lip dentate and lirate within. Operculum somewhat like 
that of Purpura, semicordate, with the nucleus at the outer edge 
a little below the middle. Lingual dentition nearly like that of 
Trophon. 
It differs from Trophon in its operculum, and from Ocinebra 
in its smoother shell, want of distinct varices, and open canal. 
Urosalping cinerea occurs upon the Atlantic coast of the 
United States from Maine to Florida. The animal is small, foot 
scarcely covering the aperture, very little dilated at the front 
angles, cream-colored, margined with lemon-color beneath, punc- 
tured with light drab above; siphon merely surpassing the tip 
of the canal; head scarcely protruded; tentacula nearly united 
at origin; eyes black, at the outer upper third of tentacula, 
which third is a mere filament, contractile. Motions sluggish. 
Littoral. The eggs are contained in small transparent mem- 
branous parchment-like vases, each of which is attached by an 
expanded foot to some solid substance, usually the under surface 
of an overhanging rock, a little above low-tide mark. Each 
female deposits from ten or twelve to more than a hundred of 
