PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 325 
Acus dislocatus Say. 
Cedar Keys, between tides in the sand, abundant. These are rather 
darker and smaller than more northern ones. 
Acus protextus Conrad. 
Sarasota Bay, onthe mud flats and in the sand between tides; those 
from the former locality differ a little in color from those of the sandy 
beaches ; also rare on mud flats at Cedar Keys. The sculpture of this 
species varies in strength with its station. It was described by Conrad 
as a Cerithium ! 
Wassa ambigua Mor. 
Key West, rare on the beach. A common West Indian form. 
Ilyanassa obsoleta Say. 
Saint Augustine, on mud between tides, abundant. 
Phos intricatus n.s. (Plate X, Fig. 9.) 
Shell with seven whorls, pale waxen, with a yellowish-brown epider- 
mis, strongly sculptured surface, turreted spire, solid texture, and singie 
oval varix. Nucleus smooth, involved like Neritula ; next two whorls 
strongly cancellated, with two especially prominent spiral lines; later 
whorlssubtabulate, moderately rounded,sculptured spirally, with strong, 
rounded, even threads, with single intercalary smaller threads in the 
interspaces ; the third or fourth primary thread, counting forward from 
the suture, is stronger than the others, and forms the margin of the tab- 
ulation; anteriorly the primary threads become more distant and the 
interspaces deeper; counting forward from the marginal thread above 
mentioned, there are about fourteen of the primary threads on the front 
of the last whorl, all of which show traces of nodulation at the intersec- 
tions, and the anterior six of which are strongly nodulous, though the 
transverse sculpture is hardly visible in the interspaces; the tranverse 
sculpture is composed of about fourteen rounded ribs, which cross the 
whorls, butare overrun by the spiral threads ; also of rather well-marked 
lines of growth; the aperture is marked by a strong rounded varix, 
over which the sculpture runs, the shell being apparently contracted 
before and behind the varix; aperture rather small, within polished 
white, with five or six well-marked lire inside the outer lip and the 
usual tooth-like callus on the body near the suture; canal short, slightly 
‘recurved; suture distinct ; operculum brownish, thin, resembling that 
of Fusus. Lon. of shell, 13.2; of last whorl, 8.7; of aperture, 6.0 ; max. 
lat. of shell, 6.2; of aperture, 2.5™". Habitat, Key West; abundant 
nuder stones between tides. 
It is possible that this is “Ocinebra cyclostoma Sby.” of Melvill’s list, 
a species I do not know, but it is at all events a Phos and not cvyclosto- 
mate. It is distinct from any of the species of Phos ascribed to the 
West Indies of which figures are accessible, and from any of the species 
