MOLLUSCA OF PORTO RICO. 
399 
Subgenus Latirus s. s. 
Shell fusiform, turricuiated, subumbilicated; spire produced; whorls nodulous. 
Latirus brevicaudatus Reeve. 
Turbinella brevicauclata Reeve, Conch. Icon., iv, pi. x, fig. 50, 1847. 
Shell with about ten somewhat rounded whorls; spire elevated; whorls with about eight strong, 
rounded, nodulous, longitudinal ribs; surface covered with numerous, sharp, revolving ridges, and in 
the interstices of these there are smaller revolving ridges and lira? ; aperture round-elliptic, the 
outer lip lirate within; canal rather short, recurved; columella with three or four plaits. Color reddish 
brown ; revolving ridges darker. 
Length, 40; diameter, 18 mm. 
Off Point Melones, Porto Rico, one young shell. 
Latirus infundibulum Gmelin. 
Mnrcx infundibulum Gmelin, Syst. Nat., p. 3554, 179'?. 
Turbinella infundibulum Reeve, Conch. Icon., iv, pi. i, lig. 3, 1847. 
Shell elongate-fusiform, with about eleven whorls; spire elevated; whorls somewhat rounded, 
sculptured, with six or seven strong, nodulous, rounded, longitudinal ridges. On the upper whorls 
there are four or five strong, revolving ridges, and rarely a revolving thread in the interstices. Aper- 
ture long, ovate; outer lip strongly lirate within; parietal wall heavily callous, the callus sometimes 
being raised into a sharp lip; columellar plaits four; canal long, narrow. At the base of the shell 
there is a false umbilicus. Color reddish brown, the revolving ridges darker. 
Length, 65; diameter, 23 mm. 
Mayaguez Harbor; Porto Rico; off Vieques. 
Family BUCCINIILE. 
Genus PISANIA Bivona, 1852. 
Shell oblong, smooth or spirally striated; spire prominent; outer lip thickened and crenated 
within; canal short; operculum ovate, nucleus apical. 
Pisania pusio Linnaeus. 
Mur ex pusio Linn, Syst. Nat., ed. x, p. 754, 1758. 
Buccinum pusio Reeve, Conch. Icon., iii, pi. vi, fig. 43, 1840. 
Shell somewhat elongated, having about ten or eleven slightly convex whorls; growth lines 
strong and almost riblike on the upper whorls, the first one and one-half being nearly smooth, the 
next four or live nodulous, and the next one and a half reticulated. Below this the sculpture fades 
out until the lower whorls are smooth. The last whorl is a little concave below the suture. Aperture 
fully half the length of the shell; outer lip thickened and somewhat varicose, lirate within, toothed 
on its outer edge; canal short, truncated; inner lip callous, the callus rising into a lip. There are 
frequently a few denticles on the base of the columella. On the parietal wall at the upper end of 
the aperture there are two white plaits, and above this there is a canal. Color purplish brown, with 
narrow, revolving, darker bands, which are articulated with arrowheaded white spots. 
Length, 45; diameter, 20 mm. 
Caballo Blanco Reef, Vieques. 
Genus TRITONIDEA Swainson, 1840 
.Shell bucciniform, generally cancellated, having a thick epidermis; spire pointed; aperture ellip- 
tical, canaliculate above; outer lip thickened and varicose, lirate within; columella concave; parietal 
wall with a tooth above. Operculum unguiculate. 
Tritonidea tincta Conrad. 
Pallia Hilda Conrad, Proc. Acad. Nat. Sci. Phila. 1846, p. 25, pi. I, fig. 9, 1846. 
Shell with a conical spire, the whorls but slightly convex, with low rounded longitudinal ribs, 
which are crossed by revolving riblets. Between these riblets there are revolving line, and there is a 
