MOLLUSCA OF PORTO RICO. 
497 
Crassatellites guadelupensis d’Orbigny. 
Crassatella guadelupensis d’Orbigny, Moll. Cubana, 11 , p. 289, pi. xxvii, figs. 24-26, 1846. 
Shell small, somewhat inequilateral, irregularly triangular, rather solid, compressed, with sharp, 
high beaks, which are curved slightly backward over a long escutcheon; lunule long and shallow; 
surface with a few concentric, raised laminse, left valve with two cardinals and a posterior lateral with 
a deep groove above it; right valve with two cardinals and a long anterior lateral with a deep groove 
above it. Color whitish or brown, sometimes variegated. 
Length, 4; height, 3; diameter, 1.5 mm. 
Mayaguez, Porto Rico, four worn valves. 
The posterior dorsal side is longer than the anterior dorsal side, and its outline is incurved. 
There are eight or ten concentric lamellae on adult shells. 
Crassatellites martinieensis d’Orbigny. 
Crassatella martinieensis d’Orbigny, Molt. Cubana, ii, p. 288, pi. xxvii, figs. 21-23, 1846. 
Shell very small, with high sharp beaks, the anterior and posterior slopes straight from the beaks, 
the two standing at a right angle with each other, compressed, the basal line from the lower end of 
the anterior and posterior slopes well rounded; surface with eight to ten raised, sharp, concentric 
lamellae, sometimes ornamented with a few feeble brown rays; hinge much as in C. guadelupensis. 
Color generally whitish. 
Length, 2.25; height, 2; diameter, 1 mm. 
Mayaguez, a number of valves. 
In C. guadelupensis the outline of the anterior dorsal truncation is a little convex and that of the 
posterior dorsal truncation is concave. In C. martinieensis both outlines are straight, and the shell is 
more nearly equilateral. 
Order ANOMALODESMACEA. 
Superfamily POROMYACEA. 
Family CUSPIDARIIDtE. 
Genus CTJSPIDARIA Nardo, 1840. 
Shell small, corbuliform, rostrate, smooth or sculptured, the radial sculpture, if any, predominant. 
Gills obsolete, and their remnants seated on a muscular septum between the perivisceral and anal 
chambers. 
Subgenus Cuspid aria s. s. 
Shell smooth. 
Cuspidaria obesa Loven. 
Nexra obesa Loven, Ind. Moll. Scand., p. 48, 1846; G. O. Sars, Moll. Reg. Aret. Norveg. , p. 86, pi. 6, fig. 4 a-c. 
Mayaguez Harbor, Porto Rico, at station 6062, in 30 fathoms, sand; also at Barbados, 100 fathoms, 
and at many localities in the North Atlantic and arctic seas, commonly in deep water. The presence 
of this shell and a number of others in comparatively shallow water of high temperature (75.8° F. ) is 
one of the surprises afforded by this collection. 
Subgenus Cardiomya A. Adams. 
Shell with radial sculpture. 
Cuspidaria perrostrata Hall. 
Cuspidaria perrostrata Dali, Blake Report, Biv.,p. 296, pi. ii, figs. 3a, 36,1881. 
Mayaguez Harbor, Porto Rico, in 30 fathoms, at station 6062. 
Cuspidaria costellata Deshayes. 
Corbula costellata Deshayes, Explor. Sci. Mor6e, G<5ol.,p. 86, pi. vii, figs. 1-3,1837. 
Sphena alternata d’Orbigny, Moll. Cubana, ii, p. 286, pi. xxvii, figs. 17-20, 1845. 
With the last; also northward to North Carolina, in the Mediterranean, etc. 
. . F. C. B. 1900—32 
