158 PROCEEDINGS OF THE NATIONAL MUSEUM. — VOL. 37. 
CHIONE ASPERRIMA Sowerby. 
Venus asperrima SowERBY, Proc. Zool. Soc. of London for 1835, p. 42; Thes. 
Conch. Venus, 1853, pl. 155, figs. 57-58. 
From the shell heaps at Huaquilla and Matapalo. Common in some localities, 
especially shelly beaches. ‘‘Concha tabaco” of the fishermen, who do not like it, 
saying it has the flavor of tobacco. 
Found associated with the Anomalocardia. 
Mstribution.— Gulf of California southward to the Lobos Islands, 
Peru. 
Shell rounded triangular, moderately tumid, whitish or grayish, 
with fine, rough, reticulate sculpture; in favorable localities with 
brown or livid varied painting on a lighter ground; lunule ovate, 
depressed, whitish. 
This shell is recognizable by its rasp-like surface and long anterior 
cardinal tooth. 
CHIONE COMPTA Broderip. 
Venus compta BropeErtp, Proc. Zool. Soc. of London, for 1835, p. 43.—SowERBy, 
Thes. Conch. Venus, 1853, pl. 154, figs. 32-34. 
Beach of Sechura Bay, near Matacaballa. 
Mstribution—Gulf of California and southward to the Galapagos 
Islands and Sechura Bay, Peru. 
Shell closely resembling Chione cancellata of the Atlantic coast, 
but flatter, more spread at the sides where the radiating threads are 
divergent, and the concentric sculpture is more laminar and less 
reflected; the latter is apt to be crowded, ventrally, in senile exam- 
ples. The shell is white, rounded trigonal, solid, and heavy, with 
radiating rounded threads and concentric more or less distant 
lamellae. The internal margins are crenulate, and the shell rarely 
exceeds 30 mm. in length. It is too small and not sufficiently abun- 
dant to have an economic value. 
ANOMALOCARDIA SUBRUGOSA Sowerby. 
Plate 26, fig. 3. 
Venus subrugosa SOWERBY, Genera of Shells, 1834, fig. 2. 
Conchas de los bajos. Near Capon, at the oyster beds of Matapalo, there is along 
the border of the mangrove swamp a shelly bank about 25 meters wide. From this 
thousands of these shells may be taken in a short time. They are esteemed as food 
by the fishermen. They were also taken at Lancha de Fierro, at the mouth of the 
Tumbes River, and in the tidal lagoon La Boca Grande, at Tumbes; and the dead 
shells occur in the shell heaps at Huaquilla, on the Ecuador border. 
Distribution —F rom the Gulf of California to Valparaiso, Chile. 
Shell ovate, subcordate, very tumid, thick and solid, the ventral 
edge much arcuated; color pale, with three or four dark rays; a few 
large, coarse, smooth, rounded and concentric ribs which become 
obsolete on the anterior slope and toward the ventral edge; lunule 
cordate, limited by an impressed line; inner margins crenated; 
length about 35 mm. 
