NO. 1201. ILLUSTRATION!S OF AMERICAN SHELLS— DALL. 5()1 
CETOCONCHA SCAPHA, new species. 
Shell small, thin, elonoate, suhequilateral, evenly rounded in front, 
arcuate below, slightly attenuated and obliquely subtruncate behind; 
valves moderately convex, subtranslucent white with a pale-yellow 
very thin periostracum, with close, very fine radial lines of almost 
microscopic granulations; beaks plump, but not elevated, ligament 
short, brown, situated in the anterior sixth of a narrow escutcheon, 
bounded by a low keel; anterior hinge line slightly arched with a sin- 
gle minute obsolete right cardinal tubercle; posterior hinge line 
straight, the margin subangulate at its extremity behind; ligamentary 
nymph inconspicuous; interior of the valv^es polished, pallial line sim- 
ple and with the muscular impressions, hardly visible; margins entire, 
shell slightl}^ gaping behind; soft parts as in C. elongata Dall; Ion. 
12.6, alt. 8.2; diam. 6.0 mm. 
Dredged by the U. S. Fish Conmiissiou steamer Albatross in the 
Gulf of Panama, off Cocos Island in 100 fathoms, mud, at station 3367, 
bottom temperature 57°. 1 F. U.S.N.M., 109026. 
This species resembles most nearly C elongata Dall, from 200 fath- 
oms in the Straits of Florida, a species which is larger and propor- 
tionately higher. It is interesting as being from the most shallow 
water in which the genus is yet known to occur, most of the speci- 
mens having come from great depths. 
BRACHIOPODA. 
TEREBRATALIA HEMPHILLI, new species. 
Plate XL, figs. 8, 10. 
Pliocene of Santa Barbara, between one-half and 1 mile inland from 
the sea, in Arroyo Buero on the Hope ranch; collected by J. Howard 
Wilson. U.S.N. M., 108495. 
Shell substantially as figured, thin, rather compressed or not very 
convex; transverse, valves with low, flattish, ill-defined radial riblets, 
which, except near the beaks, become obsolete toward the middle of 
the valves. Mesial flexure shallow, broad mesially concave. Area 
narrow, ill defined; foramen narrow, high, incomplete below; puncta- 
tion fine and profuse. Alt. 30.0, lat. 33.0, diam. 12.0 mm. 
Owing to the condition of the shell, which is fidl of consolidated 
matrix, the interior could not be examined, but the characteristics all 
point toward the species being one of a group abundant on the west 
coast in a recent state and containing such species as T. transversa 
Sowerby and T. ohsoleta -D^iW. A specimen supposed to be of the same 
species has been found in the Pliocene of San Pedro, but I have not 
had an opportunity to make a critical comparative study of the two. 
Proc. N. M. vol. xxiv— 01 36 
