136 



TERTIARY AND QUATERNARY PECTENS OF CALIFORNIA. 



15(>rkeley, " Janira (/oifafa Shy, San Pedro, Quaternary." The specimen 

 undoubtedly came from tlie Pliocene of Deadman Island, instead of from the 

 Quaternary. 



J^. e.i-ciff/ifus is known only as living, and so far has been noted only from 

 the Gulf of California, where it is a very common species in some localities. 



Living. Gulf of California (Sowcrby; Valenciennes; Carpenter; Button, and 

 others). 



^ Pectex (Chla.mys) hastatus Sowerby var. albidus Dall n. var. 



PI. LII, tigs. L' and 2-1. 



1904. Pecten (Chkimi/ii) heririus var. (tlhidus Dall, MS. 



Description. — Shell of the same shape and general appearance as /'. var. 

 hericivs, but smaller when adult, being only aljout 4.") millimeters in altitud(». The 

 •sculpture on the right valve consists of numerous elevated, narrow, thread-like, 

 imbricated riblets, which have the appearance of boimg grouped together in three or 

 more unequal, equidistant, more or less convex fa.sciculi; the interspaces between 

 the fasciculi are ornamented by riblets of equal prominence to those forming the 

 fasciculi; anterior ear with about seven equal, prominently imbricated radials; 

 posterior ear short and with radial and imbricating sculpture; byssal notch cjuite 

 prominent. Left valve similar to right, but with the fasciculi corresponding to the 

 interspaces of the right valve, and consequently much nari'ower than the fasciculi 

 of that valve. Color, white to ver^- light pink. 



Dimensions. — Alt. 45 nmi.; long. 40 mm.; huige line 19 mm.; diameter 14 nun. 



This variety is characterized by its l)road, low fasciculi and light color. Type, 

 No. 150207, U. S. Nat. Mus., from U. S. F. C. Sta. 38i;-S. lliuliuk Harbor, Unalaska, 

 68 fathoms, 42.7° bottom temperature. 



Living. U. S. F. C. Stas. 3oll, 3313, 331.S, 3321, Bei-ing Sea, in 54 to 85 fathom.s 

 (U. S. Fish Commission). 



Pecten (^Equipecten) palmeri Dall. 



PI. L, figs. 2, '2a, ;5, and 3f(. 

 1897. Pecten palmeri Dall, Nautilus, veil. 11, No. S, Dec, 1S97. p. S.5. 



The original description is as follows: 



Description. — ^ Shell thin, orbicular, compressed, equilateral, white to yellowish 

 brown, with concentric or zig-zag narrow bands or flecks of dark rose color; 15 

 strong ribs rounded in the young, mesially keeled and longitudinally threaded in the 



