Neotreme B rack iopod from CaUfornia. 211 



but, so far as can be seen, without evident radial striation ; 

 interior microscopically granulose, the margin flaring thinly 

 beyond the heavy subraargiual encircling ridge ; pedestals 

 of anterior adductor muscles strongly raised, far apart, and in 

 no way coalescent, but connected by a low ridge, with a small, 

 nipple-like prominence lying between and in front of them at 

 nearly the centre of the valve ; posterior adductor .scars large, 

 swollen, rounded-oval in outline, placed well inside tiie 

 posterior angles of the shell; space between the four adductor 

 scars rouglily diamond-shaped, deep at the centre, and bounded 

 by four almost coalescent curved ridges, the two anterior 

 much more strongly inbowed than the two posterior ; a pair 

 of small rounded muscle-scars or pedestals are sheltered in 

 the angle between the two anterior ridges and those con- 

 necting the anterior adductor pedestals witli the median 

 prominence previously described ; anterior 8i)aces conspicu- 

 ously marked by seven or eight pallial (sinus?) impressions 

 on each side. 



Lower valve flattish, shallow, attached to the substratum 

 by its entire lower surface, with the exception of a narrow, 

 sharply ascending, marginal area ; interior with a strong 

 submarginal thickening, which shows numerous, obscure, 

 fine, radial wrinkles down its inner slope. 



Measurements. — Longitude 13'5 mm., diameter 16'2, 

 height 4-4. 



Type. — Cat. no. 4530, Berry Collection. 



Type-locality. — From rock at base of a siliceous sponge 

 taken in 100 fathoms off Santa Monica, Los Angeles County, 

 California [W. H. Golisch), from fishermen, summer 1918 ; 

 one specimen. 



Remarks. — This fine Crania does not seem to be veiy 

 closttiy allied to any of the previously described species of 

 the group, unless it be the lately published C. philippinensis 

 of Dall*, although I have had specimens of only three of the 

 older species — C. anom^ila (Miiller), G. kennes (Huuiplirey 

 and Da Costa) f, and C. (CranisciisJ japonicr, A. Adams — 

 available for direct comparison. The thickened and elevated 

 edge of the lower valve, the posterior apex, and the number 

 and conspicuonsnesa of the pallial impressions are perhaps 

 tlie most prominent of the peculiar features. 



This is the first Crania to be reported either from Cali- 

 fornia or elsewhere along the western shore of Xorth Anericji, 

 the nearest records of this oenus bein<i' those of C. hawaiiensis. 



Proc. U.S. Nat. Mas. vol. Ivii. p. 272. 



= C. turbinata (Desliayes), teste Davidson, MoDog. Rec. Brach. p. 188. 



14* 



