Neotreme Brachiopod from California. 211 



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

 interior microscopicallj granulose, the margin flaring thinly 

 beyond the heavy submavginal encircling ridge ; pedestals 

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

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

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

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

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

 posterior angles of the shell ; space between the four adductor 

 scars roughly 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 with the median 

 prominence previously described ; anterior spaces 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 wrinides 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 fatlioms otF Santa Monica, Los Angeles County, 

 California {W. H. Grolisch), from tisherraen, summer 1918 ; 

 one specimen. 



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

 closely 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. anomala (Miiller), G. kermes (Humphrey 

 and Da Costa) f, and C. {Craniscus') japonica, A. Adams — 

 available for direct comparison. The tliickened and elevated 

 edge of the lower valve, tiie posterior apes, and the number 

 and conspicuousness of the pallial impressions are perhaps 

 the 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 North America, 

 the nearest records of this genus being those of C. hawaiiensis, 



* Proc. U.S. Nat. Mus. vol. Ivii. p. 272. 



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



14* 



