NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT 65 



walls and internal structures, and prominent intercamarophorial plate. 

 Its larger size and presence of the intercamarophorial plate distinguish 

 it from the externally similar Pennsylvanian genus Psilocamara 

 Cooper. The high Gothic arch-shaped fold distinguishes it from smooth 

 or weakly costate species of Coledium n. gen., as does its more tightly 

 curved pedicle beak and thicker shell walls. Its weak or absent costae, 

 high vaulted fold, presence of an intercamarophorial plate and less 

 strongly globose shape distinguish it from Cyrolexis n. gen which also 

 has thick walls. It differs from the smooth genus Camarophorina Lich- 

 arev in its uniplicate rather than sulcate commissure, its high-vaulted 

 fold, and presence of an intercamarophorial plate. Camerisma is not 

 closely similar to other genera of the Stenoscismatacea. 



Discussion. — Species of this genus seem to be essentially noncostate, 

 although two species have a few weak costae confined to the fold and 

 sulcus of some individuals. The smooth exterior and high Gothic arch- 

 like fold were diagnostic features of Psilocamara Cooper (1956a). 

 Now it is determined that the intercamarophorial plate is consistently 

 absent from Pennsylvanian Psilocamara, a significant generic distinc- 

 tion from the externally similar Permian forms in which the plate is 

 present. Therefore, the group in which the plate is present, and the 

 fold Pugnax-like, needs a new generic category. These species are 

 designated Camerisma. 



Range. — Mississippian to Lower Permian. 



The only species known definitely to belong to Camerisma are the 

 two from Alaska and C. sagmarium n. sp. from the Lower Permian 

 (Artinskian) of Yugoslavia. Schellwien (1900) reported this species 

 as Camerophoria sella (Kutorga) from the Trogkofelschichten of the 

 Karawanken Range near Neumarktl, Yugoslavia, the locality from 

 which the type specimens of C. sagmarium are derived. This horizon 

 now is interpreted as Artinskian by Gignoux ( 1955) . 



Camarophoria sella is reported from the Upper Carboniferous 

 (Gschelian, C3) in Darvaz, U.S.S.R. (Tschernyschev, 1914), and 

 from the Lower Permian in the Ural and Timan regions (Tscherny- 

 schev, 1902). 



Tschernyschev (1902) reported Camarophoria pentameroides 

 Tschernyschev from the Lower Permian ("Scliwagcrina horizon") in 

 the Ural region, and Sarycheva and Sokolskaya (1952) report it from 

 the mid-Moscovian (Podolskian) to the Gschelian. 



Grabau (1936) reported both C. sella and C. pentameroides from 

 the Maping Limestone of Kweichow, China. His specimens differ in 

 several respects from either of these species, but nevertheless, they 

 may belong properly to Camerisma. The Asian specimens are from 

 beds that are Uralian, according to Grabau's analysis of the fauna, 



