90 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



so constructed that its development was impossible. Although not spe- 

 cifically stated by Tschernyschev, his implication is that presence or 

 absence of the stolidium was genetic. He did not consider it advisable 

 at the time to subdivide "Camarophoria" on that basis. However, now 

 it appears that two distinct phyletic stocks are involved, and subdivi- 

 sion is necessary. I believe that of the many species that Tschernyschev 

 (1902, p. 76-101, 488-510) assigned to Camarophoria, most of those 

 in his Group IV (p. 77) probably belong to Cyrolexis: C. sup erst es 

 (Verneuil), C. netschajevi Tschernyschev, and C. parvula Tscherny- 

 schev. He also included C. rhomboidea (Phillips) in Group IV, and 

 named the group for it, although that species is not present in his 

 Ural-Timan fauna. Specimens similar to C. rhomboidea (Phillips) in 

 the U.S. National Museum collection (not topotypes) support Tscher- 

 nyschev's contention that that species lacked the stolidium congenitally. 

 However, they are not similar to Cyrolexis haquei nor to the Ural- 

 Timan species of Tschernyschev's Group IV. Instead they most nearly 

 resemble Coledium bowsheri (Cooper) and probably are congeneric 

 with it. Species in Tschernyschev's other five species-groups of Cam- 

 arophoria belong to genera other than Cyrolexis; most can be assigned 

 to Stenoscisma. 



Tschernyschev (1902, p. 77) included Terebratula globulina Phillips 

 with the species of Camarophoria in Group IV. The specimens that he 

 illustrated appear to be of the type that completely lacks the stolidium, 

 but they more clearly resemble T. rhomboidea Phillips than other spe- 

 cies of Group IV. Therefore, perhaps they should be linked with that 

 species, probably in the genus Coledium n. gen. Specimens of Phillips' 

 species in the U.S. National Museum collection greatly resemble 

 Tschernyschev's illustrations, confirming his identification and sup- 

 porting my contention that the species belongs more properly with 

 Coledium than with Cyrolexis. 



Species belonging to Cyrolexis. — 



Cyrolexis haquei n. sp. (type species) 



Camarophoria waageni Netschajev, 1894 (same as Camarophoria superstes 

 (Verneuil) of Waagen, 1883) 



Terebratula superstes Verneuil, 1845 

 Species probably belonging to Cyrolexis. — 



Camarophorina superstes (Verneuil) of Tschernyschev, 1902 



Camarophoria netschajewi Tschernyschev, 1902 



Camarophoria parvula Tschernyschev, 1902 



Camarophoria superstes (Verneuil) of Licharev, 1913, 1960 

 Species possibly belonging to Cyrolexis. — 



Dielasma cf. D. gemmula de Koninck of Diener, 1915 



Camarophoria karpinskii Tschernyschev, 1902 



Comparisons. — Cyrolexis is characterized by its strongly curved 



