86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



Discussion. — Camarophorinella was established by description and 

 illustration of the internal features of its type species (Licharev, 1936) . 

 Its exterior form was illustrated by Licharev in 1960, who questioned 

 its inclusion in the Camarophoriidae (Stenoscismatidae). 



The camarophorium of this genus is different from that of most 

 other genera of the Stenoscismatacea in that the edges of its trough 

 are directly attached to the sides of the divided hinge plate, whereas 

 in most other genera the hinge plate is undivided and is joined to the 

 midline of the camarophorium by the intercamarophorial plate, weakly 

 connected laterally (Cyrolexis and Camarophorina) or (as in Psilo- 

 camara) the camarophorium and hinge plate are entirely unconnected. 

 Licharev's serial sections (1936, text-fig. 4) show that the camarophor- 

 ium is characteristic for the superfamily in all respects except its 

 distal rather than mesial attachment to the hinge plate. Therefore, 

 Camarophorinella here is included with the superfamily Stenoscisma- 

 tacea. Divided or undivided hinge plates are variations that appear in 

 many groups of rhynchonellids, and normally are not accorded more 

 than generic importance. The manner of attachment of the camarophor- 

 ium probably reflects merely the incompatibility of an intercamaro- 

 phorial plate and a divided hinge plate. The edges of the camarophor- 

 ium in all genera of the superfamily are very near the underside of 

 the hinge plate, and in Permian genera they nearly are in contact. The 

 slight extension of the edges to meet the hinge plate seems a likely 

 structural modification to compensate for absence of the bracing effect 

 of the intercamarophorial plate. 



Type species. — Camarophoria (Camarophorinella) caucasica Lich- 

 arev, B., 1936, Am. Journ. Sci., ser 5, vol. 32, No. 187, p. 63, text 

 fig. 4, (original designation) ; exterior first illustrated by Licharev, 

 B., 1960, Osnovi Paleont, Moscow, p. 250, pi. 49, fig. 1. 



Additional species of camarophorinella. — Licharev (1936, p. 64, 

 text fig. 5) established Camarophorinella pauciconvexa as the second 

 species of Camarophorinella. He did not illustrate its exterior, but pre- 

 sented a series of 10 serial sections to show its internal structures. He 

 mentioned that he knew of no weakly costate or smooth species of 

 Camarophorinella, implying that C. pauciconvexa is strongly costate. 

 To my knowledge, this is all that has been written about the form of 

 this species. Like the type species, it is from the Permian of the North 

 Caucasus. 



Range. — The genus is represented by only two species : C. caucasica 

 Licharev and C. pauciconvexa Licharev. Both are from the Upper 

 Permian of the northern Caucasus. According to Licharev's (1960) 

 usage, Upper Permian includes the Kazanian and Tatarian. 



