NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT Jl 



Table 12. — Measurements of specimens of Camerisma sagmaria from Neumarktl 



Measurements, in millimeters 

 USNM No. Length Width Thickness 



63169 c.10.0 c.10.0 7.3 



63169 10.3 11.4 10.0 



127876 11.8 12.9 10.3 



much smaller than C. ? pentameroides (Tschernyschev), is more el- 

 liptical and less transverse in outline, has a less strongly convex pedicle 

 valve, and a more narrowly arched fold. It differs from C. ? sella 

 (Kutorga) in its less distinctly demarcated fold, much longer pedicle 

 beak, and slightly more distinct costae, especially on the pedicle valve 

 (C. ? sella has one costa on each flank, weak or absent costae on fold), 

 and its less transverse outline. Kutorga (1844, pi. 9) enlarged the 

 drawing without so indicating (in fact, stating that there was no en- 

 largement) but Tschernyschev (1902, pi. 23) provided photographs of 

 the same specimen, showing its size near that of C. sagmaria. 



It is smaller and proportionately much narrower than C. prava n. sp. 

 and its fold is broader and not as sharp ; in addition, it shows no ten- 

 dency to asymmetry. It is much smaller than C. girtyi n. sp., propor- 

 tionately narrower, and has more numerous, although equally weak, 

 costae. 



Cooper (1956b) placed Camarophoria sella (Kutorga) in the genus 

 Psilocamara Cooper, on the basis of its smooth shell and high arched 

 fold. He noted absence of the intercamarophorial plate in Psilocamara, 

 but left open the question of its consistent absence in P. renfroarum, 

 the type species, and of its possible generic significance. Sectioning of 

 additional specimens of P. renfroarum indicates that the intercamaro- 

 phorial plate is truly absent ; however, it is unmistakably present, high, 

 thick, and long in Camerisa sagmaria. This species was identified by 

 Tschernyschev (1902, p. 509) as Camarophoria sella, therefore, the 

 probability is strong that it is congeneric with C. sella. The thick shell 

 seems to be a consistant feature of this genus, in contrast to the thinner 

 shell of Psilocamara, so the evidence supports the inference that the 

 intercamarophorial plate is present in C. ? sella and C. ? pentameroides, 

 similar to C. sagmaria and in contrast to P. renfroarum. Further dif- 

 ferences between C. sagmaria and P. renfroarum are in the much 

 larger size of the former, wider outline, proportionately lower and 

 broader fold, and presence of weak costae on the fold. 



Discussion. — This species shows most clearly the construction of the 

 camarophorium, spondylium, and intercamarophorial plate. All three 

 structures are duplex, each formed of two plates. The spondylium 



