8 4 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



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B 



037) 



Fig. 16. — Camarophorina antisella (Broili), Permian at Basleo, Timor; trans- 

 verse sections X5, USNM 142044, original length 11.0 mm., measurements from 

 pedicle valve beak. 



A. 0.8 mm. : spondylium elevated, camarophorium not shown, but visible 

 through clear shell. B. 1.2 mm.: hinge plate and cardinal process visible, cama- 

 rophorium thick, without intercamarophorial plate. C. 1.6 mm. : intercamaro- 

 phorial plate definitely absent. D. 1.8 mm. : plates and septum of spondylium 

 very thin. E. 2.6 mm. : spondylium absent, duplex septum of camarophorium 

 apparent. F. 3.0 mm. : trough of camarophorium deep. G. 3.4 mm. : trough of 

 high camarophorium slightly distorted, pushed onto septum. Camarophorium ends 

 3.9 mm. from beak. 



