NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT I49 



less well developed than the stolidium of 5. venustum. It is present on 

 the anterior edge of the pedicle valve of 6". multicostum, but absent 

 from the flanks of that valve. On the brachial valve it occurs at the 

 edges of both flanks and the fold. 



This trigonal and multicostate species is mimicked to some degree 

 by a Cretaceous rhynchonellid, Cyclothyris vespertilio (Brocchi) (pi. 

 7,fig.l). 



Table 33. — Measurements of Stenoscisma multicostum 



Measurements, in millimeters 



Occurrence. — Permian Bone Spring Limestone, locality 629 of 

 Stehli (1954), one-fourth mile south of Victorio Canyon on scarp of 

 Sierra Diablo, north of Van Horn, Tex. 



Age. — Early Permian. 



STENOSCISMA PURDONI (Davidson) 



Plate 20, figs. 1-4 



Camarophoria purdoni Davidson, BROILI, F., 1916, Perm. Brach. Timor, p. 55, 

 pi. 125 (11), figs. 7-23. 



Discussion. — This large species from Timor is illustrated as an ex- 

 ample of a Late Permian Stenoscisma whose pedicle foramen is com- 

 pletely closed by tight curvature of the beak of the pedicle valve onto 

 that of the brachial valve. The anterior margins show clearly the former 

 presence of stolidia on adults, although the stolidia are not preserved 

 on these calcareous specimens. This species undoubtedly lived its adult 

 life on the sea floor, free of peduncular attachment. 



These specimens correspond closely to those called C. purdoni by 

 Broili (1916). However, they bear little resemblance to Davidson's 

 ( 1863, pi. 2, fig. 4) Salt Range specimens of that name. Correct spe- 

 cific identification would require study and comparison of adequate 

 collections from Timor and the Salt Range ; therefore, Broili's name 

 for the species is used, advisedly, without citing the comprehensive 

 synonymy that appears in his book. 



