NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA — GRANT 183 



Page 

 3-3a. — Stenoscisma multicostum Stehli, XI, Bone Spring Limestone, Sierra 



Diablo, Tex 148 



3. Ventral and lateral views of pedicle valve, USNM 1425 15. 

 3a. Dorsal and lateral views of brachial valve, USNM 142518. 

 4. — Stenoscisma kalum Stehli, XI, Bone Spring Limestone, Sierra Diablo, 

 Tex., interior of pedicle valve, USNM 142519, and interior of brachial 

 valve, USNM 142520 9 



Plate 20 



1-4. — Stenoscisma purdoni (Davidson) of Broili (1916), Upper Permian of 



Timor 149 



1. Ventral, dorsal, lateral, and posterior views of large adult, XI, 

 USNM 142521. 



2. Dorsal, anterior, lateral, and posterior views of large adult, XI, 

 USNM 142522, showing traces of several stolidia. 



3. Ventral, dorsal, lateral, posterior, and anterior views of small speci- 

 men, XI, USNM 142522, showing tightly closed beak, trace of one 

 stolidium. 



4. Pojterior view of internal cast, X 1, showing spaces formerly occu- 

 pied by spondylium and camarophorium, USNM 142524. 



Plate 21 



1-12. — Stenoscisma schlotheimi (von Buch), X2, Middle Zechstein, Poss- 



neck, Germany 143 



1. Dorsal and lateral views, YPM 23263. 



2. Dorsal and lateral views, YPM 23267. 



3. Dorsal and lateral views, YPM 23268. 



4. Dorsal and lateral views, YPM 23271. 



5. Dorsal and lateral views, YPM 23272. 



6. Dorsal and lateral views, YPM 23274. 



7. Dorsal and lateral views, YPM 23275. 



8. Dorsal, lateral and anterior views, YPM 23278. 



9. Dorsal, lateral and posterior views, YPM 23279. 



10. Interior; camarophorium (with anterior broken), crura, and spon- 

 dylium, thickened by post mortem calcite, YPM 23285. 



11. Dorsal, lateral, anterior and posterior views, YPM 23284. 



12. Dorsal, lateral and anterior views, YPM 23283. 



13. — Stenoscisma venustum (Girty), interior X2, Leonard Formation, Glass 

 Mountains, Tex., introduced to elucidate broken and thickened in- 

 ternal structures of fig. 10, USNM 142526 150 



Plate 22 



1-10. — Stenoscisma venustum (Girty), Leonard Formation, Glass Moun- 

 tains, Tex 150 



1. Dorsal, lateral, anterior, and posterior views, XI, of specimen with 

 stolidium, USNM 142528. 



2. Dorsal view, XI, showing stolidium, USNM 142529. 



