l82 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



Pace 



4. Ventral, dorsal, lateral, posterior, and anterior views, USNM 

 142111, USGSloc. 3703. 



5. Anterior view of large broad specimen showing height of fold, 

 USNM 142112, USGS loc. 3703. 



5a. Section, etched, X3, 3 mm. from beak, showing camarophorium 

 with duplex septum, hinge plate, low cardinal process, spondylium 

 with septum duplex thickened by secondary shell material, USNM 

 142110, USGS loc. 3747. 



5b. Anterior view of specimen in 5a, (USNM 142110) showing longi- 

 tudinal groove in sulcus and on fold. 



Plate 18 



1-lc. — Coledium rhomboideum (Phillips) X2 118 



1. Ventral, dorsal, anterior, and posterior views, Lower Carboniferous, 



Vise, Belgium, USNM 96353a. 

 la. Ventral, dorsal, lateral, and posterior views, same loc. as 1., USNM 



96353b. 

 lb. C. aff. C. rhomboideum (Phillips) ventral, dorsal, lateral, and 

 anterior views; Lower Tournaisian, Kirghiz Steppe, U.S.S.R. 

 USNM 89565. 

 lc. Ventral, dorsal, and lateral views, Carboniferous Limestone Series 

 (Lower Carboniferous) Balladoole, Isle of Man, USNM 96989. 

 2. — Coledium globulinum (Phillips) X2, ventral, dorsal, and anterior views, 



Permian, Tunstall, near Sunderland, England, USNM 96284 119 



3. — Coledium pleurodon (Phillips), X2, ventral, lateral, anterior, and post- 

 erior views, Lower Carboniferous, Tournai, Belgium, USNM 63210. 118 

 4. — Coledium nuculum (Schellwien), X2, ventral, dorsal, and lateral views, 



Permian, Neumarktl, Krain, Yugoslavia, USNM 63163 118 



5~5a. — Coledium opimum n. sp., X2, Pennsylvania, Chariton County, Mo. 



5. Lateral and ventral views, USNM 142447 124 



5a. Ventral, dorsal, left, right, and posterior views, holotype, USNM 

 142448. 

 6. — Coledium crassum (Hamlet) XI, Permian, Basleo, Timor, ventral 



dorsal, lateral, and anterior views, USNM 92212 Ill 



Plate 19 



1— lb. — Stenoscisma hueconianum (Girty), X2, Hueco Limestone, Hueco 



Mountains, Tex 147 



1. Dorsal, lateral and anterior views of specimen with narrow stoli- 

 dium, USNM 142513. 



la. Lateral view of interior, showing camarophorium and crus, USNM 

 142514. 



lb. Dorsal, lateral and anterior views of specimen with only small 

 remnant of stolidium, USNM 142512. 

 2-2a. — Stenoscisma biplicatum (Stuckenberg) X2, Permian, Russia (Dun- 

 bar coll., Yale Peabody Mus.) 



2. Dorsal and anterior views, YPM 23261. 



2a. Anterior view of interior showing camarophorium, YPM 23262. 



