I76 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



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 4. — Atribonium sp., intermediate between A. cooperorum and A. simatutn, 

 X2, lower part of Ferron Point Formation, Adams Point, Mich., 

 USNM 141833 47 



Plate 3 



1-1E. — Atribonium gregeri (Branson) , X2 48 



1. Ventral, dorsal, lateral, and posterior views, USNM 141855, upper 

 part of Callaway Limestone, Danville, Mo. 



la. Ventral, dorsal, lateral, and posterior views, USNM 141841, Cedar 

 Valley Limestone, Scott Co., Iowa. 



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

 141845, Cedar Valley Limestone Scott Co., Iowa. 



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

 141856, upper part of Callaway Limestone, Danville, Mo. 



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

 141848, Cedar Valley Limestone, Andalusia, 111. 



IE. Section about 0.5 mm. from beak, X4, USNM 141857, Cedar Valley 

 Limestone, Scott Co., Iowa. 

 2-2a. — Atribonium rostratnm n. sp. X2, Thunder Bay Limestone at Par- 

 tridge Point, Mich 60 



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

 141949. 



2a. Ventral, dorsal, lateral, posterior, and anterior views, USNM 

 141950, holotype. 



3. — Atribonium pauperum (Belanski), X2, Shell Rock Limestone of 



Thomas, 1924, Nora Springs, Iowa. USNM 71027 55 



4. — Atribonium kernahani (Whiteaves) X2, Centerfield Limestone Mem- 

 ber of Ludlowville Shale, East Bethany, New York, USNM 141863. 53 



Plate 4 



l-2b. — Sedenticellula hamburgensis (Weller), X2, Hamburg Oolite (of 



Weller, 1914), near Hamburg, 111 73 



1. Ventral view, USNM 142007. 



la. Ventral, dorsal, and posterior views, USNM 142014. 



lb. Ventral, dorsal, anterior, and lateral views, USNM 142016. 



lc. Ventral, dorsal, and anterior views, USNM 142017. 



2. Ventral valve, USNM 142020. 

 2a. Ventral valve, USNM 142019. 

 2b. Dorsal valve, USNM 142022. 



3-3a. — Septacamera cf. 5". plicata (Kutorga) XI, Coyote Butte Formation, 



Oregon (photos by G. A. Cooper) 159 



3. Ventral valve, USNM 125385b, Cooper (1957) loc. 2201-4. 



3a. Lateral, posterior, and anterior views, USNM 125385a, Cooper 



(1957) loc. S103. 

 4. — Septacamera kutorgac (Tschernychev), holotype, XI, from Licharev 



(1960, pi. 48, fig. 6-6g) Sakmarian of Pre-Urals 159 



5. — Camarophoritiella caucasia Licharev, holotype, XI, from Licharev 



(1960, pi. 49, fig. 1-lg), Upper Permian Northern Caucasus 87 



