8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 149 



to Rhynchotrema. More material than the single specimen available 

 is needed, especially well-preserved brachial interiors, before proper 

 identification can be made. 



Figured specimen. — USNM 145323. 



Superfamily SPIRIFERACEA Waagen, 1883 



Genus CYCLOSPIRA Hall and Clarke, 1893 



Cyclospira cf . C. glansfagea Cooper and Kindle 



Plate 2, figures 2, 4, 6 



Cyclospira glansfagea Cooper and Kindle. Cooper and Kindle, 1936, Jour. 

 Paleontology, vol. 10, No. 5, p. 359, pi. 52, figs. 1, 4, 7. 



Description. — Shell biconvex, subpentagonal in outline ; brachial 

 valve with single median costa constituting low fold; narrow sulcus 

 bounded by two low costae on pedicle valve ; no other ornamentation. 

 Portion of spire shown in one broken specimen with spire extending 

 well over halfway to anterior margin. 



Discussion. — All of the specimens at hand are very small as com- 

 pared with both C. bisulcata (Emmons) and C. glansfagea. In shape of 

 profile and depth of sulcus they compare favorably with the latter and 

 may represent immature specimens of that species. Larger collections 

 than the present very limited ones will be necessary to indicate their 

 true nature. 



Figured specimens. — USNM 145337, 145338. 



Cyclospira? sp. 

 Plate 2, figures 8, 11, 13 



Discussion. — A small, smooth biconvex specimen is perhaps as- 

 signable to this genus. It has the shape characteristics of an immature 

 individual. Although it is about the same size as the specimens re- 

 ferred to C. cf. C. glansfagea, it does not show the characteristic 

 pentagonal shape or sulcus in the pedicle valve. If more material 

 were available, this might prove to be a distinct species of Cyclospira. 



Figured specimen. — USNM 145339. 



Genus CATAZYGA Hall and Clarke, 1893 



Catazyga homcospiroides Ross and Dutro n. sp. 



Plate 1, figures 7, 9, 10, 15, 17-20 



Description. — Shell equally biconvex, longer than wide, subovate in 

 outline ; costellate ornamentation, with 6 costellae in space of 5 mm 



