FAMILY 17. OPTHALMIDIIDAE 161 



Genus HEMIGORDIUS Schubert, 1908 

 Plate 53, figures 5-7 



Genoholotype, Cormisjnra schlumbergeri Howchin 



Hemigordius Schubert, Jahrb. k. k. Geol. Reichs., vol. 58, 1908, p. 381. 

 Cornuspua Howchin (not Schultze), Trans. Roy. See. South Australia, 

 vol. 19, 1895, p. 195. 



Test in the early coils not entirely planispiral, later ones 

 planispiral and completely involute but test not umbonate; wall 

 apparently calcareous, somewhat laminated. 



Carboniferous. Australia, Japan and America. 



Genus CORNUSPIROIDES Cushman, 1928 

 Plate 54, figures 12, 13 



Genoholotype, Cornuspira striolata H. B. Brady 



Cornuspiroides CuSHMAN, Contr. Cushman Lab. Foram. Res., vol. 4, 1928, 



p. 3. 

 Cornusph-a (pai't) of authors. 



Test in the early stages planispiral, the coils of fairly uniform 

 height, in the adult the height of the coil greatly increasing and 

 no longer truly coiled but spreading out in a fan-shape ; interior 

 not divided into chambers; wall calcareous, imperforate, show- 

 ing distinct lines of growth ; aperture in the adult very elongate, 

 on the peripheral margin of the growing edge. 



Recent. Cold water of the North Atlantic. 



Genus CORNUSPIRELLA Cushman, 1928 



Plate 53, figures 16, 17 

 Genoholotype, Cormispira difformis Heron-Allen and Earland 



Cornuspirella Cushman, Contr. Cushman Lab. Foram. Res., vol. 4, 1928, 



p. 4. 

 Coynuspira (part) of authors. 



Test in the early stages planispiral, close coiled, the coils of 

 fairly even diameter, later the height of the coil expanding and in 

 the adult with long branching or flattened peripheral extensions ; 

 interior not divided into distinct chambers; wall calcareous, 

 imperforate, with depressed lines of growth on the exterior; 



