142 PROCEEDINGS OF THE NATIONAL MUSEUM vol.77 



represents a cool water relative of Sigmoidella elegantissima (Parker 

 and Jones). 



Distribution. — Our specimens represent the following localities : 



Recent. — Off Japan, Kobama (abundant). Albatross D4883, 53 

 fathoms, about 20 miles southwest of Nagasaki entrance, Eastern 

 Sea; Inland Sea. Philippines, D5143, 19 fathoms, off Jolo Jolo; 

 D5311, 88 fathoms, China Sea, near Hongkong. 



Pleistocene. — Japan, Alluvium, Kehi, Province of Tajima. 



Pliocene. — Upper, Japan, Kumomya, Province of Totomi; Okuwa, 

 Province of Kaga; Ono, Province of Kochi; Natsukawa, Province of 

 Echigo. Lower Pliocene, Beaumaris, near Melbourne, Victoria, 

 Australia. 



Miocene. — Australia, Janjukian, polyzaal marl, overlying lime- 

 stone, Filter quarries, Batesford, Victoria. 



SIGMOIDELLA PLUMMERAE Cashman and Ozawa, new species 



Plate 39, figures S a, h 



Test compressed, ovate, broadly rounded at the base, acute 

 toward the aperture, periphery angular; chambers elongated, more 

 or less compressed, arranged in a contraclockwise sigmoid series, 

 each succeeding chamber embracing the earlier one, but often the 

 last chamber not extending dov/n to the initial end; sutures not 

 depressed, usually distinct; wall rather thin, smooth; aperture radiate. 



Length of holotype 0.70 mm.; breadth 0.35 mm.; thickness 0.22 

 mm. 



Holotype. — (Cushman Coll. No. 11879.) From the Eocene, Cooks 

 Mountain formation, Smith ville, Tex. 



The main difference between the present species and Sigmoidella 

 elegantissima is the sigmoid arrangement of chambers, that of the 

 present species being contraclockwise, while that of S. elegantissima 

 is clockwise. 



Distribution. — It is common in the Eocene in the United States, 

 especially in the Claiborne, but ranges from the Cooper marl to the 

 Midway. We have it from numerous localities from South Carolina 

 to Texas. The species is named for Mrs. Helen J. Plummer. 



SIGMOIDELLA MARGARETAE Cushman and Ozawa, new species 



Plate 39, figures 4 a, b 



Test much compressed, ovate in outline, periphery very angular; 

 chambers compressed, elongated, arranged in a contraclockwise 

 sigmoid series, each succeeding chamber extending down to the base 

 and embracing the earlier ones; sutures not depressed, distinct; wall 

 smooth, rather thin; aperture radiate. 



Length of holotype 0.50 mm. ; breadth 0.25 mm. ; thickness 0.10 mm. 



