AET. 6 FORAMINIFERA: POLYMORPHINIDAE — CUSHMAN AND OZAWA 129 



slightly twisted, not much embracing, arranged in a contraclockwise 

 sigmoid series, each succeeding chamber removed farther from the 

 base; sutures but little depressed, distinct; wall smooth; aperture 

 produced, radiate. 



Maximum length 1.50 mm.; breadth 0.35 mm. 



Sigmomorphina torta is evidently related to Sigmomorphina frondi- 

 culariformis from which it is derived by having the chambers shortened 

 and more or less curved and accordingly the test is twisted. It is 

 one of the most specialized species of the genus. 



Distribution. — Galloway and Wissler described the species from the 

 Pleistocene D. M. S. and B. quarry, Lomita, Palos Verdes Hills, and 

 from the Pliocene of Timms Point, Calif. We have specimens from 

 both localities, and also Recent specimens from off the southern 

 California coast. 



SIGMOMORPHINA SEMITECTA (Renss) 



Plate 33, figures 6, 7 



Polymorphina semiteda Reuss, Sitz. Akad. Wiss. Wien, vol. 55, pt. 1, 1867, 



p. 91, pi. 3, fig. 10. 

 Polymorphina lucida d'Okbigny, Ann. Sci. Nat., vol. 7, 1826, p. 266, No. 



18. — FoENASiNi, Mem. Accad. Sci. Istit. Bologna, ser. 5, vol. 10, 1902, 



p. 51, fig. 50 (in text). 



Test compressed, oval to ovate, broadly rounded at the base, taper- 

 ing toward the aperture; chambers elongate, arranged in a clockwise 

 sigmoid series, all extending down to the base, but not involute; 

 sutures scarcely depressed, distinct; wall smooth, the apertural end 

 often with fistulose tubes; aperture radiate. 



Length 0.55 mm.; breadth 0.37 mm.; thickness 0.12 mm. 



The nearest ally of the present species is Sigmomorphina undulosa, 

 which has elongated chambers arranged in a sigmoid series, but each 

 succeeding chamber is much farther removed from the base and not 

 extending down to the base, as in the present species. 



Guttulina lucida d'Orbigny, figured by Fornasini, is undoubtedly a 

 young specimen of the present species. 



Distribution. — We have specimens referable to the present species 

 from the following localities : 



Miocene. — France, Aquitanien superieur. La Brede, Larriey. Hun- 

 gary, Tortonian shell sand, Varpolata. 



Eocene. — France, Lutetien, Parnes (Les B6ves). 



SIGMOMORPHINA SEMITECTA (Reuss) var. TERQUEMIANA (Fornasini) 



Plate 33, figures 4, 5; Plate 34, figures 2, 3; Plate 35, figure 1. 



Polymorphina amygdaloides Reuss var. terquemiana Fornasini, Mem. Accad. 



Istit. Sci. Bologna, ser. 5, vol. 9, 1900-1902 (1902), p. 72, fig. 25 (in text). 

 Polymorphina amygdaloides Terquem, Mem. Soc. G6ol. France, ser. 3, vol. 



2, 1882, p. 141, pi. 14 (22), figs. 30, 31. 



92709—30 9 



