ART. 6 FORAMINIFERA: POLYMORPHINIDAE — CUSHMAN AND OZAWA 131 



Polymorphina megapoliiana, described by Clodius from the Miocene 

 of Mecklenburg, is placed under the present species although it has a 

 spine at the initial end. 



Distribution. — The present species seems to be limited to the later 

 Tertiary in Europe. Karrer described it from Lapugy in Siebenbur- 

 gen. Clodius's specimens are also from the Miocene. We have it 

 from the Crag of Sutton, England, and from the Miocene, Burdigalien 

 inferieur, Le Coquillat, Leognan, France. A form very similar to 

 this occurs in the upper Pliocene, Natsukawa limestone, Natsukawa, 

 Province of Echigo, Japan. 



SIGMOMORPHINA UNDULOSA (Terquem) 



Plate 34, figures 4, 5 



Polymorphina amygdaloides Terquem (not Reuss), Mem. Soc. Geol. France, 

 ser. 3, vol. 1, 1878, p. 39, pi. 3 (8), figs. 22, 25 (not 23, 24, 26-30). 



Polymorphina undulosa Terquem, Mem. Soc. Geol. France, ser. 3, vol. 1, 

 1878, p. 41, pi. 3 (8), figs. 35 a, h, (not 36). 



Test oval to ovate, compressed; chambers elongated, embracing, 

 arranged in a contraclbckwise sigmoid series, each succeeding chamber 

 not much removed from the base; sutures depressed, distinct; wall 

 smooth, rather thin, often covered with fistulose tubes; aperture 

 radiate. 



Maximum length 0.60 mm.; breadth 0.30 mm.; thickness 0.15 mm. 



This species is undoubtedly related to Guttulina ladea, from which 

 it is derived by losing the quinqueloculine arrangement of chambers 

 and becoming sigmoidal. The direction of the sigmoid arrangement 

 of chambers appears not to be definitely fixed, and rarely there 

 are some specimens showing a clockwise sigmoid arrangement of 

 chambers. 



Some figures of Polymorphina amygdaloides Terquem (the first 

 figure of the species, 22, and fig. 25, ? 26), described in 1878, coincide 

 with the present species, but the specific name amygdaloides is pre- 

 occupied by Reuss in 1856 {Glohulina amygdaloides Reuss in 1851); 

 therefore undulosa is chosen for the present species. 



Distribution. — S. undulosa occurs in European late Tertiary de- 

 posits as well as in the Recent state. We have specimens of the 

 species from the localities listed below: 



Recent. — Atlantic, Lord Bandon, dredgings southwest of Ireland; 

 coast of Iceland; coast of Brazil; Dry Tortugas, Fla., 18 fathoms. 



Pliocene. — England, Crag of Sutton. 



SIGMOMORPHINA LAMARCKI Cnshman and Ozawa, new species 



Plate 34, figures 6 a-c 



Test oval, rounded at the base, obtuse at the apertural end, com- 

 pressed, periphery rounded; chambers much longer than wide, 



