132 PROCEEDINGS OF THE NATIONAL MUSEUM vol.77 



slightly compressed, slightly embracing, arranged in a clockwise 

 sigmoid series, each succeeding chamber farther removed from the 

 base; sutures somewhat depressed, distinct; wall entirely ornamented 

 by numerous fine costae, rather thick; aperture radiate. 



Length of holotype 0.62 mm. ; breadth 0.32 mm. ; thickness 0.15 mm. 



Eolotype. — (Cushman Coll. No. 11840.) From the Eocene (Lute- 

 tien), Campbon, France. 



The general outline is very similar to Sigmomorphina semitecta, 

 but it is ornamented and the test has a tendency to elongate. The 

 specific name is given for Lamarck. 



SIGMOMORPHINA PEARCEYI Cushman and Ozawa, new species 



Plate 35, figures 2, 3 



Polymcrphina inflata Pearcey, Trans. Roy. Soc. Edinburg, vol. 49, 1914, p. 

 1,023, pi. 2, figs. 14^16. 



Test elongate, clavate, the greatest breadth in the upper half, 

 tapering toward the base, apertural end rounded; chambers more or 

 less compressed, early ones elongated, later becoming rounded, 

 generally the last one much inflated and large, arranged in a contra- 

 clockwise sigmoid series, each succeeding chamber, especially the last 

 one or two, removed farther from the base; sutures depressed, distinct; 

 wall smooth, thin, translucent; aperture near the center of the last 

 chamber, with short entosolenian tube. 



Length of largest specimen 0.80 mm.; breadth 0.50 mm.; thickness 

 0.45 mm. 



Holotype. — (Cushman Coll. No. 11841.) From off Dry Tortugas, 

 Fla., 18 fathoms. 



The later chambers of the present species tend to become more 

 circular and are removed farther from the base, yet they are arranged 

 in a sigmoid series. This species is well characterized and for the first 

 time described by Pearcey under the name " Polymorphina inflata," 

 but the name is preoccupied first by Zittel in 1876, and secondly by 

 Terquem in 1886. Zittel's Polymorphina inflata is apparently a mis- 

 take for P. lactea Williamson, as explained by Sherborn. Glohulina 

 inflata Reuss is different from either ZittePs or Terquem's P. inflata. 



We can not use the specific name "inflata" for the present species; 

 therefore "pearceyi" is proposed for Pearcey, the first recorder of the 

 species. 



Distribution. — It is a very rare species. Pearcey recorded it from 

 the Scottish Antarctic Expedition collections. We have one specimen 

 from the Eocene of Val di Lonte, Italy, and two specimens from the 

 Atlantic, off Gasp6, between Ship Head and Cape Bonne Ami, 30 

 fathoms, and off the Tortugas, Fla., 18 fathoms. The range of these 

 three specimens seems to show that even though they seem very much 

 alike, more material may show that these are not all the same. 



