114 PROCEEDINGS OF THE NATIONAL MUSEUM vol.77 



POLYMORPHINA FORNASINH Cushman and Ozawa, new species 



Plate 29, figures 8 a, b 



Test compressed, oblong, greatest breadth in the upper half 

 tapering toward the acute base, periphery rounded; chambers eion 

 gated, arranged at first in a more or less sigmoid series becoming 

 regularly biserial; sutures slightly depressed, distinct; wail smooth, 

 thin, transparent; aperture radiate. 



Length of holotype 1.25 mm. ; breadth 0.60 mm. ; thickness 0.30 mm. 



Holotype.—(Cush.m.&n Coll. No. 9,867.) Recent, off Tripoli. 



The early chambers of the species are sigmoidaily arranged, but 

 the later ones are regularly biserial and alternating, sometimes 

 becoming very irregular and spreading. 



The species is named for Prof. C. Fornasini of Bologna, Italy. 



POLYMORPHINA INCAVATA Stache 



Plate 29, figures 9 a, b 



Polymorphina incavata Stache, Novara Exped., Greol. Theil 1, 1864, p. 260, 



pi. 24, figs. 7 a, h. 

 Polymorphina dispar Stache, Novara Exped., Geol. Theil 1, 1864, p. 261, 



pi. 24, figs. 8 a, b. 



Test more or less compressed, elongated, rounded at the base; 

 chambers twice as long as wide, more or less inflated, not much 

 embracing, arranged in a biserial series; sutures slightly depressed, 

 distinct; wall smooth; aperture radiate. 



We have no specimen which we can identify with the present 

 species, and the above description is given in accord with the original 

 figures. Stache's P. dispar is very similar to the present species. 

 It may be a young specimen. It seems to be known only from the 

 Tertiary, Upper Eocene, at Whaingaroa Port, New Zealand. 



POLYMORPHINA SUBRHOMBICA Reuss 



Plate 30, figures 1-3 



Polymorphina subrhombica Reuss, Sitz. Akad. Wiss. Wien, vol. 44, pt. I, 

 1861 (1862), p. 339, pi. 7, fig. 3. 



Test compressed, rhombic (young) to subrhomboidal (adult), 

 symmetrical, margin angular; chambers rather broad, not much em- 

 bracing, alternating; wall smooth, thick; sutures not depressed, but 

 distinct; aperture radiate. 



Maximum length 2.60 mm.; breadth 1.30 mm.; thickness 0.50 mm. 



The present species has fairly large dimensions and even a few 

 chambered specimen attains 1 millimeter in length. It has but a 

 slight resemblance to Polymorphina complanata, with which it has 

 been generally considered to be identical. The narrow elliptical end 

 view is enough to separate the present species from any other of the 



