1890.] NEW-YORK MICROSCOPICAL SOCIETY. 51 



narrow and shallow depression or none at all, or in place of it a small, flat 

 disk-like elevation which is very finely porous. The chambers appear 

 upon this surface as narrow triangles, somewhat curved, the sutures more 

 distinct, as shallow lines. The porous canals, of the spiral side, are some- 

 what wider than the umbilical side. The aperture is a short opening 

 situated far below the peripheric border. 



5. R. Karsteni, Rss. Zeitschr. d. deutsch. geolog. Gesellsch., 1855, 

 273, pi. ix. fig. 6. Very rare. 



Rosalina, d'Orb. 



1. R, amino iioides, Rss. Reuss in Haidinger's gesamm. naturwiss. 

 Abhdl., iv. I, 36, pi. iv. fig. 2. Very rare. More frequent elsewhere in 

 the upper chalk-beds, down to the Cretaceous. 



2. R. Bosqiieti, n. sp. L. c. 316, pi. iii. fig. i. Very rare. Also in 

 the chalk-tufa of Mastricht. 



Truncatulina, d'Orb. 



1. Tr, convexa, Rss. L. c. 331. Very rare. Is very variable, often 

 bent and not always so arched as in the figure referred to on the above- 

 mentioned page. PI. iv. fig. 4. 



2. 7>-. Dt' Kayi, n. sp. PI. vii. fig. 6. Very rare. The shell which 

 is only 0.49 mm. in diameter, is circular ; the spiral side smooth, and only 

 the last chamber slightly arched, with three whorls and a wrinkled upper 

 surface. The umbilicate side arched, regular, with eight small curved 

 chambers, of which only the last are marked off by distinct sutures. The 

 surface coarsely punctate. 



5. POLYMORPHINIDEA, d'Orb. 

 Bulimina, d'Orb. 



1. B. iortilis, n. sp. PI. viii. fig.. 3. Frequent. A peculiar small 

 species, at the most 0.52 mm. long, triangular pyramidal, with 

 somewhat concave sides, and three longitudinal edges, which gradually 

 become thicker and more obtuse from below upward, and which 

 do not run directly up, but turn gradually in their course so that 

 the whole shell seems twisted. Five whorls, the first ones verj- 

 small, each consisting of three small semilunate curved chambers ; the 

 older ones e-xternally, scarcely separable, slightly arched ; the latter ones 

 rapidly increasing in size, and becoming more strongly arched. The 

 orifice, a short elliptical aperture, beginning immediately under the obtuse 

 point of the last chamber, and running down toward the lateral surface of 

 the shell. 



2. B. sp. indet. Similar to B. pupoides, d'Orb., — Foram. foss. du 

 bass. tert. de Vienne, pi. ii. figs, ir, 12, — with an elongated, smooth 

 irregular shell, with a roundish transverse section. Only one incomplete 

 specimen. 



PoLYMORPHiNA, d'Orb. 



a) Globulina, d'Orb. 



I. Gl. globosa, V. Mstr. L. c. 318. Very rare. 



