MARYLAND GEOLOGICAL SURVEY 473 



Textulaeia subangulata d-Ol•bignJ^ 

 Plate CXXXri, Fig. 13. 



Textularia siibanrjulata d'Orbigny, 1846, Foram. Fossiles Vietine, p. 274, pL xv, tigs. 



1-3. 

 Textularia suhangulata Bagg, 1898, Bull. Amer. Pal., No. 10, p. 20. 



Description.— "Ye^i consisting of a relatively small number of cham- 

 bers which increase very rapidly in size from the posterior to the ante- 

 rior end; peripheral margins sharp-angled. The sides of the shell are 

 laterally compressed and parallel, only their extremities forming the 

 sharp peripher}^ The posterior end is acuminate, anterior broad, ob- 

 tusely rounded; ultimate chamber much elevated and larger than any 

 other segment. The aperture is a median arched slit situated on the 

 inner margin of the final segment. 



Occurrence. — Choptank Formation. Governor Kun. 



OoZZeciton.— Maryland Geological Survey. 



Genus BOLIVINA d'Orbigny. 

 The genus Bolivina possesses the biserial or Textulariform development 

 of its chambers, but it never loses the elongation and inversion of its lip 

 so characteristic of the "Bulimine type and this aperture is usually some- 

 what oblique. While possessing characters similar to both Textulariform 

 and Bulimine types as above mentioned it also is allied closely with the 

 genus Valvulina which has the same segment arrangement. Its earliest 

 occurrence as a fossil is in the Cretaceous and it becomes more frequent 

 in subsequent deposits. At the present time the genus is very evenly 

 distributed over every latitude and Prof. Brady states that it is found 

 at from a few to 2000 fathoms, but usually on bottoms of less than 300 

 or 400 fathoms. 



Bolivina beyrichii var. alata Seguenza. 

 Plate CXXXII, Fig. 14. 



Valvulina alata Seguenza, 1862, Atti dell' Accad. Gioeuia, ser. ii, vol. xviii, p. 113, 

 pi. ii, flgs. 5, 5a. 



Description. — This species is a modification of B. beyrichii and is 

 closely related to B. gramen {Valvulina gramen d'Orb.). The former 

 is, however, more slender and somewhat narrower and has greater depth 



