196 CRETACEOUS PALEONTOLOGY. 



size from below downward ; aperture a central arched opening in 

 the ultimate segment. 



"Length, 0.43 mm." (Bagg). 



Formation and locality. Navesink marl, Freehold (Bagg). 



Geographic distribution. New Jersey. 



Verneuilina triquetra (Minister). 

 Plate I., Fig. 22. 



1838. Texttdaria triquetra Miinster, in Rcemer's paper, Neues 



Jahrb., p. 384, pi. iii, fig. 19. 

 1851. Textularia atlantica Bailey, Smithsonian Contrib., vol. ii,. 



art. 3, p. 12, figs. 38-43. 

 1884. Verneuilina triquetra Brady, Chal. Rept, vol. ix, p. 383, 



pi. xlvii, figs. 18-20. 

 1898. Verneuilina triquetra Bagg, Bull. U. S. G. S., No. 88, p, 



30, pi. 2, fig. 2. 



Description. "Test composed of coarse sand grains and 

 scattered grains of glauconite, triserial; chambers with flattened 

 sides, definitely marked by sutures, eight to ten in each series; 

 transverse section an almost equilateral triangle; surface rugose, 

 and the coarse sand grains are interspersed with grains of glau- 

 conite; septal lines arched in the central portion and directed 

 downward toward the edges; triangular edges not always 

 straight, but curved somewhat in passing frqm the primordial to 

 the distal end ; aperture a median elongated slit with a depressed 

 margin. 



"The shell is of a dull-gray color, and attains large size. 



"An analysis of Verneuilina triquetra gave 41.37 per cent, of 

 silica. The sand grains are very firmly cemented by calcareous 

 substance which forms the base of the shell. 



"It is a very common species. 



"Length, 3.13 mm." (Bagg.) 



Formation and locality. Vincentown limesand, Vincentown r 

 Mullica Hill, Timber Creek (Bagg) ; Manasquan marl, Vincen- 

 town (Bagg). 



Geographic distribution. New Jersey. 



