1898.] NATURAL SCIENCES OF PHILADELPHIA. 469 



This form, which approaches the Geratmdus group, is distinguished 

 by the incrusted or warty appearance of the surface. 

 Plate XXIV, fig. 5. 



Biddulphia Keeleyi n. sp. Boyer. 



Valve broadly rhombic-elliptical, rounded at the ends. Surface 

 slightly convex, without depression, reticulated, the reticulations 

 unequal, hexagonal, about 2 in .01 mm., with puncta within the 

 reticulations about 8 in .01 mm. Three stout spines are placed on 

 each side near the margin. Processes inflated at the base, small at 

 the apex and placed not at the ends of the valve but obliquely 

 opposite, near the ends. 



L. ofV. .148 mm. 



U. S. S. " Tuscarora" Soundings, Lat. 36° 12' N., Long. 123° 11' 

 W., 1,605 faths. Also coast of California. Rare. 



Only two specimens have been noticed, one of which was found 

 by Mr. F. J. Keeley on seaweed from California. 



Plate XXIV fig. 4. 

 Biddulphia Argus n. sp. Boyer. 



Valve broadly elliptical, convex, with an elliptical depression at 

 centre. Surface finely reticulate, the reticulations, more or less 

 hexagonal, about 3 in .01 mm. at the border, and 5 in .01 mm. at 

 the centre from which they radiate in curved lines. The central 

 depression is encircled by from ten to twelve short spines. Pro- 

 cesses rather short and obtuse. 



L. of V. .165 mm. 



Port Antonio, Jamaica. Not common. 



Distinguished chiefly by the central spines and by the size of the 

 reticulations, whence the name. It approaches B. Roperiana Grev. 



Plate XXIV, fig. 6. 

 Biddulphia semicircularis Asburyana n. var. Boyer. 



Valve arcuate with the ends produced and elevated into rounded 

 processes. Surface not divided by costate lines, convex, punctate, 

 the puncta rounded about 6 in .01 mm. near the hyaline ex centric 

 space from which they radiate irregularly, increasing in size to 

 about 1 j in .01 mm. at the margin where they are irregular and 

 occasionally confluent. 



L. of V. .181 mm. 



Fossil in the Miocene deposit from the artesian well at Asbury 

 Park, N. J. at a depth of 40 ft. Not uncommon. 



