162 



THE AMERICAN MONTHLY 



[May 



ot the same lengtli. Patagium incomplete but enveloping 

 three-fourths of the arms, with six rectilinear parallel 

 rows of chambers. 



Dimensions: Diameter of phacoid shell 0.12, of the 

 outer medullary shell 0.04, of the inner 0.015; lengtii 

 of the arms 0.18, basal breadth 0.06, distal breadth 10. 



Habitat. Fossil in the rocks of Barbados. 



Staurococcura cuneata, n. sp. 



Phacoid shell about three times as broad as the outer, 

 and eight times as broad as the inner medullary sliell, 

 with seven pores on the radius. Arms wedge shaped, 



somewhat longer than the phacoid shell, with strong 

 pyramidal terminal spine at the distal end. Two of the 

 spines in one axis longer than the other two, nearly- 

 equaling in length the radius of the arras, and one of 

 them in line on one side with the side of the arm bearing 

 it. Patagium incomplete, enveloping only a small por- 



