138 THE AMERICAN MONTHLY [April 



these lenses, marked as I have indicated, on a triple or 

 quadruple nose-piece, is not only a pleasure, but a great 

 convenience. 



The accompanying illustration which is purely dia- 

 grammatical, represents a triple nose-piece with the ob- 

 jectives J, I and 1-5 attached removed from the body 

 tube. The nose-piece is so revolved that all the upper 

 surfaces of the lenses are visible, disclosing their desig- 

 nation. 



Radiolaria : A New Genus from Barbados. 



HARRY J. SUTTON. 



PHII.ADEI.PHIA, PA. 



Astrococcura. n. gen. 



Definition. — Coccodiscida with four chambered arms on 

 the margin of the circular or quadrangular disk, crossed 

 in two equatorial diameters, without a connecting pat- 

 agium. Medullary shell double. 



Astrococoura concinna, n. sp. 



Phacoid shell twice as broad as the outer and four 



times as broad as the inner medullary shell, with ten 

 pores on its radius, surrounded by one perfect chambered 

 ring. Arms fingered-shaped, as long as broad at the 

 base, at the rounded distal ends about three-fourths as 

 broad. 



