REPORT ON THE RADIOLARIA. 565 



Genus 246. Triopyle, 1 Haeckel, 1881, Prodromus, p. 464. 



Definition. Pylodiscida with a simple, spherical or lenticular, central chamber, 

 surrounded by three simple arm-chambers. Notches between the three arms transformed 

 into gates by a connecting equatorial girdle. 



The genus Triopyle differs from the preceding Triolene in the development of a 

 simple ring or latticed equatorial girdle, which connects the distal ends of the three 

 arm-chambers, and transforms the open notches between them into three gates. The 

 ring may be circular, triangular, or hexagonal. 



1. Triopyle circulus, n. sp. 



Disk circular, three times as broad as the hexagonal central chamber. Three arm-chambers 

 trapezoidal, at the convex distal end as broad, at the base half as broad as the three circular gates 

 between them. Surface smooth. No marginal spines on the girdle. 



Dimensions. Diameter of the disk 0'045, of the gates - 015. 



Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



2. Triopyle hexagona, n. sp. (PI. 48, fig. 13). 



Disk hexagonal, three times as broad as the circular central chamber. Three arm-chambers 

 trapezoidal, at the truncated distal end as broad, at the base half as broad as the three triangular 

 gates between them. Surface smooth. No marginal spines. 



Dimensions. Diameter of the disk 0'05, of the gates 0'02. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



3. Triopyle trigona, n. sp. 



Disk triangular, four tunes as broad as the circular central chamber. Three arm-chambers 

 nearly triangular, at the narrow base half as broad, at the distal end twice as broad as the circular 

 or roundish gates. Surface smooth. On the margin (in the equatorial plane) three strong 

 pyramidal spines (at the end of the arms). 



Dimensions. Diameter of the disk 0'04, of the gates 0'015. 



Habitat. Central Pacific, Station 274, depth 2750 fathoms. 



4. Triopyle cordigera, n. sp. 



Disk hexagonal, four times as broad as the hexagonal central chamber. Three arm-chambers 

 triangular, at the base half as broad as at the truncated distal end, about the same size as the 



1 Triopyle =With three gate-openings ; T{/, ru\n. 



