REPORT ON THE RADIOLARIA. 1035 



primary ring. The vertical axis of the slender ovate shell is much greater than the 

 transverse. The network is very delicate, with very small and numerous triangular 

 or polygonal pores. The central capsule encloses peculiar concrements (PI. 96, fig. 28). 



1. Cephalospyris cancellata, n. sp. (PI. 83, fig. 10). 



Shell slender ovate, two and a half times as long as broad, with deep sagittal stricture and 

 complete ring. Network very delicate, with very small and numerous, irregular polygonal pores. 

 The two large apical holes are separated by a latticed triangular sagittal septum, the apex of which 

 represents a rudimentary horn. Basal plate with two large collar holes. Three feet slightly 

 curved, divergent, about half as long as the breadth of the shell ; the caudal foot slender, mucli 

 thinner than the two stout pyramidal pectoral feet. 



Dimensions. Shell 0'32 long, 013 broad. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



2. Cephalospyris ovata, n. sp. 



Shell slender, ovate, twice as long as broad, with deep sagittal stricture and complete ring. 

 Network very delicate, with very small and numerous triangular pores (on both poles intermingled 

 with irregular polygonal pores). The two large apical holes are separated by a latticed triangular 

 sagittal septum, the upper edge of which is concave and bears two rudimentary horns. Basal plate 

 with four large collar holes. Three feet latticed, slightly curved, convergent, scarcely one-eighth as 

 long as the breadth of the shell. The central capsule filled up by concrements. 



Dimensions. Shell 0'32 long, 0'16 broad. 



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



3. Cephalospyris triangulata, n. sp. (PL 96, fig. 28). 



Shell ovate, one and a half times as long as broad, with deep sagittal stricture and complete 

 ring. Network very delicate and regular, with small triangular pores of equal size. The two lar^e 

 apical holes are separated by a latticed semilunar septum, the upper edge of which is concave, and 

 bears two rudimentary horns. Basal plate with three large collar holes (?). Three feet latticed, 

 conical, nearly parallel and vertical (the caudal curved), about half as long as the breadth of the 

 shell. The ovate central capsule contains peculiar amyloidal concentric concrements. 



Dimensions. Shell 0'2 long, 0'14 broad. 



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



Subfamily 2. DIPOSPYRIDA, Haeckel, 1881, Prodromus, p. 441. 



Definition. Zygospyrida dipoda, with two descending lateral basal feet 

 (probably corresponding to the pectoral feet of Cortina}. 



