REPORT ON THE RADIOLARIA. 551 



3. Dicranastrum cornutum, n. sp. (PL 45, fig. 2). 



Hagiastrum cornutum, Haeckel, 1879, Atlas (pL xlv. fig. 2). 



Pour arms simply forked, four times as long as broad ; each arm with two triangular diverging 

 branches ending in strong conical spines. The simple basal part of " each arm about of the same 

 length as each branch of the distal part, twice as long as broad. Distance between the terminal 

 spines of each arm nearly as great as its length. 



Dimensions. Eadius of the arm 0'24, basal breadth 0'05 ; breadth across the bifurcation 012. 



Habitat. South Atlantic, Station 325, surface. 



4. Dicranastrum antilope, n. sp. 



Four arms simply forked, three times as long as broad; each arm with two lanceolate diverging 

 branches, ending in strong angular spines. The simple basal part of each arm is twice as long as each 

 branch of the distal part. Distance of the two terminal spines of each arm scarcely half as great as 

 its length. 



Dimensions. Eadius of the arm 0'32, basal breadth Oil ; breadth of the branches O'O 1 /. 



Habitat. Tropical Atlantic (off Ascension), Station 342, surface. 



Subgenus 2. Tricranastrum, Haeckel, 1881, Prodromus, p. 460. 



Definition. Each cross arm with three terminal branches, one middle (perradial) 

 and two lateral (adradial) branches. 



5. Dicranastrum wyvillei, n. sp. (PI. 47, fig. 3). 



Tricranastrum wyvillei, Haeckel, 1879, Natiirl. Schcipfungsgesch., p. 705, Taf. xvi. fig. 5. 



Arms trifid, one and a half times as long as broad ; each arm with three blunt terminal 

 branches of equal size. The simple basal part of each arm twice as long as the trifid distal part. 

 (The central capsule depicted in fig. 3, PI. 47, has the same form as the skeleton, and is only a little 

 smaller.) 



Dimensions. Eadius of the arm 0'4, basal breadth 012, greatest breadth (in the distal 

 part) 0-24. 



Habitat. Pacific, central area, Station 271, surface. 



6. Dicranastrum tricuspis, n. sp. 



Arms trifid, twice as long as broad ; each arm with three pointed terminal branches, ending in 

 strong conical spines, the middle branch somewhat larger than the other two. The simple basal part 

 of each arm three times as long as the trifid distal part. 



Dimensions. Eadius of the arm 0'3, basal breadth 0'06, greatest breadth (in their distal 

 part) 015. 



Habitat. North Pacific, Station 244, surface. 



