EEPORT ON THE RADIOLAEIA. 551 



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



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



Four 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. DicraTiastrum 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 ; breadtli of the branches O'OV. 



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



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



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

 and two lateral (adradial) branches. 



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



Tricranastrum ivyvillei, Haeckel, 1879, Natiirl. Schopf ungsgesch. , js. 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 ui fig. 3, PL 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 cUstal 

 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 midcUe 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. 



