REPORT ON THE RADIOLARIA. 229 



umbel composed of iiiue to twelve curved branches of equal length, wliich are again ramified and 

 resemble the inflorescence of an umbelliferous plant, the distal ends of aU ramules faUing in a spherical 

 face. 



Dimensions. — Diameter of the shell 0'12, pores 0'006, bars 0'002 ; length of the spines 0'14, 

 breadth 0-002. 



Habitat. — South Atlantic, Station 325, surface. 



Subgenus 2. Elaphococculus, Haeckel. 

 Definition. — Pores of the shell irregular, of different size or form. 



5. Elaphococcus dichotomus, n. sp. 



Pores irregidar, polygonal, twice to four times as broad as the bars ; six to eight on the radius. 

 Thirty to sixty radial spines cylindrical, curved, as long as the shell diameter, simply forked at the 

 distal end ; both branches one-third as long as the undivided part. 



Dimensions. — Diameter of the shell 0'15, pores 0"007 to 0015, bars 0'00-i ; length of the spines 

 0-2, breadth 0-004 



Habitat. — Arctic Ocean, Greenland, surface (Koch). 



6. Elaphococcus umbellatus, n. sp. 



Pores irregular, roundish, or polygonal, twice to five times as broad as the bars ; six to eight on the 

 radius. Porty to sixty radial spines cyUndrical, curved, as long as the shell radius, ha-viug at the 

 distal end an iiTegular umbel, composed of six to twelve short branches, which are irregularly 

 ramified or forked. (Differs from the regular Elaphococcus timbelli/er mainly in the irregularity.) 



Dimensions. — Diameter of the sheU 0-14, pores 0-007 to 0-015, bars O'OOS ; length of the spines 

 0-12, breadth 0-01. 



HaMtat. — South-east Pacific (Juan Fernandez), Station 299, surface. 



7. Elaphococcus dry modes, n. sp. 



Pores irregular, roundish, little broader than the bars ; ten to twelve on the .radius. Eighty to 

 one hundred and twenty (or more) radial spines, cylindrical, three to four times as long as the shell 

 diameter, irregularly forked or repeatedly dichotomous (each spine with forty to sixty forked 

 branches) ; the cUstal ends of all branches fall in a spherical plane. (Differs from the regidar 

 Elaphococcus cervicornis mainly in the irregularity.) 



Dimensions. — Diameter of the shell 0-1, pores and bars 0-003 to 0-008 ; length of the spines 

 0-3 to 0-4, breadth 001. 



Habitat. — Arctic Ocean, Iceland (Steenstrup). 



