REPORT ON THE RADIOLARIA. 229 



umbel composed of nine to twelve curved branches of equal length, which are again ramified and 

 resemble the inflorescence of an umbelliferous plant, the distal ends of all ramules falling in a spherical 

 face. 



Dimensions. Diameter of the shell 012, pores 0'006, bars 0'002 ; length of the spines 014, 

 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 dichotomies, n. sp. 



Pores irregular, 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 015, pores 0'007 to - 015, bars 0'004 ; 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. Forty to sixty radial spines cylindrical, curved, as long as the shell radius, having at the 

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

 ramified or forked. (Differs from the regular Elaphococcus umbellifer mainly in the irregularity.) 



Dimensions. Diameter of the shell 014, pores O'OOY to - 015, bars O'OOS ; length of the spines 

 012, breadth O'Ol. 



Habitat. 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 distal ends of all branches fall in a spherical plane. (Differs from the regular 

 Elaphococcus cervicornis mainly in the irregularity.) 



Dimensions. Diameter of the shell 01, pores and bars 0003 to O'OOS ; length of the spines 

 0-3 to 0-4, breadth O'Ol. 



Habitat. Arctic Ocean, Iceland (Steenstrup). 



