REPORT ON THE RADIOLARIA. 1687 



3. Castmiissa richardsi, n. sp. 



Pores subregular, circular, about as broad as the bars. Bristles twice as long as one pore. 

 Eadial main-siiines (about twenty) slender, cylindrical, irregularly curved, with dimpled surface (like 

 those in Tl. 113, fig. 5rt). Mouth with a corona of six stout, parallel, triangular teeth. 



Dimensions. — Diameter of tlie shell 0-3 to 0-35, of the pores 0-015. 



Habitat. — North Atlantic, Station 354, surface. 



4. Castanissa crosbiei, n. sp. 



Pores irregular, roundish, two to three times as broad as the bars. Bristles one-third as long 

 as the radius. Radial main-spines very numerous, straight, cylindrical, smooth, about as long as 

 the diameter of the shell. Mouth with ten or twelve irregular, conical, parallel teeth. 



Dimensions. — Diameter of the shell 0'2S, of the pores O'Cl to 0-015. 



Habitat. — North Pacific, Stations 231 to 235, surface. 



5. Castanissa macleani, n. sp. 



Pores irregular, roundish or polygonal, two to four times as broad as the bars. Bristles about 

 one-fourth as long as the radius. Piadial main-spines numerous, straight, conical, stout, with 

 dimpled surface, shorter than the radius. Mouth with six to eight irregular conical teeth. 



Dimensions. — Diameter of the shell 0-32, of the pores 0-012 to 0-024. 



Habitat. — Tropical Pacific, Station 268, depth 2900 fathoms. 



6. Castanissa hoylei, n. sp. 



Pores in-egular, polygonal, two to three times as broad as the bars. Bristles nearly half as 

 long as the radius. Radial maiu-spines (about thirty) very long and thin, cylindrical, in-egularly 

 curved, at the conical base inflated and fenestrated ; shell therefore slightly polyhedral. Mouth 

 with five strong conical teeth. 



Dimensions. — Diameter of the shell 0-35 to 0-4, of the pores 0-02 to 0-03. 



Habitat. — North Pacific, Station 245 to 250, surface. 



Genus 709. Castanopsls,'^ Haeckel, 1879, Sitzungsb. mecl.-nat. Gesellscli. 



Jena, Dec. 12, p. 5. 

 Definition. — Cast anel 1 ida with branched radial main-spines and a simple 

 smooth mouth. 



The genus Castanopsis differs from its ancestral form Castanidium in the ramifica- 

 tion of the radial main-spines ; the branches are usually very irregular and often partly 



1 Castanopsis = Shell similar to a chestnut ; xaaTauou, otpig. 



