REPORT ON THE RADIOLARIA. 1433 



4. Tricolocapsa decandollei, n. sp. (PI. 66, fig. 4). 



Shell subovate, with two sharp strictures. Length of the three joints = 2:2:2, breadth = 

 3:4: 3'5. Cephalis campanulate. Thorax broader, ring-shaped. Abdomen inversely hemispheri- 

 cal. All three joints of the same length, thick-walled, with the same regular and peculiar reticula- 

 tion, the small circular pores being surrounded by square, elevated frames. 



Dimensions. Length of the three joints, a 0'07, b 0'07, c 0'07 ; breadth, a 010, b 014, c 012. 



Habitat. Western Tropical Pacific, Station 225, depth 4475 fathoms. 



Subgenus 2. Tricolocapsium, Haeckel. 

 Definition. Thorax much smaller than the abdomen. 



5. Tricolocapsa brownii, n. sp. 



Shell ovate, very thick- walled, with two indistinct strictures. Length of the three joints = 

 2 : 4 : 7, breadth = 3 : 7 : 10. Cephalis flat, hemispherical. Thorax truncate, conical. Abdomen 

 inflated, inversely hemispherical. Pores regular, circular, of the same breadth as the bars, hexagonally- 

 framed, twice as large in the abdomen as in the thorax. Basal pole rounded. 



Dimensions. Length of the three joints, a 0'02, b 0'04, c 0'07 ; breadth, a 0'03, b 0'07, c 01. 



Habitat. Fossil in Barbados. 



6. Tricolocapsa schleidenii, n. sp. (PI. 66, fig. 2). 



Shell subconical, with two deep strictures. Length of the three joints = 2:3:6, breadth = 

 3:5:6. Cephalis subspherical. Pores subregular, circular, arranged in transverse girdles, three 

 in the broad thorax, six in the subglobular abdomen. Basal pole rounded. 



Dimensions. Length of the three joints, a 0'02, b 0'03, c 0'06 ; breadth, a 0'03, b 0'05, c 0'06. 



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



Genus 625. Phrenocodon, 1 n. gen. 



Definition. T heocapsida (vel Tricyrtida eradiata clausa) with an apical horn, 

 and a lattice-plate between thorax and abdomen. 



The genus Phrenocodon differs from the two preceding genera in the remarkable 

 circumstance, that the basal lattice-plate closes not the terminal mouth itself, but the 



1 Phrenocodon = Bell with diaphragm; @t>>i>/, x,u^uu. 

 (ZOOL. CHALL. EXP. PAET XL. 1886.) Rr 180 



