REPORT ON THE RADIOLARIA. 1433 



4. Tricolocapsa decandollei, n. sp. (PI. QQ, 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, h 0-07, c 0-07 ; breadth, a 010, h 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 jomts, a 0-02, h 0-04, c 0-07 ; breadth, a O'OS, b 0-07, c 01. 



Habitat. — Fossil in Barbados. 



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



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

 3:5:6. Cephalis subspherieal. 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, I 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,^ n. gen. 



Definition. — Theocapsicla (vel Tricyrtida eradiata clausa) with an apical horn, 

 and a lattice-plate between thorax and abdomen. 



The genus Phrenocodon difi"ers from the two preceding genera in the remarkable 

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



1 Phrenocodon = 'Bt\i. with diaphiagm ; (pj^», kuouu. 



(ZOOL. CHALL. ESP. PAET XL. 1SS6.) El 180 



