REPORT ON THE RADIOLARIA. 1351 



irregularly branched or arborescent in the distal half, with ten to thirty blunt, thickened or 

 papillate, terminal branches. 



Dimensions. — Length of three joints, a 002, b 0-04, c 008 ; breadth, a O'O-i, b O'OG, c 0-08. 



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



3. Thyrsocyrtis fu7'cata, n. sp. 



Shell ovate, thorny, with two slight strictures. Length of the three joints = 1:1:3, breadth = 

 1:2:3. Cephalis hemispherical, with a p}Tamidal smooth horn of twice the length. Pores of the 

 thorax and abdomen nearly equal, regular, circular, quincuncial. feet very broad, forked, about as 

 long as the abdomen, much divergent ; the outer fork -branch as long as the simple basal half of the 

 foot, and twice as long as the inner or axial branch. 



Dimensions. — Length of the three joints, a O'Oo, h 0-03, c 0-09 ; breadth, a 0-04, b 0-06, c 0-09. 



Habitat— Tvo\y\csl Atlantic, Station 338, depth 1990 fathoms. 



4. Thyrsocyrtis rhizopus, Haeckel. 



Podocijrtis rhizodon, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xv. fig. 2. 



Shell pear-shaped, smooth, with two slight strictures. Length of the three joints -=1:2:4, 

 breadth = 1:3:5. C'ephaHs ovate, with a stout, sword-shaped horn of the same length. Pores 

 regular, circular, twice as broad in the inflated abdomen as in the truncate, conical thorax. Feet 

 cylindrical, parallel, vertical, straight, divided at the distal end into two short fork -branches. 



Dimensions. — Length of the three joints, a Q-Q'2, b 0"04, c 0"08 ; breadth, a 0'02, h O^OG, c 0"1. 



Habitat — Fossil in Barbados. 



5. Thyrsocyrtis rhizopodium, n. sp. (PI. 68, fig. 8). 



Shell campanulate-conical, with deep collar, iDut without lumbar stricture. Length of the 

 three joints = 3 : 4 : 10, breadth = 4: 10 : 15. Cephalis subspherical, with a small conical horn of 

 the same length. Pores regular, circular, quincuncial, three to four times as large in the inflated 

 abdomen as in the truncate, conical thorax. Feet cylindrical, slightly divergent, about as long as 

 the abdomen, S-shaped, bent outwards, irregularly branched in the distal half, with tuberculate 

 terminal branches. 



Dimensions. — Length of the three joints, a 0-03, b 0'04, c 01 ; breadth, a 0'04, b O'l, c 015. 



Habitat. — Central Pacific, Station 266, depth 2750 fathoms. 



6. Thyrsocyrtis radicata, Haeckel. 



Podocyrtis radicata, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xiii. 

 fig. 5. 



Shell campanulate-conical, with two distinct strictures. Length of the three joints = 1:2:4, 

 breadth = 1:4:6. Cephalis subspherical, with a small conical horn of half the length. Pores regular, 



