REPORT ON THE RADIOLARIA. 1429 



9. Theocapsa linncei, n. sp. (PI. 66, fig. 13). 



Shell slender, subcylindrical, rough, with two slight strictures. Length of the three joints = 

 1:3:6, breadth = 1:4:4. Cephalis hemispherical, with a pyramidal horn of twice the length 

 (sometimes, as in the specimen figured, one or two small accessory horns occur at its base). Thorax 

 hemispherical, thick-walled. Abdomen nearly cylindrical, twice as long as the thorax, thin-walled, 

 with a hemispherical, rounded basal pole. The specimen figured is an abnormal one, with some 

 deformities on the irregular abdomen ; in numerous other specimens the abdomen is cylindrical, 

 regular. Pores of the thorax and abdomen equal, very small and numerous, regular, circular, three 

 to four times as broad as the bars. 



Dimensions. Length of the three joints, a 0'02, b 005 to 0'06, c 01 to 012 ; breadth, a 0'03, 

 b 0-06 to 0-07, c O'OY to 0'08. 



Habitat. Cosmopolitan; Atlantic, Indian, and Pacific Oceans; many Stations at various depths. 



10. Theocapsa forskalii, n. sp. (PL 66, fig. 9). 



Shell slender, subcylindrical, smooth, with two slight strictures. Length of the three joints = 

 1:1:3, breadth = 1:2:2. Cephalis hemispherical, with a conical horn of half the length. 

 Abdomen three times as long as the thorax, of the same breadth, with the same irregular, roundish 

 pores, large and small intermingled. Basal pole rounded. 



Dimensions. Length of the three joints, a 0'02, b 0'03, c 0'09 ; breadth, a 0'03, b 0'06, c 0'06. 



Habitat. North Atlantic, Canary Islands, Station 353, depth 2965 fathoms. 



11. Theocapsa ivolffii, n. sp. (PL 66, fig. 14). 



Shell slender, spindle-shaped, very thick-walled, rough, without external strictures, but with 

 two broad internal girdles. Length of the three joints = 2 : 3 : 15, breadth = 4 : 5 : 7. Cephalis 

 with a short horn of the same length, conical. Abdomen five times as long as the thorax, with 

 the same subregular, circular pores. Basal pole inversely conical, with some larger, elongate pores. 



Dimensions. Length of the three joints, a 0'02, b 0'03, c 015 ; breadth, a 0'04, b 0'05, c 0'07. 



Habitat. Mediterranean, Crete, depth 1620 fathoms (Spratt). 



12. Theocapsa pallasii, n. sp. 



Shell subovate, thorny, with two slight strictures. Length of the three joints = 1:2:3, 

 breadth = 1:2:3. Cephalis ovate, with a pyramidal horn of the same length. Thorax and 

 abdomen with subregular, circular pores of medium size. Basal pole hemispherical. (Differs from 

 TJieocapsa mulleri, PI. 66, fig. 7, mainly in the larger number and smaller size of the regular, quin- 

 cuncial pores.) 



Dimensions. Length of the three joints, a 0'03, b 0'06, c 0'09 ; breadth, a 0'03, b 0'06, c 0'09. 



Habitat. Tropical Atlantic, Station 342, depth 1445 fathoms. 



