REPORT ON THE RADIOLARIA. 1585 



tangentially expanded. The specimen figured, with expanded pseudopodia, red central capsule, and 

 green phteodium, was observed living by me in 1882 in Ceylon. 



Dimensions. Length of the tubes 1-0 to 2'0, breadth 0'02 to 0'03 ; branches 0'15 to 0'3. 



Habitat. Indian Ocean, Ceylon (south of Matura), Haeckel, surface. 



Subgenus 2. Auloceratium, Haeckel. 



Definition. Distal ends of the terminal branches with a spathilla, or a small corona 

 of radial, usually recurved teeth. 



6. Auloceros dicranaster, n. sp. (PI. 105, figs. 14, 15). 



Eadial tubes cylindrical, straight, equally broad. Terminal branches tangential, forked, expanded 

 horizontally, five to six times as long as the tube is broad ; their number is usually five (more 

 rarely four or six), and each is divided into two short, equal, divergent, secondary branches, armed 

 at the distal end with a spathilla of five or six unequal recurved teeth. 



Dimensions. Length of the tubes TO to 1'5, breadth O'Ol to 0'02 ; branches O'Oo to O'OS. 



Habitat. Xorth Pacific, Stations 244 to 252, depth 2050 to 3050 fathoms. 



7. Auloceros spathillastcr, n. sp. (PI. 102, fig. 12). 



Eadial tubes club-shaped or nearly cylindrical, straight, often thickened towards the distal end. 

 Terminal branches ascending, three to six, usually four, partly simple, partly forked, slightly curved. 

 The branches are from twice to three times as long as the tube is broad, and much thinner ; at the 

 distal end they are armed with a spathilla of five or six recurved teeth. 



Dimensions. Length of the tubes 2'0 to 2'5, breadth 0'02 to 0'03 ; branches 0'08 to 012. 



Habitat. South Atlantic, Station 319, depth 2425 fathoms. 



8. Auloceros arborescens, n. sp. (PI. 102, figs. 11, 13). 



Eadial tubes club-shaped, irregularly curved, thickened towards the distal end. Terminal 

 branches two opposite (rarely three or four), forked near the base, and either dichotomously or 

 more irregularly branched ; each tube bears fifteen to thirty, usually twenty to twenty-four, 

 secondary branches, which are irregularly curved, and armed at the distal end with a spathilla 

 of four to eight recurved teeth. The tubes are more richly branched than in the preceding, 

 smaller, closely allied species, and the branches are more flatly expanded. 



Dimensions. Length of the tubes 2'6 to 3'3, breadth 0'03 to 0'04 ; branches O'l to 0'2. 



Habitat. South Pacific, Stations 288 to 295, depth 1500 to 3000 fathoms. 



(ZOOL. CHALL. EXP. PART XL. 1886.) Rr 199 



