REPORT ON THE EADIOLARIA. 1581 



17. Aidographis tetrancistra , u. sp. (PI. 103, fig. 22). 



Eadial tubes slender, cylindrical, straight. Terminal branches four to six (usually four), eight 

 to ten times as long as the tube is broad, slightly curved and widely divergent, with a terminal 

 spathilla of four crossed recurved teeth. 



Dimensions. — Length of the tubes 0'5 to 0-7, breadth 001 ; branches 0'08 to 01. 



Hahitat. — South Pacific, Station 285, depth 2375 fathoms. 



18. Aulogvaphis hexancistra, u. sp. (PL 103, figs. 18, 19). 



Eadial tubes club-shaped, slightly curved, gradually thickened from the proximal to the distal 

 end. Terminal branches four to eight (usually six in the majority of tubes), widely divergent, 

 nearly straight, three to four times as long as the tube is broad, with a terminal spathilla of six 

 (rarely five) recurved teeth. 



Bimeifisions. — Length of the tubes 04 to 0-6, breadth O'Ol to 0-02 ; branches O'Ol to O'OS. 



Habitat. — Xorth Pacific, Stations 244 to 253, depth 2050 to 3125 fathoms. 



19. Aidographis polyancistra, n. sp. 



Eadial tubes club-shaped, straight, thickened towards the distal end. Terminal branches ten 

 to twenty, smooth, strongly curved, disposed in a corona, six to eight times as long as the tube is 

 broad, each with a terminal spathilla of eight to twelve radial teeth. 



Dimensions. — Length of the tubes 0'6 to 0-8, distal breadth 0'02 ; branches 012 to 016. 



Hahitat. — Tropical Atlantic, Station 347, depth 2250 fathoms. 



20. Aidograp)his asteriscus, u. sp. (PI. 103, fig. 24). 



Eadial tubes slender, cylindrical, straight, equally broad. Terminal branches six to nine, widely 

 divergent, disposed in a radiate corona around a central branch, which is the distal prolongation of 

 the tube itself. Each branch bears a stellate terminal spathilla, composed of ten to twenty conical 

 teeth, which radiate in all directions. 



Dimensions. — Length of the tubes O'o to 0'8, breadth 0'02 ; branches 0'06 to 0'09. 



Habitat. — South Atlantic, Station 318, depth 2040 fathoms. 



Subgenus 4. Aidograplionium, Haeckel. 



Definition. — Terminal branches of the radial tubes armed with numerous lateral 

 denticles, and with terminal spathillae (or whorls of small radial teeth). 



