REPORT ON THE RADIOLARIA. 517 



Subgenus 1. Amphibrachella, Haeckel. 



Definition. Both arms equal, of the same form and size, blunt at the distal end, 

 without a terminal spine. 



1. Amphibrachium sponguroides, n. sp. 



Both opposite arms of the same form and size, nearly cylindrical, three times as long as broad, 

 with six to eight transverse septa or joints, at the distal end rounded, blunt, without a terminal 

 spine. 



Dimensions. Eadius of each arm 022, breadth 0'065. 



Habitat. Antarctic Ocean, Station 154, surface. 



2. Amphibrachium lanceolatum, n. sp. 



Both arms equal, lanceolate, in the middle part three times as broad as at the two ends, two 

 and a half times as long as broad, with eight to nine transverse septa, at the distal end blunt, 

 without a terminal spine. 



Dimensions. Eadius of each arm 03, greatest breadth O09. 



Habitat. Pacific, central area, Station 267, depth 2700 fathoms. 



3. Amphibrachium dilatatum, n. sp. (PI. 44, fig. 6). 



Both arms equal, trapezoidal, somewhat broader than long, on the convex distal end three times 

 as broad as on the narrow base, with five to six transverse septa, without a terminal spine. Central 

 disk large, somewhat irregular, with three to four rings, twice as broad as the base of the arms. 



Dimensions. Eadius of each arm 0'32, basal breadth 015, terminal breadth 0'44. 



Habitat. South Atlantic, oft* Patagonia, Station 319, surface. 



Subgenus 2. Amphibrachidium, Haeckel. 

 Definition. Both arms equal, of the same size and form, with terminal spines. 



4. Amphibrachium amphilonche, n. sp. 



Both arms equal, lanceolate, in the middle part four times as broad as at the two ends, twice as 

 long as broad; on the distal end of each arm is a long conical spine. 



Dimensions. Eadius of each arm (without terminal spine) 0'2, breadth 0'08. 

 Habitat. Pacific, central area, Station 271, depth 2425 fathoms. 



