.^18 THE VOYAGE OF H.M.S. CHALLENGER. 



5. Amphihrachium capitatum, n. sp. 



Both arms equal, club-shaiied, three times as long as broad, in the outer distal half tliickened, 

 three times as broad as at tlie narrow base ; on the distal end of each arm a strong, angular, 

 terminal spine. (The form of the arms like that of Stcphanastrum capitatum, PI. 44, fig. 1.) 



Dimensions. — Eadius of each arm 0'22, basal breadth 0-02, terminal breadth 0'06. 



Habitat. — Equatorial Atlantic, Station 347, surface. 



6. Amphihrachium armatiim, n. sp. 



Both arms equal, four times as long as broad, in the thickened distal part twice as broad as at the 

 base, thorny, with twenty to thirty larger spines on the distal end, and a very large pyramidal spine 

 in the longitudinal axis. (The form of the arms like that of the odd arm in Euchitonia carcimis, 

 PI. 43, fig. 10.) 



Dimensions. — Eadius of each arm 0*24, basal breadth 0'03, distal breadth 0'06. 



HaUtat.—lSoxth. Pacific, Station 244, depth 2900 fathoms. 



Subgenus 3. AmphihracJioma, Haeckel. 

 Definition. — Both arms of difterent size or form, without terminal spines. 



7. Amphihrachium indicum, u. sp. 



Both ai-ms club-shaped, but very diflerent in size and form ; larger arm three times as long and 

 twice as broad as the smaller arm; the larger with nine joints slowly increasing in size, the smaller 

 with foiu- joints, rapidly increasing ; the terminal joint three times as broad as the basal. Distal end 

 blunt, rounded, without spines. 



Dimensions. — Eadius of the larger arm 0"24, of the smaller O'OS; distal breadth of the former 

 0-06, of the latter Q-OS ; basal breadth 0-015. 



Habitat. — Indian Ocean, Ceylon, Haeckel, surface. 



Subgenus 4. Amp>hibrachura, Haeckel. 

 Definition. — Both arms of difterent size or form, with terminal spines. 



8. Amphihrachium clavula, n. sp. 



Both arms different in size and form ; larger arm club-shaped, four times as long as broad, at 

 the distal end three times as broad as at the base, and twice as long as the smaller arm, wliich 

 resembles a stalked knob, with thiu basal peduncle and spherical distal part. Ends of the two arms 



