228 THE VOYAGE OF H.M.S. CHALLENGER. 



Ojyhiothrix comata, Mull. & Tr., Syst. Ast., p. 112, 1842; Lym., Bull. Mus. Comp. 

 ZooL, vol. iii., part 10, p. 233. 

 Locality unknown. 



Oj^hiothrix capensis, Ltk, Addit. 'ad Hist, part 3, pp. 59, 100, 1869. 

 Cape of Good Hope. 



Ojyhiothrix viricUalha, V, Mart., Monatsb. Konig. Akad. Berlin, p. 347, 1867. 

 China Sea ; 40 fathoms. 



02)hiothrix plana, Lym., Bull. Mus. Comp. Zool., vol. iii., part 10, p. 238, pi. iv. figs. 

 1-8, 1874. 



PhiUppines ; Macassar ; littoral. 



Ophiogymna. 



OpMogymna, Ljn., Om nagra nya arter, Of. Kong. Akad., 1866. 



Disk covered with a thick skin which hides all the radial shields except their outer 

 ends, and has embedded in it loose, ill-defined scales. Numerous crowded tooth papillaj, 

 forming a vertical oval. Teeth. No mouth papillae. Spines numerous (five to ten) 

 (often three times as long as the joints), flattened, more or less glassy, thorny, having a 

 central shaft with slender side spurs from it. A small spine-like tentacle scale. The 

 base of the jaw pierced with a hole, from a want of perfect union between the two pieces 

 of the mouth frames. Interbrachial spaces swelled out like lobes. Two genital openings 

 beginning outside the mouth shields. Outer arm joints with hooks. 



Li internal structure the genus docs not materially vary from Ophiothrix. 



Ophiogymna elegans, Ljn., Om nagra nya arter. Of Kong. Akad., p. 163, 1866 ; 

 Oph. Viv. Of. Kong. Akad., p. 333, 1866 ; Ltk, Addit. ad Hist., part 3, p. 60, 1869. 



Station 203.— October 31, 1874 ; lat. 11° 7' N., long. 123° 7' E. ; 12 to 20 fathoms ; 

 mud. 



Ophiocnemis. 

 OpMocnemis, Miill. & Tr., Syst. Ast., 1842. 



Disk covered by very large naked radial shields, and minute plates bearing numerous 

 grains. On the interbrachial spaces below, a fine sealing. Numerous crowded tooth 

 papillae forming a vertical oval. Teeth. No mouth papillae. Arm spines numerous, 

 rounded, microscopically fluted, not translucent, a little hollow in the centre. The base 



