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



Species of Ophiomaza not herein described. 



Ojjhiomaza obscura, Lyni., Bull. Mus. Comp. Zool., vol. iii., part 10, p. 233. 



Ophiocnemis obscura, Ljn., Oph. Viv. Of. Kong. Akad. p. 333, 1866. 

 Singapore. 



O'phiothela. 

 OpMothela, Vll., Trans. Conn. Acad., vol. i., 1867. 



Disk covered by very large naked radial shields and a few irregular scales. Numerous 

 crowded tooth papillfe forming an irregular vertical oval. Teeth. No mouth papillae. 

 Arm spines thorny, clubbed and very short, borne on pad-like side arm plates which 

 stand out free from the arm. Upper arm plates broken in irregular pieces, or represented 

 by several wart-like swellings. The base of the jaw is pierced with a vertical hole. 

 Interbrachial spaces somewhat swollen. Two large genital openings beginning outside 

 the mouth shields. 



The skeleton is like that of Ophiothrix. 



Table of Species of 02ihiotliela. 



Eadial shields large. Interbrachial spaces set with short, thick spines. Six arms ) 



whose upper surface bears grains or minute spmes, . . . .J OpMothela miraUlis. 



Radial shields large, and interbrachial spacas very narrow, and smooth or set with a \ 



few grains. Six arms, whose upper surface is sparsely granulated, . . J ^"'^'^ '^''^ aance. 



Disk above covered whoUy by largo smooth radial shields. Five arms which have a 1 



few warts or grains on their upper surface, . . . . . J 'y *• 



Disk covered by a thick skin, set with scattered grains which obscure the large radial ) 



shields. Six arms, whose upper surface bears larger and smaller grains, . . ) ^ * le a isi ico a. 



Disk with radial shields of moderate size, so that there is a free central space which \ 

 with the shields bears thorny grains ; and these are continued along the tops of I 

 the six arms, . . . . . . . . . ) 



Species of OpMothela not herein described. 



OpMothela mirabilis, Vll., Trans. Conn. Acad., vol. i. p. 268, 1867. 

 Panama Bay. 



OpMothela dance, Vll., Proc. Bost. Soc. Nat. Hist., vol. xii. p. 391, 1869. 

 Fiji Islands. 



OpMothela tigris, Lym., 111. Cat. Mus. Comp. Zool, No. vi. p. 10, pi. i. figs. 

 10-12, 1871. 



U.S. Pacific Exp. Expedition ? 



