REPOET ON THE OPHIUROIDEA. 



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Table of Species of OpMocnida. 



•One spiniform mouth papiUa on each side, and a bead-like pair at i o^,hiocnida putnami. 

 apex of mouth angle. Disk puffed, . . • • J 



Four to five mouth papillaj on each side. Two spiniform tentacle j_ g^j^-^^^^^i^ olivacea. 

 scales. Disk puffed, . . • • • • J 



Arm spines flat; one of them often with a terminal cross-piece. 

 Arms very long, ...•••• 



g^ I Arm spines rough. Four sharp mouth papilloe on each side. Two 

 spiniform tentacle scales, . . • • ' 



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\ OpMocnida hrachiata. 



> OpMocnida caribea. 



Lowest arm spine thick and rough. Two small mouth papillre on \ 



each side, and a bead-like pair at apex of mouth angle. Disk V OpMocnida scabra. 

 puffed, . . . . • • • • ' 



Lowest arm spine longest. One spiniform mouth papilla on each side, \ Qpi^iQc.nida pilosa. 

 and a bead-like pair at apex of mouth angle, . . • j 



■ Three blunt, nearly equal mouth papilla on each side. Disk scales ^^ q^^-^-^^^^^ scabrimcula. 

 thick, . . . . • • • • } 



g 

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Similar- to preceding, but disk spines longer, . 



Eadial shields very narrow, . . . • • 



One very wide mouth papilla on each side, and a clump of four 

 minute at apex of mouth angle, . . . ■ 



/ Two unequal mouth papillae on each side, and a pair at apex of mouth 

 Granules J angle, which are pointed and larger, 



on disk. ] 



\ Three nearly equal, bead-like mouth papillae on each side, 



OpMocnida Mspida. 



OpMocnida ecMnata. 



r ) 



V OpiMocnida ahiormis. 



> OpMocnida filogr 

 OpMocnida loveni. 



•anea. 



OpMocnida 2nlosa, Lym. (PL XIX. figs. 7-9). 



OpMocnida pilosa, Lym., Bull. Mus. Comp. Zool., vol. vi., part 2, p. 32, pi. xii. figs. 341-343, 

 1879. 



Disk scaling hidden. Disk set with stout simple spines. Five tapering arm spines, 

 the lowest one longest. A slender mouth papilla on each side, and a pair of thick ones 

 at apex of mouth angle, 



(Type specimen from Station 162.) Diameter of disk 5-2 mm. Arm broken, but 

 apparently eight or ten times the diameter of disk. Width of arm near disk r2 mm. 

 The short narrow mouth angle has at its base on either side a spiniform papilla, and at 

 its apex a pah-, stouter and more angular. Mouth shields longer than broad, nearly 

 oval. Side mouth shields triangular, somewhat curved round the mouth shield, not 

 meeting within. Under arm plates narrow, longer than broad, with eight sides, but 

 having the angles rounded and nearly obliterated ; lateral sides re-enteringly curved. 



