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



Table of Species of Ophiotlirix — continued. 





pel 



' Disk beset with minute trifid stumps, among whicli a few slender \ 



spines. Colour in alcoliol, blue, or pale pink, with a light line ■ Ophiothrix angulata. 

 along ujiper arm, ....... j 



Disk beset with slender spines. Colour in alcoliol, blue or green, with I ^ x . ., . - j j.- 

 „ , ., ,. ^ ' } Ophtomnx ursteait. 



nne white cross-lines on arms, . . . . -J 



Disk beset with thorny stumps and slender spines, or with either alone. \ 



Ai'in spines longer than in Ophiothrix angulata. Colour in alcohol, V Opldothrix spiculata. 

 pale blue, . . . . . . . . ) 



A few slender spines on disk. Several thin lines alternately blue and 1 /-, , . ,, . . -y . 

 , ., -K , t Opliwtlirix trmneatu. 



white, running along upper arm, . . . . . J -^ 



Similar to Opldothrix spiculata, but under arm plates proportionately \ 



Ifinger ; and the lowest arm spine keeps the form of a double hook :• Ophiotlirix Imreana. 

 till quite near the base of the arm, . . . . ) 



S S 



o ^1 



> 



M CD 



Disk beset with coarse spines of several sizes. Arm spines stouter than 

 in Ophiotlirix qiiriilata, and under arm plates more angular. 



Ophiotlirix dumosa. 



< 



Large (disk 14 mm.). Arm siiines rounded, stout, and taperma Disk 1 ^ , ■ .7 • -^ 



° / , , .,,' . ., ^ ,1 . ' ' Id V Oplnothnx maqmnca. 



closely set with similar smaller spines, . . . • J 



Disk with a few pegdike stumps. Upper arm plates hexagonal. Arm \ 



spines very stout. Colour in alcohol reddish, with black line along > Ophiothrix lineata. 

 ujjper arm, . . . . . . . ) 



Radial shields small and set, like disk, with small thorny stumps. Under \ 



arm plates with a re-entering curve on outer side. Arm spines thick and , Opihiothrix triglocliis. 

 not strongly tborned, . . . . . . . ) 



Disk as in Ophiothrix trinlochis, but arm spines much Hatter and more I ,, , • ,, ■ •, 



. ^1 1 ■' J 1 1 i 1^1, } Opliwtlirix aespitosa. 



toothed ; and under arm plates are curved outwardly, . . . J -^ ' 



Eadial shields naked. LTpper disk set with minute, smooth, cylinders. \ 



Seven nearly cylindrical, tapering arm spines, only a little thorny at > Ophiotlirix rudis. 

 the tip. Under arm plates covered without, . . . ■ ) 



Eadial shields and lower interbrachial spaces nearly naked ; rest of disk \ 



densely set with stumps bearing a crown of thorns. Outer side of under >- Ophiothrix berheris. 

 arm plates curved. Seven short, Hat, strongly toothed arm spines, . ) 





^ rS 





3 



M 



Eadial shields naked. Ujjper arm spines club-ended. Ann to disk 7:1. j 



Short spines on disk, which is spotted with black, and arms V Ophiothrix spoiujicola. 

 banded with same, . . . . . . ) 



Eadial shields naked. A few spines on disk. Arm spines with, shaft ^ 



smooth and a flat thorny end. Lower arm plates as broad as long V Ophiothrix melanostida. 

 and curved without, . . . . . . j 



Disk as in preceding. Arm spines with smooth shaft and rough end ; ] 



the second with a broadened flat, toothed end. Under arm plates V Ophiothrix striolata. 

 squarish with an outer re-entering curve, . . . . ) 



Disk naked above, spinous below. Upper arm spines with smooth \ 



cylitidric shaft and thorny clubbed end. Lowest one a trifle > Ophiothrix martensi. 

 hooked. Arm to disk 4|:1, . . . . .j 



Disk as in OjiJiiothrix marterisi. Outer side of under arm plate \ 



re-enteringly curved. Most a.rm spines with brush like thorny > Ophiothrix plana. 

 ends. x\rms to disk 5:1, . . . . . . j 



