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



Table of Species of Ophiothrix — continued. 



Disk beset with minute trifid stumps, among which a few Blender ] 



spines. Colour in alcohol, blue, or pale pink, with a light line - Ophiothrix angulata, 

 along upper arm, . . . . . . . ) 



Disk beset with slender spines. Colour in alcohol, blue or green, with | „ , . ,, . ...... 



„ , ., ,. r ' } Ophiothrix urxteJu. 



tine white cross-lines on arms, . . . . ■ ) 



Disk beset with thorny stumps and slender spines, or with either alone. 1 



Arm spines longer than in Ophiothrix angulata. Colour in alcohol, > Ophiothrix spiculata. 

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



A few slender spines on disk. Several thin lines alternately blue and ) „ , . ,, . , ., . . 

 ,., r - , > Ophiothrix trilnieata. 



white, running along upper arm, . . . . . j 1 



Similar to Ophiothrix spiculata, but under arm plates proportionately ) 



longer ; and the lowest arm spine keeps the form of a double hook J- Ophiothrix koreana. 

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



g Disk beset with coarse spines of several sizes. Arm spines stouter than ) „ . . ,, . 7 



f ■«,.,,. . f , ij ii i i Ophiothrix dumosa. 



g in Oplitothrix spiculata, and under arm plates more angular, . J r 



Large (disk 14 mm.). Arm spines rounded, stout, and tapering. Disk ) „ , . ,, . .. 



° , v ii.-ti.--i n • i Ophiothrix maqnifica. 



closely set with similar smaller spines, . . . . J 1 J J 



Disk with a few peg-like stumps. Upper arm plates hexagonal. Arm ) 



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

 upper arm, . . . . . . . | 



Eadial 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 ■ Ophiothrix triglochis. 

 not strongly thorned, . . . . . . . 1 



Disk as in Ophiothrix triglochis, but arm spines much flatter and more ] ,. , . , 7 . ., 



i. i.1. j j j i i Jin > Ophiothrix ccespitosa. 



toothed ; and under arm plates are curved outwardly, . . • j 



Eadial shields naked. Upper disk set with minute, smooth, cylinders. ) 



Seven nearly cylindrical, tapering arm spines, only a little thorny at V Ophiothrix ruidis. 

 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 berberis. 

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



Eadial shields naked. Upper arm spines club-ended. Arm to disk 7:1. ) 



Short spines on disk, which is spotted with black, and arms |- Ophiothrix spomjicola. 

 banded with same, . . . . . . j 



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 J- Ophiothrix melanostirta. 

 and curved without, ..... 



I 



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



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

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



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



cylindric shaft and thorny clubbed end. Lowest one a trifle > Ophiothrix martens!. 

 hooked. Arm to disk i\ :1, . . . . . ) 



Disk as in Ophiothrix martensi. Outer side of under arm plate \ 



re-enteringly curved. Most arm spines with brush like thorny J- Ophiothrix plana. 

 ends. Arms to disk 5:1, . . . . . .) 



