REPORT ON THE OPHIUROIDEA. 



217 



Table of Species of Ophiothrix — continued. 



' Arm to disk 9:1. Radial shields sraaU. Disk beset with minute | 



thorny stumps. Under arm plates much wider than long, with ^- Ophiothrix aspidota. 

 rounded corners, ...... 



Arm to disk 9:1. Outer edge 



Upiser disk naked, with numerous 

 scales, 



Arms to disk 9 : 1. Upper disk with a few rough grains. Only a ) 



few (five to seven) radiating scale rows in each interhiSichiaX \- Ophiothrix pirojmiqua. 

 space, . . . . . . . . j 



03 



i 



of upper arm plates in three lobes, j 



nerous interbrachial radiating rows of > Ophiothrix tri 



loha. 



Arm to disk 1.5:1. Upper disk with a few rough grains. In each 



Ophiothrix nereidina. 



irge species. Upper disk densely set with \ rt i ■ fi .■ . 

 s. Interbrachial scaling obscured, . . ) ^ 



gulatew. 



interbrachial space only three or four large scales, 



Arm to disk 15-20 : 1. Larg( 

 thorny grains or stumps. 



Arm to disk 12:1. Disk above and below beset with tapering thorny I /-, 7 • j? ■ • j 

 .,.,. i-ii-,j i-o ji Ophiothrix virqafa. 



spines, 01 which lew or none on radial shields, . . ■ ) 



Arm to disk 15:1. Only three to four radiating lines of scales in j 



each interbrachial space. A few stumps in centre of disk. At V Ophiothrix cataphracta. 

 each arm joint a double blue cross line, . . . . ) 



Arm to disk 3:1. Upper arm plates narrow, swollen, oval. I ,-, , • ,7 • -77 



T , . , i.i i t r ( Ophiothrix pusHla. 



Lowest arm sijine a hook, even at base 01 arm, . . . J -' ^ 



Arm to disk 3h : 1. 

 angle truncated. Lev 

 arm, 



Upper arm plates fan-shaped with inner \ 

 owest arm spine a hook, even at base of '• Ophiothrix exigua. 



CO < 



< 



Arm to disk 5:1. Disk covered with star-headed stumps, as in \ 



the two preceding, but with a few spines mingled. Under arm - Ophiothrix stelligera. 

 plates with outer side cleanly curved, . . . . j 



I Arm to disk 4 : 1. Disk beset with forked or trifid stumps without j 

 spines. Under arm plates cleanly curved without. Lowest arm ;- 

 spines a hook, even at base of arm, . . . . ) 



Arm to disk 7:1. DLsk beset with slender trifid stumj^s. Under ' 

 arm plates as broad as long, curved without, and with converging . 

 lateral sides, . . . . . . . ) 



Arm to disk 5 : I. Small short, stout stumps, with thorny crowns \ 

 on upper disk and radial shields. Upper arm plates short, ( 



Op)hiothrix carinata. 



Ophiothrix ciliarig. 



o 



truncated fan-sliape, Avith arm spines encroaching between C 

 them, . . . . . . . . / 



Ophiothrix rotata. 



Arm to disk 9-12:1. Disk covering consists of minute stumps, j^ .^^^^^,^.^, ^.^^^^^^^^,^,^_ 



with thorny heads, bimuar stumps on upper arm plates, . J 



Upper arm plates with a longitudinal keel. Disk covering consists j 



of minute cylindeis. Arm spines with seven thorns on each J Ophiutlirix paradta. 



edge. 



:) 



Arm to disk 9:1. In each interbrachial space are eight to fourteen j 



radiating rows of scales. Disk covering above, thorny stumps, :■ Ophiothrix iiirsutu. 

 which lengthen below into short sjjines, . . . j 



Arm to disk 13:1. Disk about as in Ophiothrix longipeda (same, \ 



half grown'), but its stumps are scarcely thorny. The micvo-,- Ophiothrix 2'tincfolimbata. 

 scopic tuberculation of upper arm plates is also finer, . . ) 



Arm to disk 18:1. Disk about as in Ophiothrix kirsuta, but there \ 



are about twenty radiating rows of scales in each interbrachial ,- OpiMothrix hmyipcda. 

 space, . . . . . • • • J 



