REPORT ON THE OPHIUROIDEA. 



217 



Table of Species of Ophiothrix — continued. 



Arm to disk 9:1. Radial shields small. Disk beset with minute I 



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

 rounded corners, . . . . . . . ) 



Arm to disk 9:1. Outer edge of upper arm* plates in three lobes. \ 



Upper disk naked, with numerous interbrachial radiating rows of > Ophiothrix triloba. 



CO 





o 







^ 

 >> 



— 



o 



scales 



I 



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



few (five to seven) radiating scale rows in each interbrachial > Ophiothrix propingua. 

 space, . . . . . . . . ) 



Arm to disk 15:1. Upper disk with a few rough grains. In each I „ , . ., . .,. 



.,•,,., i at c i i } Ophiothrix neri'tihna. 



interbrachial space only three or four large scales, . • ) 



Arm to disk 15-20 : 1. Large species. Upper disk densely set with ) n , . ,, . _ , , 



,i ■ T.ii'ii-T_i t '-'I'll I'll It I'l X lllltllTlMf'. 



thorny grains or stumps. Interbrachial sealing obscured, . . J x J 



Arm to disk 12 : 1. Disk above and below beset with tapering thorny ) ., , . .,. . , 

 spines, of which few or none on radial shields, . . . J 



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



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

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



Arm to disk 3 : 1. Upper arm plates narrow, swollen, oval. I n , . ,, . .„ 



T , , K * £ . } Oiihiiitlirix piiKilla. 



Lowest arm spine a hook, even at base of arm, . . . J x r 



CO 



>&1 



3 



Arm to disk 3£ : 1. Upper arm plates fan-shaped with inner ) 



ancrlo trmientpil T.nwpsf, nvm sninp. n. bnnV pvpti at bflsp. of \ 



angle truncated 

 arm 



Lowest arm spine a hook, even at base of V Ophiothrix exigua. 



. 



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



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

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



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



spines. Under arm plates cleanly curved without. Lowest arm \ Ophiothrix carinata. 

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



Arm to disk 7:1. Disk beset with slender trifid stumps. Under \ 



arm plates as broad as long, curved without, and with converging [• Ophiothrix ciliaris. 

 lateral sides, . . . . . . . ) 



Arm to disk 5 : 1. 



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



, . * , ... . . ■ i , .' \JllllllMll t't.i I'lllCllCl. 



truncated fan-shape, with arm spmes encroaching between t M 

 them, . . . . . . . . / 



Small short, stout stumps, with thorny crowns \ 



,rt, ( 



) iofh rix demessa. 



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

 with thorny heads. Similar stumps on upper arm plates, . / 



Upper arm plates with a longitudinal keel. Disk covering consists 1 



of minute cylinders. Arm spines with seven thorns on each > Ophiothrix parasita. 

 edge, . . . . . . . .) 



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



radiating rows of scales. Disk covering above, thorny stumps, > Ophiothrix hirsuta. 

 which lengthen below into short spines, . . . ) 



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



half grown?), but its stumps are scarcely thorny. The micro- > Ophiothrix punctolimbata. 

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



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



are about twenty radiating rows of scales in each interbrachial > Ophiothrix longipeda. 

 space, . . . . . . . ■ ) 



