8 



THE VOYAGE OF H.M.S. CHALLENGER. 



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Table of Species of Ophiura. 



(The granular covering on the radial shields and side mouth shields 



varies somewhat.) 



Disk thick, with large grains. 8-10 wide and short arm spines. Mouth- > 

 shields wider than long, . . . . . . J 



iwra brevicauda. 



Upper arm plates broken in numerous pieces. 9-10 slender arm spines, as 

 long as a side arm plate, ..... 



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 V Ophiura guttata. 



> Ophiura brevispina. 

 Ophiura variegata. 

 \ Ophiura holmesi. 

 Arms slender and tapering. 8-9 slender tapering, rounded arm spines, . Ophiura januarii. 



' Mouth shields ovoid in outline. 7-8 slender, spaced, arm spines nearly as 

 long as side arm plate, ...... 



Similar to proceeding, hut with longer arm spines, 



Large (disk 19 mm.), with thicker arms and disk than in the two 

 preceding, ........ 



3 



These two species, similar when adult, are quite different when young. \ 



Then Ophiura Icevis has no radial shields, or very small ones ; while > ™ "'" a cems ' 

 Ophiura cinerea has them large and oval, . . . J OP***™ 1 cmerea. 



Upper arm plates divided symmetrically into a number of scales, . Ophiurasquamosisdma. 



Upper arm plates broken. Numerous small naked swollen plates midst 

 granulation of disk, ....... 



i 



Upper arm plates entire. Mouth shields large. Side mouth shields 

 naked, ....... 



Upper arm plates entire. Large radial shields. Side mouth shields 

 granulated, ........ 



Upper arm plates broken. Eadial shields often wholly or partly granulated. 

 Side mouth shields granulated, ..... 



Radial shields partly covered. Under arm plates with a re-entering curve 

 without, ........ 



iura rubicunda. 



! panamensis. 



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Medium size (disk 16 mm.). Mouth shields wider than long. 8-9 arm 

 spines, ........ 



> Ophiura wahlbcrgii. 



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> Ophiu 



> Ophiura j 



> Ophill 



> Ophiura i 



ohiura teres. 



iura daniana. 



appressa. 



Large (disk 30 mm.). 7-8 broad, close-set arm spines, . . . Ophiura daps. 



Similar to Ophiura appressa, but occasionally with naked radial shields, . Ophiura tongana. 



