8 



THE VOYAGE OF H.M.S. CHALLENGER. 







a § 



t^-d 



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 ai-m sjiines. Mouth 

 shields wider than long, . . . . • 



9. B 



'2 

 c2 



o 

 o 



w 

 a 

 z 



<=1 



O 



> Ophiura hrevicauda. 



V Ophiura guttata. 



\ Ophiura hrevispina. 

 . Ophiura variegata. 



> Ophiura hohnesi. 



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



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



, ,.,,.,, 11 \■^ \ Ophiura Icevis. 



Then Ophiura Icevis has no radial shields, or very small ones; whUe > ^ 



^ I Ophiura cinerea. 



Ophiura cinerea has them large and oval, . . . • •' 



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



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

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



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

 long as side arm plate, ..... 



Similar to preceeding, but with longer arm spines. 



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

 preceding, ....••• 



C 



Upper arm plates broken. Numerous small naked swollen plates midst 

 granulation of disk, ....•■• 



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

 naked, ...••••• 



> Ophiura wahlhcrgii. 



> Ophiura rubicimda. 



Upper arm plates entire. Large radial shields. Side mouth ^tields . ^^^ .^^^ ^^^^^^^^^^.^_ 

 granulated, . . . • • • • ' •' 



Upper arm plates broken. Eadial shields often whoUy or partly granulated. \ ^^ , .^^.^ 

 Side mouth shields granulated, . . . • • > 



teres. 



Kadial shields pai-tly covered. Under arm plates with a re-entering curve ) ^ ,,^.^^^ daniana. 

 without, . . . • • • • • •' 



•S. ® 



to ^ 



^ > 



■— o 



C3 



P3 



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



spines, 



'']Oph 



hmra appressa. 



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



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



