REPORT ON THE OPHIUROIDEA. 



179 



Table of Species of Ophiacantha. 



r Four arm sjiines. Disk minutely tuberculous, . 

 Disk closely beset with 



Ophiacantha fuherculosa. 



grains or minute I Seven slender translucent arm spines. Some smooth ) ^,.^^^^^^^^ ^^^^.^^^.^^_ 

 tubercles. Arm | "■ "- '"•'' ' 



spines smooth. 



spines on d 



lisk. 



[ Ten arm spines. Outer ends of radial shields naked, 



' Spines and grains on disk ; outer ends of radial shields ) q 

 naked ; numerous (16) mouth papillre, . • / 



Disk closely beset with 

 short smooth stout 

 spines, sometimes 

 mingled with grains. 1 Eight arm spines ; outer ends of radial shields naked, 



Arm spines not 

 thorny. 



Disk beset with small 

 short stumps or 



OjiJiiacanlha granulosa. 

 'Jiiacimf/i.a seiiafa. 



Ophiacantha speddbilis. 

 Ophiacantha rosea. 



Eleven arm spines. Radial shields covered, 



Seven mouth papillae in adult, and eleven or twelve arm 1 oyim^rm^Aa vimpara. 

 spines. Six or seven arms, . . . • ) 



Large tentacle scale. Five arms ; seven or eight arm spines, Ophiacantha hidentata. 



Cv T'm°spines ^ ^''^'-^ tentacle scale. Five arms ; six arm spines ; a lozenge 1 Ophiacantha placentigera. 

 tnorny. Aimspmes Hke raised figure at inner end of under arm plate, .j^ ^ ■' 



thorny. Arm spmes 

 stout, opaque, and 

 scarcely thorny. 



like raised figure at inner end of under arm plate, 



Large tentacle scale ; six arms ; seven arm spines, 



Slender tentacle scale ; six arm spines, . 



Diskevenlv -ranulate I ^'^''"^ ^°"S, slender, much flattened arm spines. Outer ) c,^,;„.„,^„^/,,, „^,,.^ 

 JJisK evemy gianuiaie. j ^outh papilla spatula shaped, . . .) ^ 



Ophiacantha anomala. 

 Op)hiacantha imago. 



' Disk spines with forked heads, and covered with thick \ 



skin. Arm spines scarcely or not at all thorny. One > Ophiacantha sndosa. 

 minute short tentacle scale, . . . ■) 



Disk beset with short 

 slender spines. 



Disk 

 two 



hiacantJia stimulea. 



k spines simple. Arm spines not thorny. One or ) ^ , ^. 

 ,vo large, long tentacle scales, . . . j 



Disk spines with forked heads. Arm spines slender and 1 t,^,;„-^,^„^/,„ echirndata. 

 thorny, . . . • • • ) 



Spines of disk and arms slender and tran.slucent Arm ) Qphiacantha sccjesta. 

 spines not thorny. Some thorny stumps on disk, . J 



■Arm spines flattened and serrated ) ^,.^^,^^^y^^ ^^.^.^.^^^^^ 

 on edges, . . .J 



Armspinessmooth,rounded,slender, ) Qphiacantha almormi^. 

 tapering, . . . ) 



Mouth angles elon- 

 gated, and bearing 

 twelve to fourteen 

 papillae. 



Disk beset with small 

 spines or grains. 

 Radial shields mak- 

 ing narrow radiat- - 

 ing ridges ; arms 

 long (8-12 times 

 diameter of disk). 



' Disk beset with stout spines, essentially smooth, and \ 



with grains. Arms about twelve times diameter of > Ophiacaiiika troscheli. 

 disk. Radial shields partly naked, . . .J 



Disk beset with thorny grains and spines. Radial shields ) ophiacantha sctosa. 

 covered, . . • • • • J 



Disk beset with thorny grains and spines over its whole ) Ophiacantlia smitti. 

 surface. Radial shields covered, . . .J 



