REPORT ON THE OPHIUROIDEA. 



169 



Peristomial 

 plate. 



Spines. 



Radial f 

 shields. ( 



Genital plate 

 and scale. 



Teeth and f 

 tooth papillae. { 



Arm bones. < 



Ophioeoma miliaria. 



Thin, in three pieces, with a 

 crust over outer open angle 

 as in Ophiocamax. 



HoUow, round, standing on 

 outer edge of side arm 

 plate. 



Rounded. 



Plate flattened, with longish 

 head. Scale long and blade 

 shape. 



Teeth simple. 



Thin rim ; faces normal about 

 as in Ophioeoma. 



Ophioeoma anfaretica. 



Thick, in one or two pieces as 

 in Ophiaeantha. 



Hollow, round, standing on 

 outer edge of side arm 

 plate, but at an angle. 



Small, narrow, no scale rows 

 in any of the three species. 



The same. 



Teeth with few tooth papiUse. 



The same. 



Ophiocom,a nigra. 



Thick, in two pieces. 



Hollow, somewhat flat on 

 sides of side arm plate, and 

 at a right angle to arm. 



Scapula shape. 



The same. 



Teeth and many tooth papil- 

 lae as in true Ophioeo7na. 



The same. 



As well as I can judge from description and figures and my own notes, Ophioconis 

 forhesii would be of the same genus as Ophioeoma miliaria. Ophioeoma antarctica 

 differs in having arm spines at somewhat of an angle ; different peristomial plate and a 

 few tooth papillae. Ophioeoma yiigra differs as does Ophioeoma antarctica, and also in 

 numerous tooth papillae, and in spines at a right angle to the arm ; being in these two 

 respects a true Ophioeoma. All three species agree in — (1) hollow spines, (2) genital 

 plates, &c., (3) arm bones, (4) disk scaling and outer granulation. Ophioeoma nigra 

 differs from Ophioeoma in hollow spines ; in peristomial plate, and in radial shield 

 without any scale lines. 



See Plate XLII. figs 9-13. 



5 i 



CI 



o 



Table of Species of Ophioeoma. 



Arm spines ringed with darker and lighter, .... 



Ophioeoma seolopendri.im. 



Arm spines not ringed. Central disk scales much coarser and thicker than 1 ^ , 

 in the preceding, . . . . . . • J 



'iioeoma ennaceus. 



Doubtful species, 



f Ophioeoma wendtii. 



' \ Opihioeoma sehoenleini. 



hioeoma echinata. 



Upper arm spine swollen. Upper arm plates nan'ow. Mouth shields \ f, j 

 squarish, . . . . . . . • / 



Disk closely and finely granulated above and below (in other species scattered, \ /-> j ■ , _ j rptn'i 

 and almost none below). Upper arm plates regular and clean cut, . / ' -^ ' 



Doubtful species, ....... 



Arm spines regular, tapering, and pointed. Coloration variegated, . 



Ophioeoma squamata. 

 Opihioeoma inca. 



