REPORT ON THE OPHIUROIDEA. 



86 



Table of Species of Ophiomusium — continued. 



Disk covered by large radial sMelds, and small irregular scales, among which the | ^ , . 



prijuary plates are scarcely conspicuous, . . . . /^ Ophiomusium planum. 



Several flat angular plates in lower interbrachial space besides the large one ) 



joining the mouth shield. Genital scales wide. No under arm plates > OpMomudum lymani. 

 beyond the second or third, ......) - 



Upper disk covered by large swollen radial shields, with minute imbricated ) 



scaling in centre. Arms wide and thick, with side arm plates much swollen \ Ophiomusium laqueatum. 

 and rounded. Upper arm plates broad diamond-shape, . . . j 



Disk covered by large angular swollen plates, 1 Upper disk plates bearing large ) ^ , . 



of which the interbrachial marginal is largest. tubercles, . . ° ] Ophiomimum acuferum. 



Aims wide and thick, with side arm plates \ 



much swollen and rounded, and bearing a | 



spine on their upper surface, . . J Upper disk plates smooth, . Ophiomusium liitkeni. 



Most of the lower interbrachial 

 space outside the mouth 

 shield is occupied by broad 

 genital scales and a great 

 central plate. No under 

 aim plates beyond the 

 third. 



Ophiomusium validum. 



Four small, equally spaced arm spines. Small " 

 upper arm plates. The great lower inter- 

 brachial plate has usually two, much smaller at 

 its outer corners, .... 



Two minute arm spines set low down. Besides \ 



the great interbrachial plate below, there are [> Ophiomiisium simplex. 

 three others along the margin, . . ) 



Two minute arm spines set back from edge of ) Q^j.^^jnusium lunare 

 plate. Only one lower interbrachial plate, . J ^ 



Three short, stout, well-defined arm spines. Disk 

 plates thick, separated by narrow grooves, and 

 arranged above like steps. Side arm plates 

 flarmg a little outward. 



Two or three minute arm spines. Disk plates 

 coarse, swoUen, and irregular. Two or three 

 marginal plates besides the central one in the 

 lower interbrachial space. 



Five short, sharp, well-marked arm spines. The 

 great lower interbrachial plate is separated by 

 a square one from the mouth shield. Margin 

 of disk set with small points, 



Ophiomitsium sealare. 



Ophiomusium testudo. 



Ophiomusium granosum. 



Basal side arm plates very flat and wide, en- 

 croaching much on the interbrachial space, 

 and bearing stout spines on their outer 

 edge. First under arm plate similar to 

 those beyond, and furnished with a ten- 

 tacle scale, .... 



Genital scales meeting on median ) Q^jj^,io^iusium pulehellum. 

 line of lower interbrachial space. J 



Fu'st side arm plates meeting in ~| 

 medianlineof lower interbrachial \ Ophiomusium flabellum. 

 space, . . . . ) 



Ophiomusium serratum, Lym. (PI. II. figs. 1-3 ; PI. XXXIX. fig. 10). 



Ophiomusium serratum, Lym., Bull Mus. Comp. Zool., vol. v., part 7, p. 109, pL i. figs. 23-25 ; 

 also part 9, p. 220, 1878. 



Arms rather slender and tapering, cylindrical or but slightly wavy. Upper and 



