108 



BULLETIN OF THE 



OPHIOMUSIUM. 



TABLE OF KNOWN SPECIES. 



Disk-scales numerous and rather flat, with a 

 large one on the margin. Two or three short 

 stout arm-spines. Side mouth-shields long and 

 large. 



Interbrachial space between radial shields oc- 

 cupied by two large plates. Papilla; along gen- 

 ital openings extending upward as a small arm- 

 comb. Four or five small arm-spines. 



PapilUe on genital openings extending upward 

 as a small arm-comb. Side mouth-.shielJs small 

 and short. Upper arm-plates comparatively 

 large, some of the basal ones inclining to hexag- 

 onal. Three or four small arm-spines. 



Disk thick. Side mouth-shields and under 

 arm-plates much swollen. Outer moutli-i)apilla? 

 much larger than inner. Genital papilUe large 

 and bead-like. Six or seven small arm-spines. 



Disk flat, covered with small imbricated 

 scales, which are nearly equal, except the mar- 

 ginal, which are larger. Ui)per arm-plates large, 

 the basal ones long hexagonal. 



Disk covered by thick skin ; its upper surface 

 occupied chiefly (and in half-grown specimens 

 almost entirely) by radial shields and large pri- 

 mary plates, with small scales between. Arms 

 even and cylindrical. Four minute rudimentary 

 ( arm-spines. 



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

 joining the mouth-shield. Genital scales wide. No under arm-plates 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 and 

 rounded. Upper arm- plates broad diamond-shape. 



Arms rather slender and taper- 

 ing ; cylindrical, or but sliglitly 

 wavy from the gentle swelling 

 of the side arm-plates. Upper 

 and under arm-plates persisting 

 nearly to end of arm ; but no 

 tentacles beyond third or fourth 

 under plate. Mouth-shields 

 small. Genital opening bounded 

 by small close-set papill<e. 



^0. ehurneum 

 Lyni. 



0. armigerum. 



Disk covered by large angular swollen plates, 

 of which the interbrachial marginal is largest. 

 Arms wide and thick, with side arm-plates much 

 swollen and rounded, and bearing a spine on 

 their upper surface. 



Upper disk-plates bearing 

 large tubercles. 



Upper disk-plates smooth. 



Four small, eqn.illy spaced arm-spines. Small upper 

 arm-plates. The great lower interbrachial 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 three others along the 

 margin. 



Two minute arm-spines set back from edge of plate. 

 Only one lower interbrachial plate. No upper arm-plates. 



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

 thick, separated by narrow grooves, and arranged above 

 like steps. Side arm-plates flaring a little outward. 



Two or three minute arm-spines. Disk-idates coarse, 

 swollen, and irregidar. Two or three marginal plates be- 

 sides the central one in the lower interbracliial space. 



Five short, sharp, well-marked arm-s])ines. The great 

 lower interbrachial plate is sejiarated by a square one from 

 the mouth-shield. Margin of disk set with small points. 



Genital scales mcetins on me- 

 fllan line of lower interbrachial 

 si>acc. 



First side nrm-platci meeting 

 in median line of lower inter- 

 brachial space. 



Most of the lower 

 interbrachial space 

 outside the mouth- 

 shlcld is occujiied 

 by broad genital ■ 

 scales and a great 

 central plate. No 

 under arm-jilates be- 

 yond the third. 



Basal side arm-plates verj' fl.at and wide, en- 

 croaching much on the interbrachial space, ancl 

 licarlng st^mt spinea on their outer edge. First ' 

 under arm-|ilate Hlmllar to those beyond, and 

 fumlahcU with a teutacle-scale. 



0. corticosum. 



0. cancellatum. 



0. archaster 

 - Wyv. Thom, 

 MS. 



0. lA/mani 

 "^ W'yv. Thom. 



^0. laqueatum. 



[ 0. acHferum 

 Lym. 



1 0. Liitkeni. 



0. validum 

 Ljn. 



► 0. simplex. 

 ■ 0. lunart. 



► 0. scdlare. 



[o. testudo 

 I Lym. 



>0. granosum. 



0. puhheVum 

 Wyv. Thom. 



> 0. Jlabellum. 



