136 



BULLETIN OF THE 



OPHIOCAMAX* gen. nov. 



Disk beset with thorny spines or stumps, and covered by scales or irregular 

 plates and large radial shields. Besides teeth, there are tooth-papillaj and 

 mouth-papilloe, numerous, and all of the same spiue-shape ; they are arranged 

 in tufts on the mouth-frames and jaw-plate. The spiniform scales of the mouth- 

 tentacles are borne on the edge of a little supplementary plate in a way similar 

 to Opliioglypha. Numerous (9) thorny translucent arm-spines, arranged along 

 the sides of the side arm-plates, which are prominent, and meet nearly or 

 quite above and below. In each interbrachial space two genital openings, 

 which begin close outside the mouth-shield. 



OPHIACANTHA, 



TABLE OF SPECIES HEREIN DESCRIBED. 



Disk closely beset with grains 

 or minute tubercles. Arm- 

 spines smooth. 



( Four arm-spines, 

 lous. 



Disk minutely tubercu- ) q 



Disk beset -vrith short slender 

 spines. 



Seven slender translucent arm-spines. Some 

 smooth spines on disk. 



Ten arm-spines. Outer ends of radial shields 

 naked. 



Disk closely beset with short, smooth, stout spines, sometimes mingled with 

 grains. Eleven thorny arm-spines. Radial shields covered. 



Disk beset with small short stumps, or grains, bearing a crown of blunt thorns. 

 Six arm-spines, stout, opaque, and scarcely thorny. Slender tentacle-scales. 



Disk-spines with forked heads, and' covered 

 with thick skin. Arm-spines scarcely or not at 

 all thorny. One minute short tentacle-scale. 



Disk-spines simple. Arm-spines not thorny. 

 'One or two large long tentacle-scales 



Spines of disk and arms slender and translu- 

 cent. Arm-spines not thorny. Some thorny 

 stumps on disk. 



Disk beset with stout spines ; arms essenti.ally smooth, and about twelve times di- 

 ameter of disk. Radial shields partly naked, and making n.arrow radiatmg ridges. 



About eleven mouth-papillaj to each angle. Large tentacle-scales 



Seven mouth-papillse to each angle. Slender spiniform tentacle-scales .... 



Seven mouth-papillie. High disk-stumps, with thorny sides and ends. Arm- 

 spines feebly thorny. Six arms. 

 The lowest arm-spine thickened and curved 



Eight or more feebly thorny arm-spines. Side ami-platcs very prominent. Disk- 

 crochets rather stout 



Arm-spines very long, not thorny. Side arm-plates largo and swollen. Outer 

 side of under arm-jdates strongly cur\'ed 



Disk beset with minute grain-like stumps, bearing a crown of blunt, thorns. 

 Arm-Rpineg long, slender, translucent, thoniy ; mounted on very projecting side 

 ann-platcs, which meet above. 



tuberculosa. 



vepratica. 



granulosa. 



0. rosea. 

 0. 



imago, 

 sentosa. 

 stimulea. 

 segesta. 



Troscheli. 



cuspidata. 

 loiigidens. 



nodosa, 

 cornuta. 

 cosmica. 



leviifi^ina. 

 scrrata. 



6(pi^, snako ; nd/xa^, .stake. 



