268 MR. '\^^ peect sladen on the 



extremity. Breadth of a ray at the base about 11 millim. In- 

 terbrachial angle rounded. 



Supero-marginal plates small, 21 in number from the interbra- 

 chial line to the tip, about as higb as broad and slightly tumid ; 

 covered with papilliform granules, uniform in size and not very 

 closely placed. Fine cilia in the furrows between successive 

 plates. No spines or tubercles of any kind present on the supero- 

 marginal plates. 



Infero-marginal plates broader than high, the height being 

 proportionally greater than usual in the genus; they do not 

 extend beyond the level of the superior series, and form a gently 

 rounded curve onto the actinal surface. 



Marginal spines very small, short, straight, taper, and slightly 

 compressed ; four in number, placed close together in an oblique 

 line passing from the adoral extremity of the marginal end to the 

 aboral side of tbe plate, the third from the margin being the 

 longest ; the fourth spine is usually rather shorter than the 

 third, but sometimes equal. These spinelets, though not closely 

 appressed to the side of the ray, stand at an angle to the surface 

 and are directed somewhat upward and outward. Behind the 

 line of marginal spines is a line of small flattened spiniform 

 squamules, larger than tbe general squamules of the plates ; and 

 on the inner part of the ray one or two similar spinelets may be 

 found on the inner portion of the plate ; these, however, are 

 wanting on the outer part of tbe ray, and there are no spinelets 

 on the aboral side of the plate. The surface of the plate is 

 covered with short papillose spinelets rather than squamules, 

 which become longer, more delicate, and very numerous in the 

 furrows. 



Ambulacral spines delicate and of moderate length, all cylin- 

 drical and only slightly taper, forming three regular series, with 

 three spinelets in each. The inner series radiate well apart, and 

 th.e middle spinelet is longest. The spinelets of tbe second series 

 are all equal in length and slightly shorter than the inner series, 

 and are frequently placed in a somewhat oblique line. The outer 

 series are, perhaps, a trifle smaller than the second series, and do 

 not always stand in a regular line ; sometimes an additional spine- 

 let is present and sometimes only two. 



Ventral plates numerous, 20-30 being present in the interbra- 

 chial area, eacb bearing about 8-10 short delicate spinelets, rather 

 widely spaced and radiating apart, which gives an appearance 



