REPORT ON THE ASTEROIDEA. 599 
mm. from the base. Beyond this the ray has a flattened or subdepressed appearance, the 
abactinal surface being convex, with a broad and somewhat indistinct median carination, 
the breadth being greater than the height. 
The disk is small and button-like in form, the abactinal surface being convex, flattened 
centrally, and gradually rounded at the margin down to the base of the rays, The abac- 
tinal surface is beset with robust imbricating plates, between which are interspaces punc- 
tured by two or three papule. The plates are irregularly convex abactinally, and each 
bears two or three short, moderately robust, tapering, pointed spinelets about 2 mm. in 
length, which.are near together at their bases, but radiate slightly apart, giving a decidedly 
echinulate appearance to the abactinal surface. The spinelets appear to be naked, and I 
have detected no pedicellariz upon the disk. The papule are delicate, elongate, and 
vermiform. The ovarial region at the base of the rays is covered with a thick coriaceous 
skin, underlaid with small imbricating calcareous plates and punctured by numerous 
widely spaced, generally distributed papule. The outer half, or even outer two-thirds, of 
the ovarial region is traversed by bands of small prominent imbricating plates, which 
bear isolated, robust, conical spinelets 2 to 3 mm. in length. The bands are about 5 mm. 
apart, and the ovarial region has consequently the appearance of being encompassed by 
five or six echinulate rings; on the actinal surface of the inner third of the ovarial region 
the plating is more compact and irregular, and the spinelets are irregularly distributed, 
but do not occur on the lateral wall of the ray. On some of these spines are traces of a 
membranous sheath with closely crowded small pedicellariz. The membrane between 
the echinulate rings is perfectly smooth and bears no pedicellarize or tegumentary spinelets. 
Beyond the ovarial region the abactinal surface of the ray is covered with a thin semi- 
transparent membrane, and the transverse rings are represented only by short lateral 
calcareous ridges, the component plates appearing to be more or less ankylosed, upon 
which are borne from four to six rather long spinelets invested with thick membranous 
sheaths, crowded with numerous microscopic pedicellarize. The spinelets in the middle of 
a series are generally slightly longer than the others, and may measure from 6 to 8 mm. 
in length; the uppermost spinelet is generally much less, and the smallest of the series. 
The lowest spinelet springs from a plate abutting on the adambulacral plates, and is the 
representative of the lateral or infero-marginal spine. It may measure 7 mm. in length, 
but is often less. The delicate membrane which covers the abactinal surface of the ray 
bears small round or irregular patches or sacculi crowded with microscopic pedicellariz, 
the patches, though isolated, being numerous and quite irregular in their disposition. 
There is no tendency whatever towards the formation of the elongate, saddle-like, saccular 
bands which occur in Brisinga generally. 
The ambulacral furrow is wide, measuring about 4 mm, at a part where the breadth 
of the ray is 8mm. The adambulacral plates, which form a narrow well-rounded margin 
to the furrow, are very short, only about 1 mm. in length, distinctly but not. widely 
