RECORDS OF W.A. MUSEUM. 
[127 
edges are little, if any, shorter than those of the IBr.i, making with 
them a broadly obtuse angle. The IIBr. and fllBr. series are 2, 
and all of the latter are developed. 
There are forty arms (thirty-nine in the type) 95 mm. long, 
resembling those of other species of the genus ; there is little or no 
overlapping of the distal edges of the brachials. 
Pi is 14 mm. long with twenty-eight segments, of which the 
first two are greatly enlarged, over twice the breadth of the succeed- 
ing, with the distal edge more or less convex, the third or third and 
fourth are slightly broader than long, and the remainder are sub- 
equal, slightly longer than broad ; as a whole the pinnule is 
proportionately longer and somewhat stouter and stronger, than is 
usual in the genus. 
P2 is 18 mm. long and is composed of nineteen segments; it 
resembles P3 but is very slightly less stout. 
P3 is 19 mm. long, very stiff and spine-like, composed of 
nineteen segments of which the first two are broader than long, 
slightly enlarged, with distal carinate processes the edges of which 
are straight and parallel to the longitudinal axis of the pinnule or 
nearly so, the third is nearly as long as broad, and the following are 
elongate with, after the eighth, produced distal edges which at the 
prismatic angles are provided with prominent spines. 
P4 is 14 mm. long and is composed of fifteen segments ; it 
resembles P3, but is less stout and the two first segments are less 
enlarged. 
P5 is 10 mm. long, composed of twelve segments ; it is more 
slender than P4. 
The distal pinnules resemble those of the other species of the 
genus ; they are very sharply triangular in cross section and their 
ambulacra are provided with very highly developed side and 
covering plates ; they measure 9 mm. in length, and are composed 
of fifteen segments of which the terminal four or five, upon which 
the ambulacra! grooves do not extend, are abruptly smaller than 
the preceding. 
The color in life is white, with purple bars and blotches on the 
pinnules. 
The specimens other than the type, (i) Forty-two arms; 
there are two IVBr. series, both developed on the inner side of 
