163 
thirteenth, which is a more or less marked transition joint, decreas- 
ing in length, soon becoming as long as broad and continuing 
so to the end; joints beyond the transition joint with moderate 
sized blunt dorsal spines; opposing spine much larger than the 
spines on the preceding joints. 
Radials almost entirely concealed; IBr, short and band-like; 
IBr, (axillary) almost triangular, two or two and one half times 
as broad as long, IIBr 4 (3—- 4); IBr series and IIBr series 
as far as the base of Pp in close apposition and laterally flattened ; 
synarthrial tubercles rather prominent. 
Fourteen to eighteen arms 60 mm. long, the brachials very 
short, with, except for the first few discoidal brachials, strongly 
produced distal ends, 
Pn 7 mm. long, moderately stout basally but tapering rapidly 
in its proximal half, becoming slender and flagellate distally, with 
twenty-four joints, at first twice as broad as long or even broader, 
becoming squarish distally; the larger proximal joints are strongly 
keeled; P, similar to Pn, of the same length or slightly longer, 
of the same size basally, but tapering somewhat less rapidly; P, 
and P, the same, 9 mm. long, and about as stout as P, basally, 
but tapering much more gradually (hence appearing larger) and 
somewhat stiffened; they consist of twenty-four joints, at first 
broad, becoming squarish at about the middle of the pinnule, and 
elongate distally; the proximal joints are strongly carinate; P, of 
the same character as the preceding, but smaller, and only 6 mm. 
long; P, slender, small, and weak, 3 mm. long; following pinnules 
very slowly increasing in length, reaching 5 mm. distally. 
Colour (in spirits). — Dark brown. 
Singapore; April 20, 1906. Two specimens. 
This new species resembles H. gquinduplicava in the similarity 
in size of the lowest two pinnules on each ray; but it is at once 
distinguishable by its spinous eirrus joints, its strongly overlapping 
brachials, and the strong carination of the lower pinnules, which 
have very short instead of rather long joints. 
[3 åg 
