242 bulletin: museum of compakative zoology. 



Himerometra acuta, sp. nov. 



Centro-dorsal discoidal or low-hemisplierical, bearing about thirty-five marginal 

 cirri ; these are 20 mm. long with twenty segments, about half of which are rather 

 longer than wide, the remainder squarish ; the terminal segments are rather 

 compressed laterally, and have a faiut dorsal keel passing into the spine of the 

 penultimate; radials just visible in the angles of the calyx; first costals short, 

 oblong, free laterally, furnished with a rounded lateral projection ; axillaries low 

 pentagonal, nearly twice as broad as long ; distichals two, articulated ; the junc- 

 tions of the costals, distichals, and lower brachials more or less tubercular, the 

 costals and distichals having rounded lateral projections ; twenty arms 85 mm. 

 to 90 mm. long, the first six brachials oblong, the following obliquely quadrate 

 (almost triangular), about half as long as wide, becoming less obliquely quadrate 

 and finally oblong distally ; first pinnule 4.5 mm. long, slender, weak, and tapering, 

 with twelve or thirteen segments, the first three short, the remainder becoming 

 progressively longer ; second pinnule 10 mm. long, much stouter than the first, 

 stiff and styliform, with fifteen segments, the first two wider than long, the 

 remainder elongated ; following pinnules shorter than the first, with about eight 

 segments, gradually increasing in length distally. 



Color (in formalin) yellow-brown, the skeleton dull yellow. 



Types Cat. 288 M. C. Z. from Fiji, collected November 25, 1897; four 

 specimens. 



This species comes nearest to Himerometra marginata (P. H. Carpenter) from 

 the Philippines, but the great enlargement of the second pinnule, which is 

 styliform, stiff, and rigid, serves to distinguish it at a glance. 



Himerometra heliaster, sp. nov. 



Centro-dorsal low-hemispherical or thick discoidal, bearing thirty to thirty-five 

 cirri in two or three more or less irregular marginal rows ; cirri 20 mm. to 23 mm. 

 long, with seventeen to twenty-three segments, mostly rather longer than broad, 

 the distal without dorsal spines ; opposing spine well developed ; terminal claw short 

 and curved ; radials concealed ; first costals narrow, oblong, about four times as 

 wide as long ; costal axillaries pentagonal, somewhat broader than long ; costals 

 rounded and widely free laterally, their junction slightly tubercular; distichals 

 and palmars 2, the axillary resembling the costal axillary, the preceding segment 

 like the first costal, but somewhat longer; twenty-five to thirty arms 125 mm. 

 long, the first five or six brachials oblong and slightly tubercular, then becoming 

 quadrate, nearly triangular at the seventh or eighth (much wider than long), 

 then becoming gradually less and less obliquely quadrate, and practically oblong 

 at the tips of the arms ; syzygia occur in the third brachials, again between the 

 sixteenth and twentieth, and distally at intervals of one to eleven (usually five or 

 six) ; first pinnule 9 mm. loug, slender and flagellate, with twenty-five segments, 

 the first three squarish, then gradually becoming elongated (about twice as 



