CHINOIDS OF THE SOLOMON ISLANDS — CLARK. 83 



on the fifth or sixth ; next three or four segments slightly 

 longer than broad, the following very gradually decreasing in 

 length and becoming about half again as broad as long distally. 

 The segments in the proximal half are slightly constricted centrally 

 with somewhat prominent ends, and those in the distal half are 

 slightly compressed laterally, and may be bluntly carinate ; 

 Opposing spine median to terminal, blunt, triangular, in height 

 equal to one quarter the lateral diameter of the penultimate 

 segment; terminal claw somewhat longer than the penultimate 

 segment, moderately slender, evenly tapering, and moderately 

 curved. 



Radials visible only in the angles of the calyx ; T Br 1 very 

 short, in contact basal ly, about four times as broad as long ; 

 I Br" (axillary) short and broad, almost triangular, twice as 

 broad as long, the lateral edges swollen and produced into 

 rounded lateral processes ; II Br-, the II Br 1 interiorly united for 

 about three-quarters of their length ; ossicles of the division 

 series and first brachials with rounded lateral processes ; the 

 III Br series are developed on three rays, always exteriorly. 



The twenty-four arms are about 120 mm. long; first two 

 brachials short, wedge shaped, twice as broad as long exteriorly, 

 the first inwardly united for most of its length ; third and 

 fourth brachials (syzygial pair) half again as broad as long; next 

 three brachials oblong, slightly over twice as broad as long, then 

 becoming wedge shaped and soon almost triangular, twice as 

 broad as long, and distally gradually becoming less and less 

 obliquely wedge-shaped, and in the terminal portion of the 

 arm about as long as broad. Syzygies occur between the third 

 and fourth brachials, again between the tenth and eleventh to 

 fifteenth and sixteenth (usually between the fourteenth and 

 •fifteenth or between the fifteenth and sixteenth) and distally at 

 intervals of from seven to ten (usually eight) oblique muscular 

 articulations. 



P 1 11 "5 mm. long, slender, evenly tapering and becoming very 

 slender distally, with twenty-three segments, the first about half 

 again as broad as long, the following gradually increasing in 

 length, becoming squarish on the third and twice as long as 

 broad, or somewhat longer distally; P 2 much stouter, stiff and 

 spinelike, 15 mm. long, with twelve segments, the first two sub- 

 equal, about half again as broad as long, the third half again 

 as long as broad, the remainder about two and one half times as 

 long as broad ; P 3 12 mm, long, resembling P 2 , with about ten 

 segments, of which the distal are much longer than those of the 



