234 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



i 2 . Cirri with 39-43 segments; 20 arms 80 mm. long; P a with 21 segments (Zan- 

 zibar) joubini (p. 312) 



g 2 . Cirri with the longest segments longer than, or at least as long as, broad. 

 h l . Longest cirri with 36-39 segments. 



i 1 . Outer cirrus segments only slightly broader than long. 



j l . PI only very slightly longer than PI and resembling it but with a few less 

 (25) segments which become more elongate distally; P 3 the largest and 

 longest pinnule, slightly stouter throughout than P 2 , with 22 segments; 

 24 arms about 85 mm. long (from Burma eastward to the Philippines; 



27-73 [789] meters) pulohra (p. 287) 



p. PI much longer than PI with about the same number (33-34) of segments; 



P 3 much shorter than P 2 , equaling PI in length, with 27 segments; 11-20 



arms 100-150 mm. long (Malacca Strait; 0-73 meters). singularis (p. 290) 



t a . Outer cirrus segments about twice as broad as long; Pz half again as long as 



PI, slender and flagellate distally, with 24 segments; P 3 slightly smaller than 



PI, but much larger than PI; 19 arms 80 mm. long (Zanzibar) _gravieri (p. 289) 



h 2 . Longest cirri with 31-36 segments. 



1 1 . Outer cirrus segments from half again to twice as broad as long; Pj and P 2 



similar and of the same length, 13 mm. long with 26 segments; P 3 shorter, 

 9 mm. long with 19 segments; 16-25 arms 110 mm. long (Pedro shoal, off 

 west coast of India) compta (p. 293) 



1 2 . Outer cirrus segments scarcely broader than long; PI 10 mm. long with 26-28 



segments; P 2 longer, 12 mm. long with 27 segments, and somewhat stouter; 

 P, similar to P a but very slightly larger and longer; 13-18 arms 65-130 



mm. long (Madagascar) madagascarensis (p. 295) 



e 1 . Enlarged proximal pinnules with a serrate profile, the distal ends of the component 

 segments armed with spines or bearing high keel-like processes on the outer ends of 

 the prismatic ridges. 



/'. Enlarged proximal pinnules stout, composed of cylindrical or only very slightly 

 prismatic segments which have everted and spinuos distal ends; disk more or less 

 extensively plated; 11-28 arms 50-140 mm. long; cirri with 16-38 (usually 30-35) 



segments (Amboina and the Aru Islands; 0-20 meters) variipinna (p. 278) 



/ 2 . Enlarged proximal pinnules sharply prismatic, with the distal portion of the 

 prismatic ridges on each segment extended outward in the form of high thin 

 rounded-triangular processes or broad blunt teeth. 



g l . Segments of the enlarged proximal pinnules with the distal portion of the prismatic 

 ridges produced into a high thin rounded-triangular process, so that the profiles 

 of these pinnules are very strongly serrate with conspicuous rounded teeth; 

 division series and arm bases very rugged, the component ossicles swollen dor- 

 sally, with prominent though rather broadly rounded synarthrial and articular 

 tubercles; 10-30 (usually between 11 and 22) arms 70-150 mm. long; cirri very 

 variable, with 25-46 (usually between 30 and 45) segments (from Philippines 

 to Andamans [possibly Maldives] and southward to northern Australia; 0-111 



meters) crenulata (p. 253) 



S*. Enlarged lower pinnules rather slender, becoming flagellate distally, the basal seg- 

 ments sharply carinate and the segments from the third outward with the entire 

 distal edge somewhat produced and overlapping, the outer portion of the pris- 

 matic ridges being produced into a blunt spine, which is directed obliquely for- 

 ward; cirri slender, 15 mm. long with 23-26 segments; 10-13 arms 50 mm. long 



(Singapore to Maldive Islands; littoral) producta (p. 275) 



n 2 . Brachials beyond the proximal fourth of the arms exceedingly short, discoidal, with the ends 

 parallel, the brachials within the proximal fourth of the arms also exceedingly short, with 

 parallel or slightly oblique ends. 



b 1 . IIIBr series present, all or mostly 4 (3 + 4); 18-27 arms (Andaman Islands to Kwala Cassan 

 and Java; littoral) philiberti (p. 3 1 3) 



