114 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Female and male mandible (fig. 41o?) 4-parted, distalmost part 

 curved medially, with 12 denticulations along inner surface. Female 

 postantennal process (fig. 41o?) situated lateral to antennal base, con- 

 sisting of short, spinelike projection bearing pair of nodules on prox- 

 imal surface, third nodule present slightly posterior to base of projection, 

 all 3 nodules with several hairlike processes. Male postantennal 

 process (fig. 41g) also consisting of spinelike projection and 3 

 nodules although projection much longer and strongly curved. Fe- 

 male and male postoral process (fig. 41c^) spinelike, elongate. Female 

 and male maxillule (fig. 41d) nodular, with 3 setules distally. Female 

 and male maxilla (fig. 41^) 2-segmented, situated lateral and slightly 

 posterior to postoral process. First segment more than four-fifths 

 the length of second; second segment elogate, with small, horseshoe- 

 shaped membrane from distal medial surface and 2 saber-shaped 

 terminal processes. Innermost terminal process slightly less than IK 

 times the length of outermost, bearing fine, filmy membrane along 

 inner margin; outermost with very finely frilled membrane along 

 both outer and inner margins. 



Female maxilliped (fig. 41A) 2-segmented, situated posterior and 

 slightly medial to maxilla base. First segment well developed, with 

 long, strongly curved proximal articulation and muscle attachment 

 projection. Second segment distinct from clawlike terminal process, 

 bearing setule-like accessory process on distal inner surface. Alale 

 maxilliped (fig. 4H) more strongly developed, proximal projection 

 of first segment shorter, inner medial surface of segment with small 

 nodes proximally, larger node distally (node spinehke on 1 maxilliped 

 of 1 of the 3 specimens); second segment and processes as in female. 

 Female and male sternal furca (fig. 4:lj) situated between and shghtly 

 posterior to maxilliped bases. Furca with slightly curved or straight 

 tines, arising from butterfly-shaped area of heavy sclerotization. 

 Second butterfly-shaped area present between interpodal plates of 

 first and second thoracic legs. 



For nature of legs and armature, see figure 42 and table 15. 



Discussion. — The Hawaiian specimens here described as C. 

 guadratus Shiino differ from Shiino's 1954c and 1959b description 

 as follows : 



1. The terminal process of the male antenna differs from that 

 shown by Shiino although he does not include a lateral view of this 

 structure in his figures. The terminal process of the Hawaiian 

 specimens more closely resembles that of C. kuroshio Shiino, 1959c, 

 although the characteristic denticulation of the outer margin of 

 the second segment of the endopodite of the second thoracic leg of 

 C. guadratus and the Hawaiian specimens is not indicated. The 



