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PROCEEDINGS OF THE NATIONAL MUSEUM 



grooves forming irregular H, transverse groove of H distinct, ir- 

 regular. Ocular elements distinct, contiguous on median longi- 

 tudinal axis of body, in anterior third of cephalothorax. 



Free fourth pedigerous segment wedge shaped, distinctly separable 

 from genital segment ventrally, appearing fused dorsally. Genital 

 segment (fig. 46c) constricted anteriorly, with pair of lobate projec- 

 tions posteriorly, distinct from abdomen. Fifth legs (fig. 46c?) 



Figure 46. — Caligus bonito Wilson, 1905, female: a, dorsal view; b, posterior cephalothoracic 

 sinus, dorsal view. Ventral view: c, free fourth pedigerous segment, genital segment, 

 and anterior region of abdomen; d, right fifth leg; e, caudal ramus. 



minute, situated on ventral posterior lateral surface, consisting of 

 single, lightly plumose setule laterally, pair of lightly plumose setules 

 just medial to lateral setule. 



Abdomen 1-segmented, anterior half appearing swollen, degree of 

 swelling varying in 3 Hawaiian specimens. Posterior half of abdomen 

 rounded on dorsal posterior surface, with pair of concavities on ven- 



