118 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



of Kauai, Hawaii (USFWS, HIMS cruise 39). Three females and 1 

 male (retained by author) from the gill cavity of K. pelamis (Linn- 

 aeus) captured at 20°41.5'N, 160°37.5'W (USFWS, HMS cruise 39, 

 station 17). Four females and 2 males (retained by author) from the 

 gill cavity of K. pelamis (Linnaeus) captured 120 miles north of Oahu, 

 Hawaii (USFWS). One female and 1 male (retained by auther) from 

 the external surface and gill cavity of K. pelamis (Linnaeus) captured 

 at 2°S, 132°W (USFWS, JRM cruise 34, station 5). 

 Measurements. — (In mm) 32 females and 22 males: 



female male 



mean 

 Total length, excluding caudal setae 

 Length of cephalothorax including frontal 



region 

 Width of cephalothorax 

 Length of genital segment 

 Width of genital segment 

 Length of abdomen 

 Length of caudal rami 

 Length of egg strings (17 strings) 



Description. — Female cephalothorax (fig. 43a) ovoid, consisting 

 of cephalon and first 4 thoracic segments. Frontal region approxi- 

 mately one-twelfth the length of cephalothorax, with membranous 

 margin along anterior edge; lunules extending the length of frontal 

 region. Lateral cephalothoracic margin slightly irregular, with mem- 

 brane extending laterally and second projecting medially, on ventral 

 surface ; small but distinct concavity present in posterior lateral surface. 

 Posterior sinus (fig. 43c) narrower at opening than medially, with 

 fine membrane along outer margin. Aledial posterior margin of 

 median cephalothoracic region smoothly convex, projecting poster- 

 iorly slightly past rounded lateral margins of median region and 

 slightly past posterior end of lateral cephalothoracic regions. Dorsal 

 cephalothoracic surface with numerous small, hairlike processes; 

 major dorsal grooves forming irregular H. Ocular region distinct, 

 in anterior third of cephalothorax; pigmented cups contiguous on 

 median longitudinal axis of body. 



Female free fourth pedigerous segment distinct from cephalothorax, 

 indistinctly separable from genital segment dorsally, distinctly sepa- 

 rable laterally and ventrally. Segment broad medially, in region of 

 fourth leg attachment, narrower anteriorly and posteriorly. Genital 

 segment (fig. 43d) with anterior end narrow, anterior lateral margins 

 convex; posterior lateral surfaces forming pair of posteriorly pro- 

 jecting lobes. Fifth legs (fig. 43/) not visible dorsally, situated on 

 lateral ventral surface, at base of lobes; consisting of pair of knobs, 

 outermost with single plumose setule, innermost with 2 plumose set- 



