130 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lis 



Family Euryphoridae 



Alebion echinatus Capart? 1953 



Figures 33a-c, 34o-e, Z5a-g 



Alebion enchinatus Capart, 1953, p. 655, fig. 4. — Shiino, 1955a, p. 177, figs. 

 1-3.— Vaissiere, 1959, p. 544, fig. 5. 



Reported hosts. — Sphyma diplana, S. zygaena. 



Distribution. — Gulf of Senegal, Japan. 



Material. — One nonovigerous adult female (USNM 110817) col- 

 lected by the author from the external surface of a specimen of Galeo- 

 cerdo cuvier collected by Lester Zukeran in Kaneohe Bay, Oahu, 

 Hawaii. Two ovogerous and 1 nonovigerous adult females (USNM 

 110818) collected by the author from the external surface of a speci- 

 men of Sphyma lewini collected by Lester Zukeran in Kanoehe Bay, 

 Oahu, Hawaii. 



Measurements. — Four female specimens: 



Greatest length, excluding setae 



Greatest length of cephalothorax 



Greatest width of cephalothorax excluding 



marginal flange 

 Greatest length of genital segment excluding 



posterior processes 

 Greatest width of genital segment 

 Greatest length of genital segment processes 

 Greatest length of abdomen 

 Length of egg strings (2 specimens) 



Diagnostic description of female. — Cephalothorax (fig. 33a) 

 suborbicular, consisting of cephalic, maxilliped-bearing and first 

 three pedigerous segments. Frontal region distinct, with very 

 narrow, membranous flange projecting posteriorly from ventral- 

 lateral anterior surface; lateral cephalothoracic margins with sharp 

 indentation anteriorly, at junction with groove separating frontal 

 region from rest of cephalothorax. Lateral cephalothoracic margins 

 with membranous flange extending posteriorly, around posterior ex- 

 tensions of lateral cephalothoracic regions, terminating at beginning 

 of U-shaped posterior sinuses. Posterior sinuses each with heavily 

 sclerotized ridge along most of outer lateral margin, also with 2 mem- 

 branes, 1 extending posteriorly from outer posterior end of each sinus, 

 second extending along outer lateral margin (fig, 336). Posterior 

 end of median cephalothoracic region with 10 poorly sclerotized 

 spinules and pair of small, platelike projections dorsally, just medial 

 to spinules, projections covering lateral regions of short, necklike 

 extension joining free fom-th pedigerous segment with cephalothorax. 



