496 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



First antennae 1-segmented; second antennae sickle-shaped claws; 

 maxillipeds greatly enlarged, their basal segments covering the other 

 mouth parts; ovisacs cylindrical. 



Male. — Head fused with first segment and much larger than the 

 rest of the body, and covered with a carapace ; trunk very indistinctly 

 segmented ; no abdomen ; caudal rami long conical processes, divided 

 distally; no leg rudiments; antennae and mouth parts like those of 

 female, the maxillipeds relatively as large. A single species in the 

 present area. 



PSEUDOCHONDRACANTHUS DICERAUS Wilson 



FiGTJKE 297, a, 6 



Pseudochondracanthus diceraus Wilson, Proc. U. S. Nut. Mus., vol. 35, p. 436, pi. 

 67, figs. 11-17, 1908. 



Occv/rrence. — Both sexes were taken from the gills of the common 

 puffer {Sphoeroides maculatus) at Woods Hole, July, 1906. 



Distribution. — La Jolla, Calif. (Wilson). 



Color. — Body the color of transparent cartilage, except the coiled 

 oviducts, which are white and opaque ; eggs white, ripening into rose- 

 red or pink. 



Figure 297. — a, Pseudocliondracanthus diceraus, female, dorsal; 

 6, P. diceraus, male, lateral ; c, Chondracanthus cottunculi, 

 female, dorsal (after Rathbun) 



Female. — Head with a short blunt horn at each anterior corner, 

 extending laterally ; first antennae swollen at the base, narrowed dis- 

 tally, with two apical setae ; basal segments of second antennae tele- 

 scoped so that the claws seem directly articulated with the head. 

 Basal portion of maxilliped a flattened lamina, distal portion bi- 

 partite, the outer part with a stout apical claw, the inner part covered 

 with short spines. Total length, 3 mm. 



^a?e.— Carapace 3-lobed, the central lobe dorsal, the others lateral ; 

 body with marginal sinuses indicating segments but without any 



