528 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



equal, while here the ovisacs are from three to five times as long as 

 the processes. 



Genus REBELULA Poche, 1902 



Fernale. — Head cylindrical, elongate, soft, and often transversely 

 wrinkled; neck narrow, cylindrical, fully chitinized, and anned at 

 its anterior end with chitin knobs, large processes, or branched horns. 

 Trunk heart-shaped, strongly depressed, its posterior corners broadly 

 rounded; a pair of small median lobes at the bases of the ovisacs. 

 Abdomen fused with the trunk and carrying a pair of posterior 

 processes covered with respiratory cylinders. First antennae and 

 first maxillae reduced to tiny knobs ; second antennae in the form of 

 spherical processes; second maxillae, maxillipeds, and swimming 

 legs obsolete in the matured adult. 



Male. — Head short, without a carapace, but with a large spherical 

 swelling on each side posteriorly; thorax distinctly segmented; no 

 abdomen but a pair of caudal rami. First antennae 3-segmented, the 

 end segment with four or five apical setae; second antennae 4-seg- 

 mented with an apical claw, the second segment showing the rudi- 

 ments of an endopod ; first maxillae biramose, the rami 1-segmented ; 

 second maxillae and maxillipeds with their basipod segments com- 

 pletely fused, the rami separate with stout apical claws. 



KEY TO THE SPECIES (FEMAIES) 



1. Neck filose, straight, armed at anterior end witli 3 or 4 short 



processes more or less spherical bouvieri (p. 528) 



Neck stout, twisted and wrinkled, armed at anterior end with 



small irregular knobs gracilis (p. 529) 



REBELULA BOUVIERI (Quidor) 



Figure 313 



Eepatophilus houvieri Quidoe, Arch. Zool. Paris, ser. 5, vol. 10, p. xliii, figs. 



5, 6, 1912. 

 Reuelula 'bouvieri Wilson, Proc. U. S. Nat. Mus., vol. 55, p. 579, pis. 53, 54, 1919. 



OccuiTence. — Both sexes were taken from the flesh of the common 

 grenadier {Macroui^s hairdii)., captured off Marthas Vineyard. 



Distrihution. — Off the coast of New Jersey (Wilson). 



Color. — Body of preserved specimens a uniform yellowish gray. 



Female. — Head four times as long as wide, smooth, tapered ; cepha- 

 lon separated by a distinct groove ; neck filiform, one-third the diam- 

 eter of the head and armed at its anterior end with three spherical 

 processes, one dorsal and two lateral; trunk cordate with four pits 

 on each side of the dorsal and ventral surfaces, between the midline 

 and lateral margin, usually arranged two anterior and two posterior. 

 Ovisacs eight times as long as wide ; each posterior process with 40 

 to 50 respiratory cones. Length of head, of neck, and of trunk, each 

 10-15 nun. Ovisacs, 30-40 mm. long. 



