NO. 22SG. THE NEW COPEPOD FAMILY SPHYRIIDAE— WILSON. 



579 



REBELUA BOUVIERI (Quidor). 



Plate 53, figs. 34-40; plate 54, figs. 41-44. 



Eepatophylus houvieri Quidok. Archiv. Zool.. Paris, sor. 5, vol. 10, 1912, 

 p. xliii, figs. 5 and 6, text. 



^/ost and record of specimeTin. — The collection of the National 

 Museum contains 25 females and 1 male of this species, all obtained 

 by the Bureau of Fisheries steamer Albatross from the common 

 rattail, Macrourus bairdii, of the deep Atlantic and numbered as 

 follows : 



The anterior portion of the parasite Avas buried in the flesh of 

 the host beside or behind the dorsal fin, with only the genital seg- 

 ment and egg strings visible. A large cyst was formed around the 

 head and neck, and in the case of No. 49748, whose host was only 7 

 inches in length, the cyst was so large that it bulged out on both sides 

 of the body. Quidor reported two specimens from the same host, 

 and this was true of No. 49750, but in all the other instances there was 

 but a single parasite on a host. 



Specific characters of female. — The cephalothorax of this species 

 is cylindrical, four times as long as wide, and tapers gradually toward 

 the tip. The surface is perfectly smooth and devoid of wrinkles. 

 Near the tip is a groove where all the longitudinal muscles are in- 

 terrupted, and which separates a terminal portion, of about the same 

 length and width, representing the head. The extreme anterior por- 

 tion of this head is again separated by a groove which extends from 

 the posterior base of the second antennae to the maxillipeds on the 

 ventral surface. The end of the head, distal to this groove, shows 

 five rounded processes, two dorsal, two ventral, and one median, akit 

 more or less fused together. 



