44 BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



here recorded are from deep water at three points off the coasts of 

 Japan and from deep water off the coast of British Columbia. The 

 species is thus widely distributed in the deep waters of the Pacific 

 Ocean. C. egregia is also a Pacific species from waters of the East 

 Indian Archipelago. 



Remarks. — These specimens agree very closely with Faxon's de- 

 scription and figures. The number of spines among the setae of the 

 antennal scale varies from 8 to 10. In the male the basal portion of 

 the outer flagellum of the antennule (14 joints) is very considerably 

 thickened, and beyond it is a normal flagellum of 24 joints. From the 

 basal joint of the thickened flagellum on the right side is a dense tuft 

 of delicate plumose setae. It was not present on the left side, but it 

 may have been rubbed off. 



The immature male from Station 2859 has the large dorsal spine of 

 both the first and second abdominal somites bifid, as in C. egregia, 

 but otherwise this specimen appears to belong to C. spinosa. I could 

 detect no suture on the outer uropod marking off a distal portion. 

 Faxon says there is no suture in C. spinosa, but it is stated to be present 

 in G. egregia. The number of spines among the setae of the outer 

 uropod appears to be very variable. In the large adult male there 

 are 10, in the small male and in one of the females 6, and in the other 

 female I could not detect more than 3. 



The telson was not complete in any of the specimens, but it agreed 

 with Faxon's figure in that the apex is not shortly truncate as in 

 C. egregia but slightly before the apex gradually tapers to an apex 

 armed with two stout spines. 



The pleopods of the female are all uniramous and agree with 

 Faxon's figures except that neither of the fifth pairs had a lateral 

 branch. I think that the biramous fifth pleopod on one side only of 

 the type must be regarded as an abnormality. The pleopods of the 

 male agree in essentials with those in Hansenomysis, but the exopods 

 are longer and more slender than in that genus. 



C. spinosa is closely allied to C. egregia, but, according to Hansen's 

 description and figures (1910, p. 21, pi. 1, figs, ba-c; pi. 2, figs, la-d), 

 the latter species is to be distinguished by the truncate apex to the 

 telson and the suture on the outer uropod. The other characters 

 pointed out by Hansen as separating the two species were the num- 

 ber of spines on the antennal scale and uropods and the bifid char- 

 acter of the dorsal spine on both the first and second abdominal 

 somites. The latter character cannot be regarded as anything more 

 than a casual variation in the light of the small male specimen in this 

 collection. The number of spines on the scale and outer uropod, par- 

 ticularly the latter, would also seem to be subject to considerable 

 variation. The two species are very closely allied and more material 

 of C. egregia is necessary to determine their exact relationship. 



