go PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



the five pairs of legs all extending in an anterior direction. A con- 

 siderable space separates the fifth pair of legs from the sixth pair. 

 The sixth pair of legs, as well as the seventh pair, are placed at the 

 posterior extremit}^ of the sixth and seventh segments, respectively. 

 The epimera of the first four segments are distinct as narrow ridges 

 on the lateral margins of each segment. The ovarian bosses are also 

 present on these segments. 



The abdomen is composed of six distinct segments, the first three 

 of which are provided with a pair of triramous pleopods, two dorsal 

 branches and one ventral Ijranch to each pleopod; the next two seg- 

 ments, the foiii'th and fifth, are each provided with a pair of t)iramous 

 pleopods, both branches of each pleopod Ijeing dorsal, the ventral 

 branch, corresponding to that of the first three segments, not being 

 represented; the sixth segment of the a})domen is furnislied with a 

 pair of simple, elongated iiropoda, equaling in length the dorsal 

 branches of the pleopoda of the other abdominal segments. 



The marsupium is composed of five pairs of lamelhe, the lamella? of 

 the fifth pair being ver}^ large and occupying ahiiost half of the 

 ventral side of the thorax. 



Male unknown. 



Only one specimen was collected by Dr. (1. Brown Goode at the 

 Bcrnuidas in 1S76-77. The parasite was found attached to CUihanarius 

 ti'lcolor. 



Type in the Peat)ody Museum, Yale University. 



This genus differs chiefly from Stegophry.rus Thompson, to which 

 it is closely related in having- the pleopoda of the fourth and fifth 

 alxlominal segments hiramous instead of triramous; in having the 

 uropoda long and leaf-like, similar in shape and size to the branches 

 of the pleopoda, while in Stegopliry.i'UK liyptlm^ the type species of 

 the genus, the uropoda are small, rounded, and knob-like, with a 

 minute conical prominence between them; and in not having the sixth 

 thoracic segment greatly longer than the others. 



ARGEIA PUGETTENSIS Dana. 



Argeia pugeUensis Dana, II. S. Expl. Exp. Crust., II, p. 804, pi. liii, fig. 7. — • 



Stimpson, Bost. Journ. Nat. Hist., VI, 1857, j^. 71. 

 ylrgfeia sp.? Calman, Ann. N. Y. Acad. Sci., XI, No. 13, 1898, p. 281. 

 Argeia pugetlensin ^n:\\ \-RV)iiOfi , Proc. U. S. Nat. Museum, XXI, 1899, p. 868. 



Locality. — On Crangon iiiunita Dana, at Puget Sound; off Cape 

 Beale, Vancouver Island. On Crangon alascoisls Lockington, off 

 Cape Seniavin, Alaska; at Davidson Bank, Alaska; east of Amak Island, 

 Alaska; off Cape Strogonoff, Alaska; northwest of Unimak Island, 

 Alaska; Kouloulak Bay, Alaska; off Columbia Kiver, Oregon; Gulf 

 of Georgia, British Columbia. On Crangon dalli Rathhun, South of 

 Amak Island, Alaska. On Crangon alascensls elongata Kathbun, off' 



