544 BULLETIN 54, UNITP]D STATES NATIONAL MUSEUM. 



The lateral lamin.'e of the tirst five abdominal segments round in sections instead 

 of segmental as in the female, and considerably longer tlian the width of the seg- 

 ments to whicli they are attached." 



92. Genus ARGEIA Dana. 



Body of female asymmetrieal. 



Ovarian bosses present on the first four segments of the thorax. 

 P^pimera present on all the segments; on the tirst four segments they 

 are lateral to the ovarian ])osses, and arc in the form of narrow plates. 

 The posterior portion of the lateral margins, in all the segments, are 

 more or less produced, the length of the processes varying in each 

 individual. 



The segments of the abdomen are distinctly defined, and become 

 gradually but rapidly narrower to the sixth or terminal segment, which 

 is somewhat l)ilobed. 



The pleopoda are five pairs of double-branched appendages; the 

 outer branches are in the form of long, narrow lamelhv attached close 

 to the lateral margins of the segments and forming a border surround- 

 ing the abdomen. The inner branches are in the form of small, 

 rounded lamella?, decreasing in size from the first to the last. 



The uropoda are simple, in the form of two narrow, elongate 

 lamellre attached to the terminal segment and similar to the outer 

 branches of the pleopoda. 



All seven pairs of legs are present. 



The male has all the segments of the abdomen fused. The pleopoda 

 and uropoda are wanting. All seven segments of the thorax are 

 distinct. 



Branchial parasites. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS ARCJEIA. 



a. Thoracic processes present on all the segments. Head large. Inner branches of 

 all the pleopoda present. Incubatory lamellic do not completely cover the 

 marsupial pouch Argeia jmgdtenis Dana 



a^. Thoracic processes apparently absent on some of the anterior segments. Head 

 smaller than in A. 2Jii<j<'tlensis, and l)ilobate. Inner branches of the first three 

 pairs of pleopods present; others wanting Argeia jiauperata Stimpsou.^ 



ARGEIA PUGETTENSIS Dana. 



Argeid pngettemh Dana, U. S. Expl. Exp., Crust., XIV, 1853, p. 804, pi. uii, 

 fig. 7.— Stimpson, Bost. Jour. Nat. Hist, VI, 1857, p. 511. - 



Argda sp. ? Calman, Ann. N. Y. Acad. Sci., XI, 1898, p. 281. 



Argeia pugcUemis Richardson, Proc. U. S. Nat. Mus., XXI, 1899, p. 868; Ann. 

 Mag. Nat. Hist. (7), IV, 1899, p. 337; American Naturalist, XXXIV, 1900, 

 p. 308. 



«Proc. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 57. 



''The key is made from Stimjoson's diagnosis of Argeia pauperata. I have seen no 

 specimens of his species. 



