544 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The lateral laminae of the first five abdominal segments round in sections instead 

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

 ments to which they are attached." 



92. Genus ARGEIA Dana. 



Body of female asymmetrical. 



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

 Epimera present on all the segments; on the first four segments they 

 are lateral to the ovarian bosses, and are 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 bilobed. 



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

 outer branches are in the form of long, narrow lamella? 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 lamellae, decreasing in size from the first to the last. 



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

 lamella? 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 OP THE GENUS ARGEIA. 



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

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



marsupial pouch :. Argeid pugettenis Dana 



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

 smaller than in A. pugettensis, and bilobate. Inner branches of the first three 

 pairs of pleopods present; others wanting Argeia pauperata Stimpson. & 



ARGEIA PUGETTENSIS Dana. 



Argeia pugettemis DANA, U. S. Expl. Exp., Crust., XIV, 1853, p. 804, pi. LIII, 

 fig. 7. STIMPSON, Bost. Jour. Nat. Hist., VI, 1857, p. 511. 



Argtia sp.? CALMAN, Ann. N. Y. Acad. Sci., XI, 1898, p. 281. 



Argeia pugettensis 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. 



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

 specimens of his species. 



