64 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



The thoracic processes are not, however, in Argela of epinieral ori- 

 gin. The^' arise from the posterior portion of the segments, while 

 the epimera are phicecl above on the anterior 

 division of the segments. It is, therefore, 

 incorrect to speak of them as " lames pleu- 

 rales. '' 



In the adult, the pleopoda consist of five pairs 

 of double-branched appendages, the outer 

 branches being elongate, lamellar, attached on 

 the under side very near the edge of the seg- 

 ments, and extending as a border, together with 

 the uropoda, around the abdomen. The inner 

 branches are close together and more or less 

 rounded plates or lobes. Giard and Bonnier's 

 interpretation of these facts is different. They 

 consider the outer branches of the pleopoda 

 as the ''lames pleurales" of the abdominal 

 segments, but that this interpretation is un- 

 tenable can be clearly demonstrated from an 

 examination of specimens, when the manner 

 of attachment and place of origin of these outer lamellae can be 

 seen. 



The view taken in explanation of the abdominal appendages for 

 Argeia is in accord with that held by Hansen for ParargeiaJ'' 



Fio. 40.— .\rgeia pugettex- 



SIS, CRYPTONISCAN M ALE. 

 X 77t. 



ARGEIA DEPAUPERATA Stimpson. 



An/eia depduperata Stimpson, Bost. Journ. Nat. Hist., VI, 1857, ji. 71. — Ricii.\RD- 

 soN, Proc. U. S. Nat. Mus., XXI, 1899, p. 868. 



Locality. — San Francisco Bay, on Crangon fjYincistyyrum. 

 PARARGEIA ORNATA Hansen. 



Farnrgeia ornata Hansen, Bull. Mus. Comj). Zuol. Harvard College, XXXI, 

 1897, pp. 120-122, pi. VI, figs. 1, 2.— Richardson, Proc. U. S. Nat. Mus., XXI, 

 1899, p. 869. 



Locality. — Off Acapulco, Mexico, in the l)ranchial cavity of Sclero- 

 crangon procax Faxon. 



BOPYROIDES HIPPOLYTES (Kr^iyer). 



Bopyras hippolyir.s Kr0Yer, Gr0nlands Amfipoder, 1838, p. oOG (78), pi. iv, fig. 

 22; Monog. Fremst. Sla-gteu Hippolytes Nordeske Arter, 1842, p. 262; Voy. 

 eu Scand., Crust., 1849, pi. xxviii, fig. 2.— Edwards, Hist. Nat. des Crust., 

 Ill, 1840, p. 283.— Stimpson, Proc. Acad. Nat. Sci. Phila., 1863, p. 140. 



Bopyroides acutimarginatus Stimpson, Proc. Acad. Nat. Sci. Phila., 1864, p. 156. 



« Bull. Mus. Comp. Zool. Harvard College, XXXI, No. 5, Pt. 22. The Isopoda, 

 1897, p. 121. 



