hi the Miisemn of the Smithsonian Institution. 133 



P. caramote in having tliree teeth on the inferior edge of tlie 

 rostrum. The number is, however, generally two, as in P. 

 setiferus. The chief difference is that pointed out by Gibbes ; — 

 the want of spines at the base of the third pair of feet. 



This species is often found in brackish water, and even as- 

 cends streams to points where the water is nearly or quite 

 fresh. It was thus found in the Croton River at Sing Sing by 

 Prof. Baird, and by myself in a fresh-water creek near Somers' 

 Point, N. J. Besides these localities there are specimens in 

 the Smithsonian collection from Great Egg Harbor, N. J. 

 (Baird), Charleston, S. C. (Gibbes), Tortugas, Fla. (White- 

 hurst), Pensacola, Fla. (Jeffrey), New Orleans (Couch), Brazos 

 Santiago, Tex. (Yan Yliet), and Brazil (A. H. Riise). 



Penaeus setiferus. 



Cancer setifenis Lin. , Syst. Nat. 



Penaeus fluviatilis Say, Jour. Acad. Nat. Sci., Philad. , I. 236. 

 Penaeus setiferus H. Milne-Edwards, Hist. Nat. des Crust., II, 414. Gibbes, 

 Proc. Am. Assoc. Adv. Sci., 1850, p. 199. 



The flagella of the antennulte in males differ from those of 

 females in being less tapering, naked, and armed with corneous 

 teeth like those of a file, which form spinules along the margin. 



In a specimen from Mobile Point, the rostrum is armed with 

 one tooth only on the inferior edge. 



Our specimens are from the following localities :— Norfolk, 

 Ya. (Farragut); Charleston, S. C. (Gibbes); Florida (Agassiz); 

 Mobile Point, Ala. (Wurdemann) ; Biloxi, Miss. (Bellman) ; 

 Calcasieu Pass, La,, and Galveston (Kennerly) ; St. Joseph's L, 

 Texas (Wurdemann); Brazos Santiago (Yan Yliet). 



Penaeus pubescent, nov. sp. 



Surface of thorax and abdomen short-pubescent. Lateral furrows 

 of carapax shallow and inconspicuous, being filled with pubescence ; 

 lateial spine acute. No trace of a longitudinal furrow on the dor- 

 sum. A sharp and rather long spine on the anterior margin at the 



