564 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.38. 







spine. Distal angles of telson rectangular; inner spine more than 

 twice as long as outer spine. 



Length of body of ovigerous female 19.5 mm. 



The elongate antennular peduncles, which are about half as long as 

 carapace, serve to distinguish this form at once from the typical form j 

 of S. townsendi Coutiere." 



Type-locality. — Oyster beds of Matapalo (near Capon), January 23^ 

 1908. 



Type. -Cat. No. 40503, U.S.N.M. 



PENEUS STYLIROSTRIS (Stimpson.) 



Plate 53, fig. 2. 

 Perm- us stylirostris Stimpson, Ann. Lye. Nat. Hist. N. Y., vol. 10, 1871, p. L34. 



Body strongly compressed; carapace carinated; a spine on anterior 

 margin and one behind it; rostrum long and slender, reaching beyond 

 antennular peduncles, teeth 5 '■£*-, no teeth above near the extremity. 

 Eyes very large, sunk in the hollowed antennules. Antennular 

 flagella longer than peduncle; inner flagellum much longer than outer. I 

 Antennal flagella twice as long as body. Legs slender, first three I 

 pairs chelate. Fifth and sixth segments of abdomen carinate; telson I 

 narrow-triangular, furrowed, unarmed, greatly exceeded by appen-j 

 dages of sixth segment. 



Length about 15 cm., of Peruvian specimens 4 to 5 cm. 



From salt creeks al La Palisada near Tumbes, February 12, 1908. "Camerones del 

 Mar." 



Not previously known from Peru. 

 Distribution. — Panama ; Peru. 



PENEUS BREVIROSTRIS Kingsley. 



Plate 54, fig. 2. 



Peneas brevirostris Kingsley, Proc. Acad. Nat. Sci. Phila., 1S7S, p. 9S. 

 Penseus californiensis Holmes, Occas. Papers Cal. Acad. Sci., vol. 7, 1900, p. 218, j 

 pi. -1. figs. 04 (19. 



Similar to the preceding. The carina of the carapace is accented 

 by a groove, on either side extending its whole length ; on t he carapace, j 

 in addition to the two spines of P. stylirostris, there is a small marginal 

 spine above the eye and a short crest running back from it. Rostrum 

 shorter than antennular peduncles, teeth J, "^ a -, tip unarmed. An- i 

 tennular flagella scarcely longer than peduncle; inner flagellum 

 shorter than outer. Antennal flagellum not twice as long as body. 

 Fourth, fifth, and sixth segments of abdomen carinate. 



The body attains a length of 19 cm. Peruvian specimens are 

 about 11 cm. 



a Proc. U.S. .Nat. Mus., vol. 36, 1909, p. 32, text fig. 14. 





