THE CRUSTACEA OF NEW JERSEY. 315 



— R. Rathbun, Rep. Fisher. Ind. U. S., I, 1884, p. 822. Freshwater 

 Creek, near Somers Point, New Jersey. 



— M. J. Rathbun, Bull. U. S. F. Com., XX, 1900 (1902), p. 100. Porto 

 Rico, and Katama Bay, Mass. 



— Paulmier, 58th An. Rep. N. Y. State Mus., VI, 1904, p. 133. Great 



South Bay and Hudson River, N. Y. 

 Peneus braziliensis Kingsley, Bull. Essex Inst., X, 1878, p. 69. New York to 



Brazil. 

 Kingsley, Amer. Nat., XXXIII, 1899, p. 719. Cape Cod to North 



Carolina and Florida regions. 

 Pmeus brasiliensis Kingsley, Proc. Acad. Nat. Sci. Phila., 1878, p. 330. New 



York to Brazil. 

 PencBus brasiliensis M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, 



1905, p. 19. (Massachusetts southward.) 

 Penceus braciliensis Mayer, Sea Shore Life, 1906, p. 91. New York to Brazil. 



Description. — Carapace moderate. Abdominal keel on fourth, 

 fifth and sixth segments sharp, and groove either side of latter. 

 High median keel reaches almost to hind edge of carapace, and 

 with deep broad groove either side extending parallel, also nearly 

 reaching hind edge of carapace. Posterior half of keel with 

 groove forming into double ridge. Front half of keel arched, 

 highest above orbit, with nine teeth, of which six on rostrum and 

 last nearly half way back on carapace. Ophthalmopod moderate. 

 Antennules with short stout hairy peduncles, which extend for- 

 ward far as, or slightly beyond, rostrum tip, and biramous slender 

 flagella equal or longer than peduncle. Antennae with very long 

 slender filamentous flagella, these often longer than body. Ros- 

 trum unarmed, becoming horizontal towards end, and two or 

 three denticles on lower edge. Antennal spine, hepatic spine, 

 carina and groove all well defined. Hepatic spine with partly 

 horizontal suture below. Cervical suture extends only half way 

 from hepatic spine to dorsal keel. Outer joint of mandibular palp 

 much larger than inner, very broad and not extended as narrow 

 tip. First maxilla with long endognath and also well segmented. 

 First maxilliped with slender four-segmented endopod, and 

 lamellar unsegmented exopod. First and second gnathopods 

 with well-developed epipods, and exopods large. Peraeopods all 

 with small exopods, and only first, second and third with epipods. 

 Pleopods all robust, well developed. Telson with deep median 



