662 MR. E. J. MIERS ON A COLLECTION OF [Jutie 19, 



(1837) ; Nicolet, in Gay, Historia de Chile, Zool. torn. iii. Crust. 

 p. 218 (1849) ; Semper, P. Z. S. p. 586 (1868). 



Macrobrachium africanum, Spence Bate, P. Z. S. p. 366, pi. xxxi. 

 fig. 3 (1868). 



Hab. Peru (Lima) (Jelski). Also found in Chili. 



Dr. Semper is undoubtedly right in quoting M. africanum, S. Bate, 

 as a synonym of this common American species. The rostrum has 

 generally two or three teeth on the lower margin ; but in the variety 

 described by Poeppig under the name of P. camentarius the rostrum 

 is entire below. The synonyms of this variety will run as follows : — 



Var. C^MENTARIUS. 



Palcemon ccsmentarius, Poppig, Archiv f. Naturg. ii. p. 143 

 (1836) ; Nicolet, in Gray, Historia de Chile, Zool. iii. Crust, p. 219 

 0849). 



Falcpmon gaudichaudii, M.-Edw. & Lucas, in D'Orbigny, Voy. 

 Amer. Merid. Zool. vi. Crust, p. 37, pi. xvii. fig. 2 (1843). 



Bithynis longimana, Philippi, Wiegm. Arch. f. Nat. xxvi. p. 161 

 (1860>. 



Hab. Chili. 



EuRYRHYNCHUs, gen. nov. 



Body not depressed. Rostrum triangular, broad at base, acute, 

 very short, barely reaching the extremity of the eyes. Anterior 

 margin of the carapace v/ith a small spine between the eyes and the 

 rostrum, and another below the point of insertion of the peduncle 

 of the antennae. Antennae with a small basal scale. Antennules 

 with three flagella. Outer maxillipeds slender. Second pair of legs 

 nearly as in Anchistia. Tarsi of the last three pairs of legs nearly 

 straight, acute. 



This genus is distinguished from others of the family Palcemo- 

 nidce with three flagella to the antennules by the very short broad 

 rostrum. It is perhaps most nearly allied to the genus Harpilius, 

 Dana, but differs in the form of the rostrum, and the basal scale of 

 the antennae is much shorter. 



EuRYRHYNCHus wRZESNiowsKii, sp. n. (Plate LXVII. fig. 2.) 

 Slender ; second segment of the abdomen considerably dilated on 

 the sides ; third to fifth segments with the postero-lateral angles 

 subacute, directed backward ; terminal segment longer than broad, 

 with the sides straight, rounded at the end, and, as well as the 

 appendages of the penultimate segment, ciliated at the extremity. 

 Antennules with the first exposed joint of the peduncle as long as 

 the two succeeding. Antennae with basal scale acute, rather longer 

 than the peduncle ; flagellum very slender. Anterior legs very slender ; 

 hand not as long as wrist, palm about equalling fingers in length. 

 Second pair of legs about twice as long as carapace ; arm about as 

 long as wrist, hand about twice as long as wrist, palm compressed, 

 fingers about as long as palm, straight, and closely meeting along 

 their inner edges. Length about 7| lines. 

 Hab. Cayenne. 



