OCR Text |
Show 662 MR. E. J. MIERS ON A COLLECTION OF [June 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, pl. xxxi. fig. 3 (1868). Hab. Peru (Lima) (Jelski). Also found in Chili. Dr. Semper is undoubtedly right in quoting ilf. 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. ceementarius the rostrum is entire below. The synonyms of this variety will run as follows :- Var. CEEMENTARIUS. Palcemon ceementarius, Poppig, Archiv f. Naturg. ii. p. 143 (1836) ; Nicolet, in Gay, Historia de Chile, Zool. iii. Crust, p. 219 (1849). Palcemon gaudichaudii, M.-Edw. & Lucas, in D'Orbigny, Voy. Amer. Merid. Zool. vi. Crust, p. 37, pl. xvii. fig. 2 (1843). Bithynis longimana, Philippi, Wiegm. Arch. f. Nat. xxvi. p. 161 (1860). Hab. Chili. E U R Y R H Y N C H U S , 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 with a small spine between the eyes and the rostrum, and another below the point of insertion of the peduncle of the antennse. Antennse 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-nidee 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 antennse 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. Antennse 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. |