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Show 1878.] MR. E. J. MIERS O N THE PEN/EIDIE. 301 PENEEUS INDICUS. Peneeus indicus, M.-Edw. Hist. Nat. Crust, ii. p. 415 (1837). Peneeus stylirostris, Stimpson, Ann. Lye. N. H. N. York x. p. (1871). In specimens in the British-Museum collection from the Indian seas, Ceylon, and Chefoo, which I refer to this species, the first pair of legs are bispinose at base, the second pair unispinose, and the third pair unarmed ; there are no lateral marginal spines on the last postabdominal segment. The rostrum in young specimens considerably projects beyond the antennal scale, and the median dorsal carina reaches nearly to the posterior margin of the cephalothorax ; in adult specimens, however, the rostrum scarcely projects beyond the antennal scale, and the dorsal carina is nearly obliterated. In one specimen, fully adult, from Amoy, which is probably only a variety of this species, the rostrum is even shorter than the antennal scale, and |-dentate. I cannot find any valid characters by which to distinguish from this species the P. stylirostris, Stimpson, of Panama, of which specimens, from that locality, are in the British-Museum collection. PENEEUS MONOCEROS. Peneeus monoceros, Fabr. Ent. Syst. Suppl. p. 409 (1798) ; M.- Edw. Hist. Nat. Crust, ii. p. 415 (1837); De Haan, Faun. Japon. Crust, p. 192, pl. xlvi. fig. 2, P. ensis (1849); Dana, U.S. Expl. Exp., Crust, i. p. 605, pl. xl. fig. 5 (1852). Specimens in the British-Museum collection from the Indian seas, Calcutta, Ceylon, and Penang, agree with M.-Edwards's short description, and possess the diagnostic characters indicated by De Haan, but differ from De Haan's longer description in having no lateral marginal spines on the terminal segment. De Haan's specimens belong perhaps to a distinct species, in which case the name of P. ensis, as they are designated in the plate, would be applicable to them. PENJEUS MEMBRANACEUS. Peneeus membranaceus, Risso, Crust, des environs de Nice, p. 98 (1816) ; Hist. Nat. Eur. Merid. v. p. 68 (1826); M.-Edw. (part.), Hist. Nat. Crust, ii. p. 417 (1834); Heller, Sitz. Akad. Wissensch. xiv. i. p. 423, pl. ii. fig. 49 (1862) ; Crust, sudl. Europa, p. 296, pl. x. fig. 11 (1863). Peneeus longirostris, Lucas, Explor. Sci. Algerie Crust, p. 46, pl. iv. fig. 6 (1849). Peneeus bocagei, Johnson, Proc. Zool. Soc. p. 255 (1863), p. 900 (1867). See Johnson's remarks (P. Z. S. 1867, p. 900) on the complicated synonymy of this species. If Dr. Heller's views are correct, Milne- Edwards attributes to P. membranaceus some of the characters of the Solenocera siphonocera (Peneeus siphonocerus, Philippi), subsequently described by Lucas, Ann. Soc. Ent. France, viii. p. 219 |
