1878.] MR. E. J. MIERS ON THE PEN.EID.'E. 301 



Pen.eus INDICUS. 



Peneeus indicus, M.-Edw. Hist. Nat. Crust, ii. p. 415 (1837). 



Peneeus stylirostris, Stimpson, Ann. Lye. N. II. N.York x. p. 134 

 (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 consider- 

 ably 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 anten- 

 nal scale, and the dorsal carina is nearly obliterated. In one speci- 

 men, 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 speci- 

 mens, 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, pi. xlvi. fig. 2, P. ensis (1849); Dana, U.S. Expl. 

 Exp., Crust, i. p. 605, pi. xl. fig. 5 (1852). 



Specimens in the British-Museum collection from the Indian seas, 

 Calcutta, Ceylon, and Penang, agree with M.-Edwards's short de- 

 scription, 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 speci- 

 mens 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. 



Peneeus 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. 

 xlv. i. p. 423, pi. ii. fig. 49 (1862) ; Crust, sudl. Europa, p. 296, 

 pi. x. fig. 11 (1863). 



Peneeus lonyirostris, Lucas, Explor. Sci. Algerie Crust, p. 46, 

 pi. 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), subse- 

 quently described by Lucas, Ann. Soc. Ent. France, viii. p. 219 



