Boone, Crustacea, Cruise of "Alva," 1931 157 



la-j. — Kemp, S., Mem. Asiatic Soc. Bengal, vol. VI, 19J6-25, 

 p. 255. 



Palaemon (Eupalaemon) carcinus, NOBILI, G., Ann. Mus. S. Nat. 

 Genova, ser. 2A, t. XX, 1899-1901, p. 236. 



Subgenus: Parapalaemon Ortmann 

 Palaemon (Paralaemon) aemulus Nobili 



Plate 40 



Type : Dr. Nobili's type series consisted of an adult male and 

 a female, collected at Gatavake, Paumotu Islands, and deposited 

 in the Paris Museum. 



Distribution : This species is known from the type locality, 

 Paumotu Islands (Nobili) ; and from ten localities in New Cale- 

 donia (Roux), to which the "Alva" specimen adds another, Nou- 

 mea, New Caledonia (Boone) . 



Material examined : One female, collected at New Caledonia, 

 September 19, 1931, by the "Alva." 



Technical description : Adult female, body length, rostrum 

 included, 110 millimeters. Carapace compact, smooth, rounded 

 on the posterior three-fifths, with the anterior two-fifths elevated 

 into the rostral carina ; its rostrum is about half as long as the 

 carapace with a distinct moderate double curvature, armed on 

 the upper margin with eight, and on the lower margin with five, 

 teeth, and with the carina of the fronto-orbital margin continu- 

 ous with a lateral carina on the rostrum which extends to about 

 the predistal upper tooth. The antennal spine is acute with its 

 buttress not quite reaching the margin and extending backward 

 a short distance as a carina; a second, smaller, but acute spine, 

 occurs immediately behind the first antennal spine. There is no 

 other hepatic spine but a small depression defines this region. 

 The anterolateral angle is slopingly rounded and the lateral mar- 

 gin is emphasized by a flat carina. The abdominal terga are com- 

 pact, smooth, the first five segments with the lateral margins 

 regularly rounded ; the postlateral angle of the sixth segment pro- 

 duced into an acute tooth outside of the base of the uropoda and 

 into a slightly less acute triangle above the base of the telson. 

 The telson is one and a half times as long as the sixth segment 

 and tapered, the apex is pointed and armed with a submedian pair 



