6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Discussion. — This small, fragmented specimen, which lacks a telson 

 and raptorial claws, resembles M. pilaensis in most features, but 

 differs as follows: (1) the rostral plate is ovate rather than pentagonal 

 and is broadly rounded anterolaterally instead of angled; (2) there is 

 but one papilla on the antennal protopod; and (3) there is a small, 

 rounded lobe present between the spines of the basal prolongation of 

 the uropod. 



A small irregular area on the left side of the rostral plate indicates 

 that it has been damaged and a rostral spine may have been present. 



Because of its small size, poor condition, and apparent distinctness 

 from the other species of Manningia, it seems best not to discuss this 

 specimen under M. pilaensis but to treat it separately in order to call 

 attention to it. Additional specimens from the Gulf of Aden are 

 needed to determine the identity of this specimen. 



Distribution. — Known only from the single specimen collected at 

 Djibouti or Obock, French Somaliland, in the western Gulf of Aden. 



Manningia pilaensis (de Man) 



Figure 2 



Pseudosquilla pilaensis de Man, 1888, p. 296. — Bigelow, 1894, p. 499 [key only]. — 

 Kemp, 1913, p. 105.— Schmitt, 1929, p. 140, pi. 19, figs. 12-14.— Dollf us, 

 1938, p. 201, text-fig. 10.— Ingle, 1963, p. 22. 



Not Pseudosquilla pilaensis. — Nobili, 1906, p. 336 [= new species from Gulf 

 of Aden discussed above]. — Gravier, 1937, p. 193, text-fig. 13 [=M. serenei, 

 new species]. — Stephenson, 1953, p. 144. — Stephenson and McNeill, 1955, 

 p. 245 [= M. notialis Manning]. 



Manningia pilaensis. — Serfene, 1962, p. 20 et seq. [part]. — Manning, 1963, p. 

 313 [discussion]. 



Material. — 1 cf, 54.8;Liawutien, on mainland near Amoy, China; 

 May 27, 1923; S.F. Light, collector; USNM 62190. 1 cf , 61.7; Tsimei, 

 Amoy, China; S. F. Light, collector; BM(NH) Reg. No. 1924.5.27.2. 



Description. — Eyes not extending beyond midlength of first 

 segment of antennular peduncle; ocular scales low, rectangular, 

 partially fused along midline. 



Antennular peduncle more than % as long as carapace. 



Antennal scale not markedly curved, short, Uttle more than Y^ as 

 long as carapace, margins completely setose; antennal protopod with 

 one mesial and one ventral papilla. 



Rostral plate pentagonal, with long apical spine. 



Merus of raptorial claw %vith inferodistal spine. 



Fifth thoracic somite with inconspicuous lateral processes; sixth 

 and seventh somites wdth prominent lateral carina on each side; 

 last thoracic somite ^vith blunt lateral lobes; endopods of walking 

 legs increasing in length and slenderness posteriorly. 



