Crustacea from the Gulf of Akaha, 409 



The synonyms of T. cymodoce^ as far as ascertained, will 

 run as follows : — 



Trapezia cymodoce. 



Cancer cytnodoce, Herbst, Naturg. Krabben, &c. iii. (2) p. 22, pi. li, 



fig. 5 (1801). 

 Trapezia dentifrons, Latreille, Encycl. M^th. x. p. 695 (1825): M.-Edw. 



Hist. Nat. Crust, i. p. 429 (1834). 

 Trapezia hirtipes, Jacq. & Lucas, Voy. Pole Sud, Zool. iii. Crust, p. 44, 



pi. iv. fig. 14 (1853). 

 Trapezia ccerulea, Heller, Sitzungsb. /. c. p. 348 (1861), nee RiippeU. 



In T. cymodoce the serratures on the anterior margin of the 

 arm are more numerous, and the tooth on the inner surface 

 of the wrist usually more marked than in T. ferruginea. 



Several other species have been described, which are pro- 

 bably synonymous with one or other of the above ; but further 

 examination is needed of the types. There is nothing in the 

 description of Latreille and Milne-Edwards to enable one to 

 say which species must be designated T. ferruginea \ and I 

 assign this name to the first-mentioned form only because it 

 is undoubtedly the one described as T. ferruginea by Heller. 



In like manner I am unable to decide from the descriptions 

 of Herbst and Gerstaecker to which species the tj'pical speci- 

 men of T. cymodoce from the East Indies is to be refeiTcd, 

 and conclude that it belongs to the second species only because 

 Herbst's figure represents the hand as strongly keeled above. 



I am not certain which species is intended by Hilgendorf 

 (Crust, in Van der Decken's 'Reisen in Ost-Afrika,' iii. (1) 

 p. 76, pi. ii. figs. 4, 6, 1869). His specimens were from Zan- 

 zibar. 



Ocypode cegyptiaca. 



Ocypode (sgypliaca, Gerstaecker, Archiv f. Naturg. xxii. p. 134 (1856); 

 Heller, Sitzungsb. xliii. (1) p. 361 (1861) ; Plofimaun in Rechercliea 

 Faune Madagascar, &c. Crust, p. 14 (1874). 



One specimen (a male) was collected, and, unfortunately, in 

 a mutilated condition : the styliform prolongations of the eye- 

 peduncles, which vary greatly in length and shape, are, in this 

 specimen, strongly arcuated and very slender ; and the charac- 

 teristic patch of thick hair on the under surface of the penul- 

 timate joint of the second legs is nearly obliterated. The 

 examination of a considerable series of specimens evidences 

 the distinctness of this species from the closely allied 0. cera^ 

 tophthalma, Pallas. Ocypode cegyptiaca^ beyond the limits of 

 the Red Sea, has only been recorded from the island of Nossy 

 Faly, near Madagascar ; but the series in the British-Museum 

 collection shows that 0. ceratophtJialma is distributed through- 



