South African Crustacea. 25 



1912. Aristeomorpha rostridentata, Kemp and Sewell, Eec. Indian 

 Mus., vol. 7, pt. 1, p. 17. 



The figure, natural size, in the Investigator Illustrations 

 would do service excellently for the South African specimen, 

 except that the latter is not quite so large, and that the last 

 three teeth on its rostrum are more widely spaced. Alcock's 

 description speaks of 10 or 11 carinal teeth. The figure shows 

 only 10, and of these the penultimate is obscure ; our specimen 

 has only 8. Bate in 1881 estimated the " flagellum of second 

 pair of antennae about six times the length of the animal " ; 

 in 1888 he reduces it to " about four times." In our specimen, 

 much as in that of the Investigator, it does not exhibit so 

 disproportionate a length, but it is imperfect. As in Bate's 

 figure, the second joint of the mandibular palp is not so long 

 as the first. The fourth and fifth peraeopods are remarkably 

 slender. Length of the animal from apex of rostrum to that 

 of telson about 5 inches or 125 mm. 



Bate was evidently inclined to remove this species from 

 Aristeus, since he observes that in that genus three teeth are 

 the almost constant armature of the rostrum, while here alone 

 a number of small teeth arm it to the apex, and that a small 

 tooth at the anterior extremity of the hepatic region, constant 

 in Penaeus, is absent in Aristeus in all species except 

 A. rostridentatus. 



Locality. Buffalo Eiver N. 15 miles (East London, Cape 

 Colony) ; depth 310 fathoms. A 1294. 



GEN. EUSICYONIA, nom. nov. 



1830. Sicyonia (preocc.), Milne-Edwards, Ann. Sci. Nat., vol. 19, 



p. 339. 

 1837. Milne-Edwards, Hist. Nat. Crust., vol. 2, pp. 405, 



408. 



1849. ,, de Haan. Crust. Japonica, decas 6, pp. 187, 189. 

 1888. Bate, Eep. Voy. Challenger, vol. 24, pp. 219, 292. 

 1895. Faxon, Mem. Mus. Comp. Zool., vol. 18, p. 179. 

 1901. Eathbun, Bull. U.S. Fish. Comrn., 1900, vol. 2, 



pp. 100, 103. 



1906. Eathbun, Bull. U.S. Fish. Comrn., 1903, p. 908. 

 1911. de Man, Siboga Exp., vol. 39a, pp. 10, 111. 



Milne-Edwards separated the genus from Penaeus because 

 the pleopods have only one branch instead of two. He did 

 not take account of the male petasma. Miss Eathbun in 1901 



