50 Some Crustacea of Natal 
Genus HYASTENUS, White. 
1847. Hyastenus, White, Proc. Zool. Soc., p. 56. 
1895. #H., Alcock, Journ. Asiat. Soc. Bengal, vol. lxiv, p. 206. 
Many later references might be given, but they are not appropriate 
to the present occasion. 
HYASTENUS FASCICULARIS (Krauss). 
1843. Pisa fascicularis, Krauss, Siidafrik. Crust., p, 50, pl. 3, figs. 
5, a-d. 
1910. P.f, Stebbing, Ann. 8. Afr. Mus., vol. vi, p. 288. 
The typical Blastus (or Pisa) tetraodon (Pennant) belongs to that 
division of the family in which the rostral horns do not diverge from 
the base, as they do in the present South African species. It seems 
proper, therefore, to transfer it to MHyastenus. The male pleon, 
however, with its widened penultimate segment agrees with that of 
Blastus tetraodon. The Durban specimen, obtained by Mr. T. H. 
Dale, is about 8 mm. long and slightly over 6 mm. broad. It agrees 
well with the figures and description given by Krauss. The palp of 
the first maxilla has a very wide base with a narrow terminal. The 
third joint of the third maxillipeds has the inner margin fringed with 
about a dozen very conspicuous teeth; the exopod is rather broad, 
except distally. 
TrisE CYCLOMETOPA. 
Famity PORTUNIDA. 
Genus CHARYBDIS, de Haan. 
See Ann. 8. Afr. Mus., vol. vi, p. 306, 1910. 
CHARYBDIS ORIENTALIS, Dana. 
1852. Charybdis orientalis, Dana, U.S. Expl. Exp., vol. xiii, p. 285, 
1855, pl. 17, fig. 10. 
1899. C.(Goniosoma) o., Alcock, J. Asiat. Soc. Bengal, vol. lxviii, 
pp. 50, 63 (with synonymy). 
1906. C. 0., Rathbun, U.S. Fish. Comm. for 1903, pt. 3, p. 872, pl, 
13, fig. 1, and text-fig. 32, 
