XII.—Some Crustacea of Natal, 
by the 
Rev. T. R. R. Stebbing, M.A., F.R.S., F.L.S., F.Z.S. 
Witrn Pruates X VIII-XX. 
A COLLECTION of Crustacea made recently by Mr. H. W. Bell 
Marley on the coast of Natal, though consisting chiefly of species 
already known to occur there, is interesting for the careful notes 
which he proposes to publish on the colours of freshly taken specimens. 
These may prove very useful to other collectors for prompt identi- 
fication of their captures, in place of the minute scrutiny often exacted 
by museum students when original hues have faded or completely 
changed. Apart from this, some examples of the Caridea seemed to 
call for fuller discussion, and in one instance even to claim specific 
distinction. At the same time attention is directed to the increasing 
difficulty in naming specimens within the family Alpheide, partly from 
the variability of some features in the species themselves, partly from 
imperfect descriptions in the original institution of the species, but 
partly, on the other hand, one might venture to suggest, from over 
reliance on differences of measurement, such as among mankind would 
justify a bewildering specific diversity. 
Trine CARIDEA. 
Famity HIPPOLYTIDZ. 
For a valuable key to numerous genera of this family, see Kemp, 
Records of the Indian Museum, vol. x, pt. 2, no. 4, p. 82, 1914. 
Genus HIPPOLYSMATA, Stimpson. 
1860. Hippolysmata, Stimpson, Pr. Ac. Sci. Philad., p. 95 (26). 
1914. H., Kemp, Rec. Ind. Mus., vol. x, pt. 2, pp. 83, 112. 
1916. H., Kemp, Rec. Ind. Mus., vol. xii, pt. 8, p. 401. 
In the key, Lysmata has ‘‘Upper antennule flagellum unequally 
biramous.” Hippolysmata has it uniramous, that is, the shorter inner 
ramus is wholly, instead of only partially, coalesced with its companion. 
As Mr. Kemp observes, the distinction is so slight that any distinction 
of genera depending on it may have to be relinquished, 
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