124 Some Natal Crustacea 
Among the very numerous species of Alpheus discussed in the 
elaborate treatises of de Man and. Coutiére I have failed to find any 
notice of Guérin’s species, although I should suppose that it properly 
takes precedence of A. ventrosus, M. Edwards, by the acknowledgment 
which Milne Edwards himself awards to the excellence of Guérin’s 
figure. 
The specimen which I name above is a very small one, with carapace 
8 mm. long and pleon 13 mm. It is a female laden with eggs, 
unfortunately without the smaller chela of the first pair, but with the 
large chela on the left and the second perzopods agreeing well with 
Guérin’s figure. The peduncle of the second antenna just reaches the 
extremity of the scale. The finger, however, in the last three 
perzeopods is apically duplex, a feature not shown in Guérin’s figure, 
that author writing of these limbs that they are without spines, 
perhaps from an oversight due to insufficient magnification. The 
specimen was taken by Mr. Bell Marley at Vetch’s pier. He describes 
the colouring as ‘‘ pale olive yellow, claw white, nippers black,” 
EXPLANATION OF PLates X VITI-XX, 
\llustrating paper by the Rev. T. R. R. Stebbing on 
“ Crustacea of Natal.” 
PLATE XVIII. 
LHippolysmata marleyi, sp. nov. 
n.s. Line indicating natural size of the specimen of which the details 
are here figured. 
car, Carapace partly figured in profile, with the eye. 
ik Telson in dorsal aspect. 
a.s.,a.i. First antenna and part of second. 
m., m., mx. 1., mx. 2. The mandibles, one in part; the first and second 
maxillz. 
prp. 1, 2, 3,4. First and second perzeopods, with chela of second further 
enlarged; finger of third much magnified; fourth with 
finger further magnified in agreement with that of the third, 
urp. Uropod, uniform in scale with the telson, 
