120 Some Natal Crustacea 
HIPPOLYSMATA MARLEYI, sp. nov. Plate X VIII. 
This species makes an approach to Lysmata chiltoni, Kemp, 1914, 
by the dentation of the carapace and by having a second perzopod in 
which the movable finger is decidedly longer than the fixed one, but 
in our specimen this only applies to one member of the pair. Here, 
as in Vauticaris wnirecedens, Bate, which is identified with Stimpson’s 
Hippolysmata vittatus, the hindmost tooth on the carapace is well 
separated from the tooth next before it. This latter is behind the 
orbit and in common with the three teeth which precede it carries a 
dorsal setule. Such a setule occurs on the level which produces the 
rostrum beyond the eye, in front of which it has two small ventral 
denticles. There is a carinate tooth over the base of the first antenna ; 
the antero-lateral angle is rounded, without denticle. The triangular 
telson, about thrice as long as its breadth at the base, narrows 
gradually to a slightly obtuse apex with a small median spine, the 
distal half laterally fringed with plumose setze ; of the two pairs of 
dorsal spines, the proximal is above the centre. 
In the first antenne the thickened part of the outer flagellum is as 
long as the peduncle, the whole flagellum being more than twice the 
length of the carapace, with the inner flagellum not much shorter. 
The second antenna is considerably longer than the whole body, the 
scale narrowing distally, the small lateral tooth not extending beyond 
the slightly convex apex. 
The mandibles show no sign of a palp and in other respects appear 
to agree with those which I have described and figured for Hxhippolys- 
mata tugele (Ann. S. Afr. Mus., vol. xv, p. 94, pl. 89, 1915), “the 
molar comprising a broad spinuliferous band and by its side a 
projecting dentate plate.” The other mouth-organs are in near 
agreement with those of the species just mentioned, but not showing 
the small conical joint at the apex of the endopod in the first 
maxilliped and having a shorter exopod in the third. 
The first pereeopods have the fifth joint or wrist shorter than the 
palm of the chela, the fingers of which close completely and are 
definitely more than half the palm’s length. The slender second 
pereopods have about twenty divisions to the wrist, the two preceding 
joints not annulate. In the third perzeopods the finger has two spines 
in advance of the apex, while in the fourth and fifth it is rather 
stouter and carries three spines. 
In the first pleopods the short inner ramus is produced into a long 
retinaculum ending in eight minute hooks. The uropods are broad, 
