252 Annals of the South African Museum. 
Both dentatus and semidentatus are distinguished from thompsoni 
Walker (Proc. Liverp. Biol. Soc. vol. 12, p. 283, pl. 16, figs. 3-6) by 
having 3 teeth on pleon segment 4, instead of 2 as in the latter species, 
and also by the 2nd gnathopod. 
The 2nd gnathopod of 2? bears some resemblance to that of E. 
thomsoni (Stebb.), but that of the ¢ is rather different so far as can 
be judged from Stebbing’s description (Sci. Res. ‘‘ Thetis,” pt. 12, p.614, 
1910). It is compared with the 2nd gnathopod of Elasmoides chev- 
reuxt Stebb., but such a comparison will not hold good for the present 
"species. 
Gen, CHEVALIA Walker. 
1904. Chevalia Walker in Herdman’s Ceyl. Pearl Fish. Suppl. Rep. 
17,p. 288. 
1906. 4s Stebbing, Das Tierreich, 21, p. 737. 
1912. Ms Pearse, Proc. U.S. Nat. Mus. vol. 438 [1913], p. 374. 
CHEVALIA AVICULAE Walker. 
1904. Chevalia aviculae Walker, lc. p. 288, pls. 7, 8, fig. 50. 
1906, # . Stebbing, l.c. p. 737. 
1909. = zs Walker, Tr. Linn. Soc. Lond. vol. 12, pt. 4, 
p- 341. 
These specimens agree with Walker’s description. The 6th joint 
of the 2nd gnathopod is twice as long as the 5th, the palm is finely 
crenulate and the defining angle is not quite so prominent as in 
Walker’s figure. The uropods and telson are exactly as Walker 
figures them. 
Length: 5 mm. 
Colour: In spirit, whitish, eyes reddish-brown. 
Locality : Cape St. Blaize N. by E., distant 73 miles. 125 fathoms. 
8 specimens, apparently all dg. s.s. “ Pieter Faure.” 21/12/99. 
(S.A.M. No. A8813.) 
Geogr. Distribution : Ceylon ; Seychelles, 22-26 fathoms ( Walker.) 
Famiry AMPITHOIDAE. 
1899. Amphithoidae Stebbing, Ann. Mag. Nat. Hist. ser. 7, vol. 4, 
p. 2. 
1906. Ampithoidae id. Das Tierreich, 21, pp. 631, 738. 
1910. x id. Gen. Cat. S.A. Crust. p. 462. 
