South African Crustacea. 13 



The rostrum of the specimen is broken, but the sculpture of 

 the carapace and the thelycum agree with Alcock's figure, and 

 the telson has three small lateral spines on one margin and two 

 on the other. The length of the specimen, with allowance for 

 the broken rostrum, may be estimated as 140 mm. 



Locality. Van Staden Eiver, N. by E. \ E. 3 miles (St. 

 Francis Bay, Cape Colony) ; depth 32 fathoms. A 1038. 



PENAEUS CANALICULATUS, Olivier. 



1811. Penaeus canaliculatus, Olivier, Encycl. Methodique, p. 660. 



1888. ,, Bate, Eep. Voy. Challenger, vol. 24, 



p. 243, pi. 32, figs. 1, 2. 



1911. ,, de Man, Siboga Exp., vol. 39a, p. 147. 



1913. ,, de Man, Siboga Exp., vol. 39, pi. 9, 



figs. 34a, 346. 



Bate's account of this species gives " rostrum slightly arched, 

 furnished on the upper surface with nine teeth, the posterior 

 of which stands on the gastric region a little unequally distant 

 from the preceding, and one tooth on the lower margin imme- 

 diately below the most anterior of those on the upper." 

 "With this our specimen agrees, except in having ten teeth 

 instead of nine, as also with Bate's account of the telson, 

 " acuminate and fringed with hairs at the sides ; dorsal 

 median line longitudinally channelled to the apex." It agrees 

 also with de Man's observation that the telson is charac- 

 terized by bearing no spinules on its lateral margins. So far 

 as could be discovered without dissection the thelycum corre- 

 sponds with that which de Man figures for the young female. 

 The only point in which the specimen appears to differ from 

 earlier descriptions regards the extension of the rostrum, 

 which reaches beyond the dark bean-shaped eyes, but not 

 nearly to the apex of the peduncle of the first antennae. This 

 peduncle reaches the level of the lateral tooth of the scale 

 of the second antennae. The scale extends some distance 

 beyond this tooth. The flagella of the first antennae are of no 

 great length ; the upper stouter one is the shorter. The 

 flagellurn of the second antennae measured 70 mm., there- 

 fore being longer than the body, which is only 50 mm. The 

 first peraeopods are short, nor are any of the limbs con- 

 spicuously elongate. The inner branch of the uropods is 

 longer than the telson and shorter than the outer branch, 



