Crustacean Fauna of South Africa. 287 



on the record of a specimen caught in 33 23' S. 7 40' E. Whether 

 this be counted within the South African region, it is interesting to 

 record a specimen from a locality quit 3 near the South African coast, 

 and moreover exhibiting features definite enough to characterise a new 

 species. 



CTSTISOMA AFRICANUM n. sp. 



Head 30 mm. in length and about the same in breadth, depth 

 indeterminable. Eyes contiguous, but diverging in the posterior 

 quarter. Lower lateral margins with 18 teeth, on the under surface 

 of head near the mouth-parts 6 teeth, of which the 1st (anterior) 

 is the largest and stands somewhat in advance of the rest. 



Pearaeon segments 1 and 2 apparently coalesced, the dorsal keel 

 not markedly different from that of C. spinosum, but the denticulation 

 on the lateral portions of the posterior margins very inconspicuous. 

 Ventral surface very much as described by Stebbing for C. spinosum 

 (1888, I.e. p. 1328), the " genital papilla," however, not so elongate as 

 figured by him (plate 154). The rudimentary branchiae present and 

 verv similar in shape. 



Both of the 1st antennae are broken, but apparently they would 

 not exceed half the length of the head, there is a slight bend near the 

 base, and the basal portion is stouter, but no suture is visible ; present 

 length 8 mm. 



Epistome and upper lip similar to that of C. spinosum, but upper 

 lip not or scarcely at all asymmetrically cleft. 



Lower lip as in C. spinosum, but lobes more oblong, the apices 

 roundly subtruncate. 



Mandibles very similar to those figured for G. spinosum, but trunk 

 with 3 strong teeth on anterior margin, cutting-edge with 10 teeth, 

 secondary cutting-edge with 15 teeth. 



First maxilla as figured for C. spinosum. 



Second maxilla broad at base, a semicircular projection on inner 

 margin with 4 small spinules, beyond this the inner margin narrows 

 rapidly and runs nearly straight to apex, which bears fine acute teeth 

 and small spinules on inner side. 



Maxilliped, inner plate with long keel on inner surface, ending some 

 distance before apex, the inner concave distal margin with 2 spinules 

 on either side of middle, outer margin similarly armed, the spinules 

 very small, outer plates with 14 teeth on right and 10 on left (excluding 

 the apical one), all the teeth more or less of the same size, except the 

 basal ones which are smaller. 



