Contributions to the Crustacean Fauna of South Africa. 333 



it resembles T. pliiletaerus in having 4-jointed uropods and non- 

 denticulate ungues on the 5th, Gth, and 7th peraeopods. 



FAMILY GNATHIIDAE. 



GEN. GNATHIA, Leach. 



For references to family and genus see Barnard, Ann. S.A. Mus. 

 vol. 10, pt. 7, p. 200. 



GNATHIA AFRICANA, Brnrd. 

 (Plate XXXVIII. E.) 



1914. Gnathia africana, Barnard, Ann. S.A. Mus. vol. 10, pt. 7, 

 p. 201, pi. XVII. B ($ and larva). 



Since the description of the male and the larva was published, 

 the female has been discovered. 



Female. Anterior margin of head semicircular, entire. 2nd 

 and 3rd peraeon segments short, 4th, 5th and Gth subequal in 

 length, indistinctly separated, anterior margin of 4th, postero- 

 lateral angles of 5th and posterior margin of Gth pigmented 

 and more strongly chitinized. Pleon equal to Gth peraeon 

 segment. Telson narrower than in $ , 2 setae on apex and one 

 on lateral margin, just beyond the middle. 



First antenna as in $ , but 2nd joint of fiagellum as long as 

 3rd joint of peduncle. 



Second antenna as in $ , but 4th joint of peduncle proportionately 

 longer, equal to 2nd and 3rd together. 



Maxilliped. Second joint somewhat produced on inner apical 

 angle, so that inner margin of 1st joint of palp is not free, palp 

 rather shorter and stouter than in $ , outer margin decidedly 

 more curved, due to 2nd joint being twice as broad as long, 

 4th joint more triangular than in , not incurved. 



First peraeopod (guathopod) composed apparently of 3 joints. 

 First joint curved, with prominent spine on outer apical angle, 

 2nd joint half 1st and more slender, outer apical angle with an 

 acute point and 2 setae, 3rd joint nearly as long as 2nd, 2 setae 

 on apex and a row of very fine spinules on outer margin. 

 Marsupial plate oval, about same length as gnathopod. 



Eest of the peraeopods as in $ , but with minor differences ; 

 tubercles only on 4th joint, 5th joint with a strong pectinate spine 

 and a simple seta arising together just beyond the middle of inner 



