Crustacean Fauna of South Africa. 223 



species Talitrus tfi/Irnticus Haswell and T. kershaivi Sayce, both of 

 which possess a 5th side-plate of the same character as Talitriator. In 

 addition they have the palp of maxilliped 4- jointed, telson longer than 

 broad, a triangularly expanded 5th joint in 1st gnathopod, and the 1st 

 antenna only slightly shorter than the peduncle of 2nd antenna. 



It seems therefore expedient to transfer the two Austi'aliau species 

 to the present genus, which may be defined as follows : 



Like TaUtrus, but with anterior lobe of 5th side-plate much larger 

 than the posterior lobe, 1st antenna only slightly shorter than peduncle 

 <>t' 2nd antenna, palp of maxilliped 4-jointed, 1st gnathopod not so 

 long as 2nd gnathopod and not stronger, 5th joint of 1st gnathopod 

 distally expanded, 2nd joint of 3rd peraeopod moderately or scarcely 

 at all expanded, telson longer than broad. Genotype : T. eaatwoodae 

 Methueu. Includes also T. syl vatic us (Haswell) and T. kershawi 

 (Sayce). 



There is, however, one feature which separates T. eastwoodae from 

 both Talitrus and also the two Australian species and to which Methuen 

 has not drawn attention : namely, the subacute projection on the upper 

 posterior angle of the 2nd side-plate. 



TALITRIATOR EASTWOODAE Methuen. 

 1913. TaUatriator eastwoodae Methuen, I.e. p. 110, pis. 10, 11. 



I have examined 4 specimens from the original locality in the 

 Transvaal, kindly presented to the South African Museum by Hon. 

 P. A. Methuen and labelled by him as " Types." I find that the 

 postero-iuferior angles of pleon segments 2 and 3 are not quite so 

 produced as in Methuen's figm-e (pi. 11, fig. 12), in fact there is no 

 produced point 011 the 2nd at all in two of the specimens. The 2nd 

 antenna reaches to the end of the 3rd peraeon segment. 



There is also in the Museum a considerable number of specimens 

 from the Cape Peninsula and other districts, all of which I consider 

 to be specifically the same as eastwoodae. I have also come to the 

 conclusion that Methuen's specimens were probably not quite mature. 

 Needless to say the specimens show a certain amount of variability, 

 not, however, very great. The size of the adults also varies a little. 



The largest specimens measure 16 mm., and in these the 2nd 

 antenna reaches to the 4th-6th peraeou segment, its flagellum 24-28- 

 jointed, that of 1st antenna 6-8-jointed, 5th and 6th joints of 1st 

 gnathopod more elongate than in the Type specimens, the process of 

 the 6th joint of 2nd gnathopod longer and more pointed and curved 

 upwards, the upper margin being concave. 



