20 Some Crustacea of Natal 



Though the members of the first pair of chelipeds are similar in 

 structure, that on the right hand of the specimen is much the more 

 massive ; the fingers are closely contiguous and short in comparison 

 with the palm. As usual the delicate chelipeds of the second pair 

 with the seven-jointed wrist are carefully concealed when not in use, 

 at least to judge by the difficulty of bringing them into view for 

 dissection. The short stout fingers of the ambulatory limbs differ 

 from those of S. pax in having no spine behind the unguis. From 

 that species the present differs also much in the stouter flagellum of 

 the first antenna, which is here nearly as long as the peduncle and 

 carries a slender terminal ; the other flagellum is twice as long as the 

 peduncle. It should be noticed, however, that there is a slight 

 difference in length between the two members of the first pair of 

 antenna?. On the telson I find only two pairs of dorsal spines, spaced 

 on the lower half. The truncate apex has a smaller spine at each 

 corner and is fringed with long setae, the series of which is continued 

 up along the sides more than half way. The length of the carapace 

 is nearly 13 mm. the rest of the body measured round the curve to 

 the apex of the telson accounting for another 30 mm. 



Locality. Durban waters. 



Genus HIPPOLYSMATA, Stimpson. 



1860. Hippolysmata, Stimpson, Pr. Ac. Philad., vol. xii, p. 95 (26). 



1914. //., Kemp, Rec. Ind. Mus., vol. x, pt. 2, no. 4, p. 112. 



1916. //., Kemp, Rec. Ind. Mus., vol. xii, pt. 8, no. 7, pp. 385, 401. 



1919. //., Stebbing, Ann. Durban Mus., vol. ii, pt. 3, p. 119, pi. 18. 



In Mr. Kemp's papers useful references will be found to other 

 writers on this genus and its allies. 



Hippolysmata durbanensis, sp. nov. Plate V. 



This little species shares with several others longitudinal stripes of 

 red, the lines being constituted by numerous little dots of colour. The 

 specimens were obtained by Mr. H. W. Bell Marley along with many 

 other species cast up on the beach in Durban Bay. The individual 

 figured is a female, which was loaded with small round white eggs. 

 The species of the genus to which it shows rather close affinity are 

 Spence Bate's Nauticaris unirecedens (which Kemp agrees with 

 de Man in making a synonym of Hippolysmata vittatus, Stimpson), 



