234 Annul* of the South African 



2 rfcJ, 1 nonovigerous ?. (S.A.M. No. A2470.) In weed at low- 

 water. 



Very like the northern H. prevostii (M. Edw.),but distinguished by 

 the serrate hind margin of 2nd joint of peraeopods 3-5 and the more 

 numerous spines on hind margin of 6th joint of peraeopods 4 and 5. 

 Chevreux (1900, Et's. Camp. Monaco, vol. 16, pi. 1, fig. 3/) has 

 figured the 5th peraeopod of an Azores specimen of H. prevostii with 

 a serrate hind margin to the 2nd joint and a smooth hind margin to 

 the 6th joint. Delia Valle and Sars figure both joints with smooth 

 hind margins. 



HYALE HIRTIPALMA (Dana). 



1852. Allorchestes hirtipalma Dana, Pr. Amer. Ac. vol. 2, p. 205. 

 1853/55. id. U.S. Expl. Exp. vol. 13, 2, p. 888, pi. 60, 



fig. 4. 



1862. inca Bate, Cat. Amphip. Brit. Mus. p. 40, pi. 6, fig. 7. 



1879. Nicae-a ftmbriata Thomson, Tr. N.Z. Iiist. vol. 11, p. 236, pi. 10u, 



fig. 2. 

 1888. AUorchestes georgianus Pfeffer, Jahrb. Wiss. Anst. Hamb. vol. 5, 



p. 77, pi. 1, figs. Ifl-w, 4. 



1906. Hyale liirtipalma Stebbing, Das Tierreich, 21, p. 564. 

 1909. Chilton, Subautarct. Is. N. Zeal. vol. 2, p. 643. 



1913. id. Mitt. Naturh. Mus. Hamb. vol. 30, p. 55. 



Chilton includes in the synonymy also H. villosa Smith 1876, and 

 H. trigonochir Walker 1908. These form the two extremes ; in the 

 former the 6th joint of the 1st gnathopod does not widen to the palm, 

 in the latter it widens so much that the palm is at least twice the 

 length of the hind margin. 



As Chilton (1909) remarks, this character is indeed variable, but 

 appears to be not so much individual as local. Among the Cape 

 specimens those from Kalk Bay (False Bay) belong to the form 

 vUlosa, whereas those from Buffel's Bay (also in False Bay) and from 

 Capf Town in Table Bay have the 6th joint distinctly though not 

 strongly widened. Amongst the specimens from each locality there 

 can be detected no variation, except that due to age as mentioned by 

 Stebbiug (1906). 



On the other hand, the variation in the brushes of setules on the 

 lower margin of the flagella of the 2nd antennae appears to be more 

 individual. In many cases the flagella are practically destitute of 

 these brushes. 



