Soutlt African Crustacea. 87 



The incisor process of the mandible has seven well-pronounced 

 but unequal teeth. The palp of the first maxilla is bilobed, with a 

 single spine on the apex of the shorter inner lobe. The last joint of 

 the third maxillipeds has some strong spines on the obliquely truncate 

 apex, one surface thickly set with rows of spines, the preceding 

 joint very short. 



The asymmetry of the first pair of peraeopods is characteristic 

 of the genus, but in this species, besides the usual diversity of form, 

 the inequality of size in the hands, alluded to by the specific name, 

 seems to be carried to an extreme. "While the smaller chela is 

 3-5 mm. long by 1'3 mm. broad, the larger is 8'5 mm. long by 

 3-5 mm. broad, with a corresponding difference in thickness. Not- 

 withstanding this great difference in the bulk of the hands the three 

 preceding joints differ but little in size in the pair. In the second 

 peraeopods the first jointlet of the carpus is rather shorter than the 

 four following combined, the second, third, and fourth each little 

 longer than broad, combined rather longer than the fifth, which 

 equals the palm of the chela and is slightly shorter than the fingers ; 

 the fixed finger has several tufts of stiff setae. The fingers of the 

 fourth and fifth peraeopods are strongly curved at the pointed apex, 

 within which is a short tooth. The sixth joint of the fourth pair has 

 6 spines along the inner margin, which in the fifth pair carries 

 numerous tufts of spinules. The rami of the pleopods are broad, 

 and much more so those of the uropods, the outer of which is 

 prolonged considerably beyond the tooth of its outer margin ; 

 between this and a longer inner tooth are planted two conspicuous 

 spines ; from the inner tooth starts the very sinuous diaeresis. 

 Besides the extensive marginal fringes of plumose setae, the inner 

 ramus down the centre of its ventral surface has numerous rows 

 of spines. The ova are large, 2 mm. long, showing the eyes, but 

 have become hardened. The total length of the mother was 18 mm., 

 the carapace 7 mm. long, and the telson 2'5 mm. 



Locality. Gordon's Bay, False Bay, whence it was obtained 

 by Dr. Gilchrist more than ten years ago. A 1555. 



GEN. ATHANAS, Leach. 



1814. Athanas, Leach, Edinb. Encycl., vol. 7, p. 432. 



1817. ,, Leach, Malac. Podophth. Britanniae, text to pi. 44, 



No. 14. 



1863. ,, Heller, Crust, siidlichen Europa, p. 280. 

 1898. ,, Borradaile, Pr. Zool. Soc. London, p. 1011. 



