﻿South African Crustacea. 51 



figured on the following, Plate 35a. Bate in 1888 added 

 S. discissipes, S. orientalis, and S. himaxillaris, in the first 

 and third directing attention by the specific names to the most 

 notable characters of the family. The grounds assigned 

 for separating S. orientalis from S. discissipes can scarcely be 

 accepted as adequate. In 1902 de Man describes a very young 

 specimen, related to S. himaxillaris, under the provisional 

 name of S. aviarynthis. There are thus six nominal species 

 in the genus, if we include S. rectirostris, which has been 

 overlooked since its institution. The figures very clearly 

 differentiate it from S. serratus. The rostrum shows 37 teeth 

 above and 7 below in addition to a tooth close to the base ; 

 the first peraeopod has the wrist or fifth joint longer than that 

 of the second peraeopod, and the telson is only about twice as 

 long as broad, with a blunt apex. In S. serratus the rostrum 

 shows 36 teeth above, 27 below, without tooth close to the 

 base ; the second peraeopods decidedly longer than the first, 

 the wrist and fingers contributing to this superiority in a 

 marked degree ; the telson more than thrice as long as broad, 

 with apex acute. 



Stylodactylus serratus, a. Milne-Edwards. 



Plate LXXVI. 



1881. Stylodactylus serratus, A. Milne-Edwards, Ann. Sci. Nat., 



Ser. 6, vol. 11, art. 4, p. 11. 

 1883. „ „ A. Milne-Edwards, Eecueil figs. Crust. 



Nouv., pi. 35a. 

 1888- " „ Bate, Eep. Voy. Challenger, vol. 24, 



p. 853. 

 The South African specimens appear essentially to agree 

 with the descriptions and figures given by A. Milne-Edwards, 

 except that the wrist of the second peraeopods does not differ 

 in length from that of the first pair, although the fingers are 

 much longer. These fingers are quite straight, strongly setose, 

 the apex not acute. In the preserved condition they are 

 resihent, upon separation springing back into position, one 

 overlapping the other so as to look like a single joint. On 

 these limbs and some other parts the long setae, instead 

 of being finely and continuously plumose, have spicules 

 discontinuously projecting at various angles on different 

 lines. 



