South African Crustacea. 71 



1906. Ampelisca brevicornis, Stebbing, Das Tierreich, Amphipoda, 

 p. 100. 



The specimen here in question corresponds in all essentials with 

 that species which Sars describes and figures under the name 

 " Ampelisca Icevigata, Lilljeborg, 1 ' 1855. Costa's name for it, though 

 devoid of descriptive value, has the priority. Among the marked 

 features of this species are the extremely small ocular lenses, the 

 concave lower margin of the head, the strongly bisinuate margins 

 and sharply produced postero-lateral angles of the third pleon 

 segment, the fourth pleon segment with level carina behind the 

 saddle-shaped dorsal depression, and the dorsal rows of setules on 

 the telson. Our specimen, which is a male, considerably exceeds 

 the size given by Sars, being 17 mm. long, whereas Sars says, 

 "length of adult female 12 mm., of male about the same." Its 

 colouring (in spirit) is a uniform pale green. The first antennae are 

 8 mm. long, the second joint of the peduncle the longest, fringed 

 below with numerous tufts of setules, the third joint very short, 

 widening distally, the long slender flagellum more than twice as 

 long as the peduncle, reaching a little beyond the peduncle of the 

 second antennae, and having the first joint peculiarly shaped, at first 

 narrowing rapidly and fringed below with a brush of filaments, and 

 again slightly widening to the apex. The second antennae are 17 mm. 

 long, the penultimate joint of the flagellum much longer than the 

 ultimate, both fringed above with little tufts of setules. 



Locality. Fresh Bay, Koman Rock, N.W. f W. f mile ; depth, 

 18 fathoms ; sand and shells and rough ground. A much smaller 

 specimen, but similar in colouring, was taken at the Station, Table 

 Mountain, E. 41 miles ; depth, 245 fathoms ; bottom, green sand. 



GEN. BYBLIS, Boeck. 



1871. Byblis, Boeck, Porh. Selsk. Christian., 1870, p. 228. 

 1906. Byblis, Stebbing, Das Tierreich, Amphipoda, p. 111. 



The new species differs from the ten species of this genus dis- 

 tinguished in Das Tierreich in that the third uropods reach beyond 

 the first and second pairs by the whole extent of the rami, and in 

 that the telsou, which is considerably longer than broad, is very 

 deeply cleft. The character of the third uropod and that of the 

 telson must, therefore, in each case be modified by insertion of the 

 word usually in the generic definition. It is a matter of convenience, 

 and not of necessity, to use these parts in discriminating Byblis from 



