AMPELISCIDAE 83 



From Chevreux's figures it is easy to see that the process on pleon segment 3 is larger 

 than in eschrichtii, and the 2nd joint of peraeopod 5 more evenly rounded than in even 

 the Antarctic form of eschrichtii. But the most distinctive feature is the shape of the 

 head, which at once distinguishes bonvieri from all other Antarctic Ampeliscids except 

 Haploops securiger (infra). The 2nd joint of the mandibular palp is linear. 



A. bouvieri is undoubtedly a distinct species. 



Distribution. Palmer Archipelago, 60-70 m. 



Ampelisca hemicryptops, Brnrd. (Fig. 37 b). 

 Barnard, 1930, p. 329, fig. 8. 



Occurrence: 1. St. 170. South Shetlands. 1 ovig. 9 23 mm. 



2. St. 175. South Shetlands. 3 $3 19-22 mm., 2 $$ 22-23 mm., 1 ovig. $ 23 mm., 

 3 juv. 11-13 mm. 



3. St. 181. Palmer Archipelago. 1 3, 2 $$ 14-15 mm. 



4. St. 186. Palmer Archipelago. 1 <J20 mm. 



5. St. 187. Palmer Archipelago. 1 ovig. 9 21 mm. 



6. St. 190. Palmer Archipelago (315 m.). 1 $ 21 mm. 



Remarks. Contrary to the Terra Nova specimens, these have the long subapical spine 

 on the outer ramus of uropod 2. The 6th joint of peraeopod 5 is linear. The examina- 

 tion of further specimens shows that there is not the slightest difficulty in distinguishing 

 this species from eschrichtii at a first glance. The shape of the head and the position of 

 the upper corneal lens are distinctive, as shown in the figure here given, apart from the 

 position of the lower corneal lens. The position of the latter is quite constant. 



Distribution. McMurdo Sound, 256-441 m. 



Ampelisca bransfieldi, n.sp. 



Occurrence: St. 177. South Shetlands. 1 <$ 19 mm., 1 $ 16 mm. 



Description. Like eschrichtii but without any corneal lenses, or (as preserved) ocular 

 pigment. Head slightly compressed dorsally, but not keeled, about intermediate be- 

 tween eschrichtii and hemicryptops in this respect. Second joint of mandibular palp 

 linear. Postero-inferior angle of pleon segment 3 more strongly produced than in 

 eschrichtii; dorsal carina on segment 4 as in the Antarctic form of eschrichtii. 



Antennae 1 and 2 subequal, extending to about 4th or 5th peraeon segment. Dactyli 

 of peraeopods 1 and 2 subequal to 5th and 6th joints together. Peraeopod 5, 2nd joint 

 like that of the northern form of eschrichtii, i.e. with a distinct subangular bend in hind 

 margin, though the greatest breadth is a little lower, opposite the end of 3rd joint, 5th 

 joint without distal notch on anterior margin, 6th joint subequal to 5th, narrow, sub- 

 linear. 



Remarks. The species may be compared with odontoplax Sars, though it differs in 

 the more produced postero-inferior angle of pleon segment 3, and the narrower 6th 

 joint of peraeopod 5. 



