160 DISCOVERY REPORTS 



Hansen figures the telson with the lateral margins convex at about one-third of the distance from the 

 base, but in all Discovery specimens they are almost straight, converging evenly to the rounded apex. 

 They are armed throughout their entire length with 24-27 small regular spines and the apex is armed 

 with one pair of long slender spines, which are set somewhat apart leaving a characteristic gap in the 

 median line (Fig. 39 H). The rostrum, which is not mentioned by Hansen, is pointed and short, 

 extending only to half the length of the first segment of the antennular peduncle (Fig. 39 A). I have 

 figured the maxilla, one mandible with palp, and the first three thoracic endopods, in order to show 

 how closely they resemble Hansen's figures (Fig. 39B-F). 



Fig. 39. Mysidopsis acuta Hansen. A, anterior end of adult male in dorsal view, x 20; B, mandible, x 20; C, maxilla, x 45; 

 D, first thoracic appendage with epipod, X25; E, second thoracic appendage, X20; F, third thoracic appendage, X20; 

 G, fourth pleopod of male, x 20; H, telson and right uropod, x 20. 



Distribution. The types of this species were taken in 16 m. in Berkeley Sound, Falkland Isles 

 and it has since been taken on two occasions off Tierra del Fuego in 6-10 fm. (Hansen, 192 1, p. 3). 

 The present records do not appreciably extend its known geographical range, but most of the captures 

 were made at greater depths. The deepest water in which it was taken by ' Discovery ' was at station 

 123 at a depth of 230-250 m. 



Mysidopsis camelina sp.n. 



Occurrence: ^ &• 4 ) 



St. 90. 10. vii. 26 (day). Simon's Town, False Bay, South Africa, 10-12 m., 1 adult $, 6-2 mm., large empty brood 



sac. 

 St. 406. 5. vi. 30 (day). Simon's Town, False Bay, South Africa, 29 m., 1 ovig. ?, 6-2 mm. Type. 



Description. General form small and robust; sigmoid in lateral view. Carapace small, with two 

 strong protuberances like two humps in the mid-dorsal line, posterior to the cervical sulcus. The two 



