Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 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
Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 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, 1921, 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 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-d
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