. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. EUPHAUSIA FRIGID A 215 differ from one another, the foremost having striations which are not present in the hindermost. The foremost expansion reaches a httle farther forward ( distally) than the hindermost. Between them, on the outer side of the distal end of the proximal process, there is a conspicuous tooth-like projection easy to see with a low magnification; it is in the position occupied by a very small tooth, which is often difficult to see under a high magnification if the membranous
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. EUPHAUSIA FRIGID A 215 differ from one another, the foremost having striations which are not present in the hindermost. The foremost expansion reaches a httle farther forward ( distally) than the hindermost. Between them, on the outer side of the distal end of the proximal process, there is a conspicuous tooth-like projection easy to see with a low magnification; it is in the position occupied by a very small tooth, which is often difficult to see under a high magnification if the membranous lobes are not so placed as to show it in profile, in E. lucens and E. valletitint. The terminal process is bifid at the extremity. The inner branch may be equal in length to or slightly longer or shorter than the outer; it is divided distally into two unequal lobes, the hinder shorter and smaller than the fore- most. The outer branch is narrower than the inner, triangular or lanceolate in Fig. 15. E. frigida. a, front part of carapace and first segment of antennules from above, x 12. b, left antennular peduncle from the side, x 18. and its hinder margin is finely serrate (Fig. 30 c 2). The lateral process is sharply curved at the end and carries on the curve a strong tooth; in the axil of that tooth on the hinder side there is a small or very small projection. Over 4200 specimens of E. frigida, apart from larval stages, have been measured. The largest males were 21 mm. long, the largest females 24 mm. In September and October some males and females only 11 mm. long, and many slightly larger, were found carrying ripe spermatophores, were sexually mature. The generation born the preceding season become sexually mature at this time before they are physically mature; they grow to full size a month or two later. The larval stages of E. frigida from the second Calyptopis upwards are described later in this paper. Remarks. I am sure that Illig (1930, p. 498) is wrong in
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