. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. LARVAE OF SERGESTES 3S than in 5. robustus, but those of somite 5 nearly as long as somite 6. Telson about i| times as long as wide, the lateral spines well in front of fork. Arms of fork slender, parallel, with two outer and two inner spines, the two outer spines widely separated. Eye about one-sixth length of body; length of eye i^ times width of eyeball; papilla present. Exopod about nine times as long as wide; setose part of margin slightly longer than bare part. Stage 2. Length 3-95 mm. Ros
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. LARVAE OF SERGESTES 3S than in 5. robustus, but those of somite 5 nearly as long as somite 6. Telson about i| times as long as wide, the lateral spines well in front of fork. Arms of fork slender, parallel, with two outer and two inner spines, the two outer spines widely separated. Eye about one-sixth length of body; length of eye i^ times width of eyeball; papilla present. Exopod about nine times as long as wide; setose part of margin slightly longer than bare part. Stage 2. Length 3-95 mm. Rostrum 1-5 mm. As stage i, but scale with distal spine. Pleopods rather small, without endopods. Uropod a little broader, and setose part equal to bare part. Lateral spine of telson placed farther forward. 1\. a Fig. 27. S. robustus A. Mastigopus telson. a, 7-2 mm.; b, 5-7 mm.; c, 8 mm.; d, 9 mm.; e, the same, branch enlarged to show inner spines;/, 11-6 mm.; ^, 15 mm. We have no Mastigopus corresponding to the Acanthosoma of form B, but several which apparently belong to form A. Measurements of these have been made to compare with specimens from Bermuda which are presumed to be typical S. robustus but these do not reveal any differences which can be regarded as of specific value. The telson, however (Fig. 27), has the same differences as are seen in the Acanthosoma. It appears that form A is a species definitely recognizable as distinct in early larval stages but becoming indistinguishable from S. robustus in advanced Mastigopus stages. S. robustus Form C Material. One specimen of the Acanthosoma was taken in 1935 at Bermuda. The Elaphocaris stages described here were taken at Bermuda in 1939 and their reference to this robustus form is quite speculative. Stage i was connected with stage 2 by moult. An Elaphocaris of the same form has already been described (Gurney, 1924, figs. 26, 28) from New Zealand. 5-2. Please note that these images are extracted from scanned page images th
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