. Fig. 26. 5'. robustus A. a, Acanthosoma 2; b, S. robustus B. Acanthosoma i. Stage 2 (Fig. 26 a). Length 5-9 mm. Rostrum 175 mm. Pleopods with small rudiment of endopod on 2-5. Setose part of uropod about equal to bare part. Mastigopus. The Mastigopus is scarcely distinguishable from S. robushis. The telson is shown in Fig. 27. S. robustus Form B Discovery Stations 708, 711. Acanthosoma i (Fig. 26 b). Length 3-2 mm. Rostrum 1-2 mm. Basal spine of rostrum minute. Carapace a little longer than wide (3-6: 3-0) with two pairs of lateral spines, of which the posterior one is a mere point. Supraorb
. Fig. 26. 5'. robustus A. a, Acanthosoma 2; b, S. robustus B. Acanthosoma i. Stage 2 (Fig. 26 a). Length 5-9 mm. Rostrum 175 mm. Pleopods with small rudiment of endopod on 2-5. Setose part of uropod about equal to bare part. Mastigopus. The Mastigopus is scarcely distinguishable from S. robushis. The telson is shown in Fig. 27. S. robustus Form B Discovery Stations 708, 711. Acanthosoma i (Fig. 26 b). Length 3-2 mm. Rostrum 1-2 mm. Basal spine of rostrum minute. Carapace a little longer than wide (3-6: 3-0) with two pairs of lateral spines, of which the posterior one is a mere point. Supraorbital and posterior dorsal spines very short. Lateral spines of somites 1-3 very much shorter
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