. Fig. 22. S. robustus. Acanthosoma 2. a, dorsal; b, ventral. Larvae in the Acanthosoma stage belonging to the Elaphocaris described above, from the north Atlantic, differ from Bermudan specimens in having the setose margin of the uropod about i \ times as long as the bare part in stage i. In other respects the agreement is exact. A single specimen of Acanthosoma in stage i from Discovery Station 703 (7° 17' N, 28° 02' W) has the same form of uropod, but differs in its small size (2-85 mm. without rostrum) and in having a longer eye, with the eyeball larger in proportion. Mastigopus I (Figs. 2
. Fig. 22. S. robustus. Acanthosoma 2. a, dorsal; b, ventral. Larvae in the Acanthosoma stage belonging to the Elaphocaris described above, from the north Atlantic, differ from Bermudan specimens in having the setose margin of the uropod about i \ times as long as the bare part in stage i. In other respects the agreement is exact. A single specimen of Acanthosoma in stage i from Discovery Station 703 (7° 17' N, 28° 02' W) has the same form of uropod, but differs in its small size (2-85 mm. without rostrum) and in having a longer eye, with the eyeball larger in proportion. Mastigopus I (Figs. 23 and 24). Length 4-2 mm. Rostrum 072 mm. Rostrum reaching to end of segment 2 of antennule; basal spine reduced to a small hair. Length of carapace more than twice the width. Supraorbital spine in the single
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