. Fig. 19. S. crassus. Mastigopus telson. a, 4-2 mm.; b, 4-85 mm.; c, 4-68 mm.; (f, 5-45 mm.; e, 6-95 mm.;/, 14mm.; », 15 mm. large, two-segmented, and setose. The transformation of the telson is shown in Fig. 19. The largest Mastigopus is about 10 mm., and there is an immature phase, according to Hansen, up to about 20 mm., during which the petasma is formed. Colour. Red in thorax, but abdomen colourless. Red patches in antennae and all limbs, and in exopod of uropods. Sergestes robustus Smith Lo Bianco, 1903, p. 182, PI. vii, fig. 9, Acanthosoma 2. Hansen, 1922, pp. 114, 117, Mastigopus and
. Fig. 19. S. crassus. Mastigopus telson. a, 4-2 mm.; b, 4-85 mm.; c, 4-68 mm.; (f, 5-45 mm.; e, 6-95 mm.;/, 14mm.; », 15 mm. large, two-segmented, and setose. The transformation of the telson is shown in Fig. 19. The largest Mastigopus is about 10 mm., and there is an immature phase, according to Hansen, up to about 20 mm., during which the petasma is formed. Colour. Red in thorax, but abdomen colourless. Red patches in antennae and all limbs, and in exopod of uropods. Sergestes robustus Smith Lo Bianco, 1903, p. 182, PI. vii, fig. 9, Acanthosoma 2. Hansen, 1922, pp. 114, 117, Mastigopus and Acanthosoma. Illig, 1927, fig. 62, Acanthosoma (as S. arcticus). Cecchini, 19286, p. 34, Mastigopus. Material. Larvae of this species were taken but rarely at Bermuda, and only over very deep water, at depths of about 250 m. Moults were obtained of first to second Acanthosoma and of Acanthosoma to Mastigopus, but the identity of the Elaphocaris was not proved by moult. 4-2
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