. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 33 DISCOVERY REPORTS are greatly reduced. Stage 3 is probably represented in his figures 3 /, g, and we have a very similar stage of g mm. in which the telson has not yet lost the form characteristic of the Acanthosoma. The changes which take place in the telson are shown in Figs. 23,24. Colour as in the Fig. 24. S. robustus. Mastigopus telson. a, stage i; b, stage 2; c, stage 4 ? 11 mm. moulted from form like e\ d, stage 5 ? 12 mm.; e, stage 3, 6 mm.; /, stage 4, 10 mm.; g, h, mou
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 33 DISCOVERY REPORTS are greatly reduced. Stage 3 is probably represented in his figures 3 /, g, and we have a very similar stage of g mm. in which the telson has not yet lost the form characteristic of the Acanthosoma. The changes which take place in the telson are shown in Figs. 23,24. Colour as in the Fig. 24. S. robustus. Mastigopus telson. a, stage i; b, stage 2; c, stage 4 ? 11 mm. moulted from form like e\ d, stage 5 ? 12 mm.; e, stage 3, 6 mm.; /, stage 4, 10 mm.; g, h, moult and post-moult, 18 mm.; i, moult to stage 4 (/). Sergestes prehensilis Bate Syn. S. gloriosus Stebbing (Gordon, 1935, J. Linn. Soc. xxxix, p. 314.) lilig, 1927, fig. 125, Acanthosoma 2. Material. Discovery Station 282 (i°ii'S,5°38'E). One specimen of Acanthosoma 2. Description. Acanthosoma 2 (Fig. 25 a-c). Length 3-61 mm. Rostrum 1-42 mm. Carapace a little longer than wide. Supraorbital spine shorter than eye; four pairs of marginal spines, of which the third is the longest; dorsal spine present. Dorsal organ small. Abdomen with dorsal spines on all somites, those of somites i and 2 not markedly smaller than the rest. Lateral spines very long, that of somite 5 as long as somite 6. Telson more than 2^ times as long as wide, with arms of distal fork slender, slightly divergent, with three inner and two outer spines. Lateral spines of telson far in front of fork. Eye less than one-sixth length of body; eyeball nearly round, its diameter about one- third length of eye. Papilla present on stalk. Antennal scale slender, with long apical spine; flagellum twice as long as scale. Mandible with very small rudiment of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute of Oceanographic Sciences (Great
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