. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 46 DISCOVERY REPORTS very small papilla. Antennal scale slender, with very long apical spine; flagellum long (broken). In stage i the scale has three stout apical setae and small spine and seta near end on outer side; flagellum unsegmented, twice length of scale. Pleopods long, with rudimentary endopod on 2-5. Uropod very slender, the setose margin twice length of bare part. Mastigopus I (Fig. 37 a, b). Length 3-85 mm. Rostrum o-6 mm. Diff"ers from S. cornicidum A in shape of eye, which is
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 46 DISCOVERY REPORTS very small papilla. Antennal scale slender, with very long apical spine; flagellum long (broken). In stage i the scale has three stout apical setae and small spine and seta near end on outer side; flagellum unsegmented, twice length of scale. Pleopods long, with rudimentary endopod on 2-5. Uropod very slender, the setose margin twice length of bare part. Mastigopus I (Fig. 37 a, b). Length 3-85 mm. Rostrum o-6 mm. Diff"ers from S. cornicidum A in shape of eye, which is relatively shorter and with smaller eyeball. The pleural point of somite 5 is shorter, and the setose part of the uropod more than twice the bare part. Otherwise the two forms are Fig. 37. S. corniciibmi C. a, Mastigopus i; h, telson. Remarks. This Acanthosoma is very much like that of S. corniculum A, but differs in shape of eye and the great length of the dorsal spines of the abdomen. In the form of the eye it resembles the Acanthosoma attributed to S. seyninudus Hansen (Hansen, 1919, p. 20), but that form has much shorter dorsal spines, and is not found in the Atlantic so far as is known. Group II Hansen's group II, with very large maxillipede 3, includes six Atlantic species. Of these S. pectinatus and S. sargassi seem to be so closely related that their larvae may be expected to be very similar. We know nothing certainly about the development of S. sargassi, but we have most of the stages of S. pectinatus, and its larvae differ distinctly in many respects from those of S. vigilax, for example. The larvae, in fact, support a division into two subgroups. If all the Acanthosomas having a short, forked telson of the form known in S. vigilax. 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 work.
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