. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 186 DISCOVERY REPORTS shoulders with them. In one specimen, from St. 190, the radials, costals and lower brachials are raised into a keel-like ridge in the mid-line. The ossicles of the division series and the brachials of the proximal part of the arm are narrower and less massive than those of /. vivipara (Fig. 17 b). The side edges of the axillaries and lower brachials are sharp and straight. The brachials are of the same shape, the positions of the first two syzygies are the same and other sy
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 186 DISCOVERY REPORTS shoulders with them. In one specimen, from St. 190, the radials, costals and lower brachials are raised into a keel-like ridge in the mid-line. The ossicles of the division series and the brachials of the proximal part of the arm are narrower and less massive than those of /. vivipara (Fig. 17 b). The side edges of the axillaries and lower brachials are sharp and straight. The brachials are of the same shape, the positions of the first two syzygies are the same and other syzygies are as numerous, as in /. vivipara. The distal edges of the outer brachials are raised into moderately strong and conspicuous Fig. 17. hornetra graminea. a, cirrus, x 13. b, proximal part of a ray, x 13. c, disk, in which the anal cone is broken and two of the ambulacral grooves imperfectly seen, x 11. d, z side- and a cover-plate of a distal pinnule, x 66. The oral pinnules differ from those of /. vivipara and /. fiavescens, for P, is as stout and as long as, or longer than, Pj, and P3 is longer than P2. Pi and P, are of 8-10 segments and 3-6 mm. long, depending on the size of the animal; P3 is of 9-12 segments, 3-5-7mm. long. The first three or four segments of Pi are attached by a web of tissue to the disk, and the lower segments of Pa and P3 are similarly attached to the arm. The first genital pinnule is P4 or P5, of about 10-12 segments; the last is P13 to P,6, of about 15 seg- ments and 7-9 mm. 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 Britain); National Institute of Oceanography of Great Britain; Great Britain. Colonial Office. Discovery Committee. London ; New York : Cambridge University Press
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
