. Bulletin of the British Museum (Natural History). 144 THE "ROSAURA" EXPEDITION arises from near the upper edge of each plate forming a regular border to the arm. There is a paxilla-like group of spinules with one or two bi-valved pedicellariae above each spine, at least at the base of the arm. The outer parts of the arms are rather badly damaged. When freshly preserved one of the specimens was straw coloured, with a brown patch in the centre of the disc continuous with broad brown bars running a short distance down the middle of each arm ; there were also brown bands across the out
. Bulletin of the British Museum (Natural History). 144 THE "ROSAURA" EXPEDITION arises from near the upper edge of each plate forming a regular border to the arm. There is a paxilla-like group of spinules with one or two bi-valved pedicellariae above each spine, at least at the base of the arm. The outer parts of the arms are rather badly damaged. When freshly preserved one of the specimens was straw coloured, with a brown patch in the centre of the disc continuous with broad brown bars running a short distance down the middle of each arm ; there were also brown bands across the outer parts of the arms at intervals. The other two specimens were brown, but with deeper colour in areas corresponding to the brown parts of the first specimen. (After 15 years all colour has been lost.). Fig. 2. Dorsal view of the top of two infero-marginal plates (seen in profile because of distortion in preservation causing an abrupt bend just above these plates) and the adjacent paxillae. Remarks. This species is obviously most closely related to Luidia scotti Bell (1917 : 8), which is described fully in the third note on Asteroids in the British Museum by A. M. Clark (1953 : 383). The types of L. scotti were taken off Rio de Janiero in 40 fathoms (73 metres). They differ from L. rosaurae chiefly in having much thicker, more stumpy spines and spinules on the ventral plates, a second enlarged marginal spine above the ambital one on the infero-marginals, and in having fewer ventro-lateral and infero-marginal pedicellariae and no dorsal ones. This last character—the abundance of pedicellariae—is probably not of sufficient value to be used alone for specific distinction but the three points taken together are enough, on the evidence of the material available, to distinguish the two forms as separate species. The second point is interesting since in the types of Luidia doello-jiiradoi Bemas- coni (a synonym of L. scotti in the opinion of ) from off Buenos Aires (Bemas- c
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