ASTEROIDEA 



Acodontaster elongatus granuliferus (Koehler) 



(Plate I, figs. 1-6) 



Asterodon Grayi, Perrier, 1891, p. 138. 



Odoniaster granuliferus Koehler, 1912, p. 77, pi. 6, figs. 7, 10. 

 Odontaster propinquus A. H. Clark, 1917, p. 7. 

 Acodontaster granuliferus Koehler, 1920, p. 192. 

 Odontaster glaber Barattini, 1938, p. 22. 



Diagnosis. Differing from typical elongatus in having shorter rays, broader disk, 

 fewer marginal plates, the superomarginals sometimes thick, broad, and convex. Form 

 stellate to arcuate stellato-pentagonal. 



In the following list of localities c and g after the number of specimens signifies forma 

 ceramoideus and forma granuliferus. 



St. 652. Burwood Bank, 171-16901., ic. 



St. WS 80. Falkland Islands, 50° 57' S, 63° 37' 30" W, 152-156 m., fine dark sand, zg. 

 St. WS 81. 8 miles N 11° W of North Island, West Falkland Island, 81-S2 m., sand, ig. 

 St. WS 83. 14 miles S 64° W of George Island, East Falkland Island, 137-129 m., fine green sand 

 and shell, zc, 1 intergrade. 



St. WS 84. 7I miles S 9° W of Sea Lion Island, East Falkland Island, 75-74 m., shells and stones, 



St. WS 85. Falkland Islands, 52° 09' S, 58° 18' W, 79 m., sand and shells, zg. 



St. WS 93. West Falkland Island, 51° 51' S, 61° 30' W, 133-130 m., fine dark sand and stones, 



2.9 2 C. 



St. WS 98. 49° 54' 15" S, 60° 35' 30" W, 171 m., zg. 



St. WS 246. Falkland Islands, 52° 25' S, 61° 00' W, 267-208 m., coarse green sand and pebbles, 



IC. 



St. WS 248. Falkland Islands, 52° 40' S, 58° 30' W, 210-242 m., fine green sand, pebbles, zc. 



St. WS 793. 45° 53' S, 61° 35' W, I08-III m., IC. 



St. WS 796B. 47° 53I' S, 63° 32J' W, 108-112 m., i^. 



St. WS 799A. 48° 04i' S, 62° 48' 07" W, 141-137 m., ic. 



St. WS 804. 50° 22f' S, 62° 49' W, 150-143 m., i^. 



St. WS 807. 49° 5or S, 65° 03' W, 125-126 m., IC. 



St. WS 815. 51° 5if' S, 65° 44' W, 132-162 m., i^. 



St. WS 823. 52° 14*' S, 60° 01' W, 80-95 m., i^. 



St. WS 824. 52° 29i-' S, 53° 27I' W, 146-137 m., i^". 



St. WS 825. 50° 50' S, 57° is\' W, 135 m., i^, IC. 



St. WS 871. 53° 16' S, 64° 12' W, 336-841 m., i^. 



Acodontaster elongatus, in a fairly typical form, ranges to South Georgia, but on the 

 Falkland Plateau is represented by a race which occurs in two formae. The extremes of 

 variation might well be considered to represent distinct species if they were not con- 

 nected by numerous intergrading specimens. This variation closely parallels that noted 

 under O. penicillatus, in which occurs the same transition from a stellate form with 

 narrower, more numerous marginals (e.g. Odontaster penicillatus forma penicillatus) to 

 one arcuately pentagonal with short rays and broader, convex, fewer marginal plates 



(e.g. iormdi grayi). 



6-2 



