ASTEROIDEA 201 



Genus Diplopteraster Verrill 



Diplopteraster verrucosus (Sladen) 



Retaster verrucosus Sladen, J. Linn. Soc. Loud. (ZooL), xvi, 1882, p. 196. — 1889, p. 478, pi. 76, figs. 



1,2; pi. 77, figs. 9, 10. — Koehler, 1908, p. 550. 

 Pteraster Ingouffi Perrier, 1891, p. 144, pi. 12, figs. 4a, 46. — Bernasconi, 1937, p. 176. 

 Pferaster ingolji (error typ.) Fisher, 191 1, p. 370 (key). — 1919, p. 458. 

 Diplopteraster verrucosus Fisher, 1911, p. 370. — Koehler, 1923, p. 76, pi. 11, fig. 5; pi. 12, fig. i. — 



Bernasconi, 1939, p. 183, pi. 7, fig. 2; pi. 8, fig. 2. 

 Diplopteraster NordenskjiJhU Koehler, 1923, p. 77, pi. 10, figs. 4-8. — Bernasconi, 1937, p. 184, pi. 7, 

 fig. i; pi. 8, fig. I. 



The Roman numerals V-VIII indicate number of rays; e.g. 29 V, i VI = 29 five-rayed and i six- 

 rayed. 



St. WS 81. 8 miles north-west of North Island, West Falkland Island, 81-82 m., sand, specimens 

 29 V, I VI. 



St. WS 84. 7i miles south-west of Sea Lion Island, East Falkland Island, 75-74 m., coarse sand, 

 shells, stones, specimens 5 V. 



St. WS 85. Falkland Islands, 52° 09' S, 58° 14' W, 79 m., sand and shells, specimens 6 V. 



St. WS 90. 13 miles north-east of Cape Virgins Light, Argentina, 82-81 m., fine dark sand, 

 specimens i VI. 



St. WS91. Tierra del Fuego, 52° 53' 45" S, 64° 37' 30" W, 191-205 m., fine dark sand, shell, 

 specimens 2 VI. 



St. WS 92. Between Falkland Island and Straits of Magellan entrance, 51° 58' 30" S, 65° 01' W, 

 143-145 m., specimens 5 VI. 



St. WS 93. South-west of Beaver Island, West Falkland Island, 135-130 m., specimens i V, i VI. 



St. WS 109. Falkland Islands, 50° 18' 48" S, 58° 28' 30" W, 145 m., fine dark sand, specimens i V. 



St. WS 210. Falkland Islands, 50° 17' S, 60° 06' W, 161 m., green sand, specimens 2 V. 



St. WS 243. North-east of Falkland Islands, 51° 06' S, 64° 30' W, 144-141 m., coarse dark sand, 

 specimens 6 VI, i VII, i VIII. 



St. 776. Off Cape Tres Puntas, Argentina, 107-99 n^-' specimen i V. 



St. 781. Falkland Plateau, 50° 31' S, 58° 50' W, 148 m., specimen i V. 



St. 782A. Falkland Plateau, 50° 29^-' S, 58° 23I' W, 141-146 m., specimen 2 V. 



St. WS 784. 49° 47' S, 61° 05' W, 170 m., dark green sand, specimen i V. 



St. WS 813. 51° 35J' S, 67° 16I' W, 106-92 m., specimen 2 VI. 



St. WS 816. 52° 09!' S, 64° 56' W, 150-160 m., specimen i VI. 



The largest 5 -rayed specimen (St. WS 782) measures: R 76 mm., r5imm. The 

 abactinal aspect agrees with Sladen's figure. The actinolateral membrane is somewhat 

 broader. The apparent width of the actinolateral membrane is modified by the posture 

 of the adambulacral combs, and to a slight degree by retraction during preservation. In 

 this large specimen there are usually 5 spines in both sorts of adambulacral combs ; but 

 in the less prominent comb i or 2 spines next to furrow are small. The number of spines 

 per comb starting with the first plate run as follows, an asterisk marking the alternate, 

 smaller plate: 5, 5*, 5, 5*, 5, 5*, 5, 4*, 5, 4*, 4, 5*, 6, 5*, 5, 5*, 5, etc. There are usually 

 5 marginal spines to each oral plate or 10 to a mouth angle, completely webbed. This 

 number is not invariable, for one plate may have 4 spines, the other 5 ; or, as in the largest 

 example, 5 and 6. The suboral spine, relatively slender and completely sheathed in 



