360 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



the proximal half slightly longer and those in the distal half slightly shorter. The 

 synarthrial tubercles are rather prominent, though small, as in specimens of Amphi- 

 metra discoidea from Port Molle, Queensland. P 2 is much larger than the small and 

 weak Pj and is long and stout; P 3 is similar to P 2 and is nearly as long and stout. 

 The following pinnules are small and weak. 



The specimen from Holothuria Bank, which is probably of this species, has 10 

 arms 50 mm. long. The cirri have 22 segments of which the fifth and following bear 

 long dorsal spines and of which the longest are not quite so long as broad. 



Localities. Andai, New Guinea [P. H. Carpenter, 1881, 1883, 1888; Bell, 1882; 

 A. H. Clark, 1908, 1911, 1912, 1918] (1, L.M.). 



Holothuria Bank; 27 meters [A. H. Clark, 1911, 1913, 1918] (1, B.M.). 



History. This species was first described by Dr. P. H. Carpenter hi 1881 from 

 a single specimen in the Leyden Museum. In the year following Prof. F. Jeffrey Bell 

 gave a specific formula for it which was amended by Carpenter in 1883. 



In his key to the species of the Milberii group hi the Challenger report (1888) 

 Carpenter grouped Antedon pinniformis with Antedon serripinna and A. carpenteri 

 under the headings P tt present, P 2 and P b the largest pinnules, and the cirrus segments 

 short. He said that pinniformis has 25 cirrus segments and the first brachials much 

 incised, whereas in serripinna and carpenteri there are barely 20 cirrus segments and 

 the first brachials are not incised. 



This grouping of pinniformis with serripinna and carpenteri, both of which 

 belong to the genus Oligomctra, led me in 1908 to refer pinniformis also to that genus. 



In 1911, after studying Carpenter's type specimen in the Leyden Museum in 

 1910, 1 referred pinniformis to the genus Amphimetra, and in the same year I recorded, 

 as Amphimetra sp., another specimen from Holothuria Bank, which was definitely 

 assigned to Amphimetra pinniformis in 1913. 



AMPHIMETRA TESSELLATA TESSELLATA (J. Miiller) 



PLATE 40, FIGURES 185-187 



Alecto tessellata J. MULLEH, Monatsb. preuss. Akad. Wiss., 1841, p. 184 (description; India); Archiv. 



fur Naturg., 1841, vol. 1, p. 144 (description; India); Abh. preuss. Akad. Wiss., 1841 (1843), p. 



224. A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 282 (synonymy; original description 



quoted; unidentifiable). 

 Comatula (Alecto) milberti J. MULLER, Monatsb. preuss. Akad. Wiss., 1846, p. 178 (description; 



North America; type brought from New York); Abh. preuss. Akad. Wiss., 1847 (1849), p. 255 



(redescribed). A. H. CLARK, Bull. Mus. Hist. Nat., Paris, 1911, p. 245 ( = Amphimetra milberti); 



Crinoids of the Indian Ocean, 1912, p. 30 (same). 

 Comatula jacquinoti J. MULLER, Monatsb. preuss. Akad. Wiss., 1846, p. 178 (description; Ceram); 



Abh. preuss. Akad. Wiss., 1847 (1849), p. 255 (redescribed). DUJARDIN and HUPE, Histoire 



naturelle des zoophytes, fichinodermes, 1862, p. 202 (redescribed). A. H. CLARK, Bull. Mus. 



Hist. Nat., Paris, 1911, p. 244 ( = Amphimetra milberti); Crinoids of the Indian Ocean, 1912, 



p. 30 (same). 

 Comalula tessellala J. MULLER, Abh. preuss. Akad. Wiss., 1847 (1849), p. 251 (redescribed). 



DUJARDIN and HUP, Histoire naturelle des zoophytes, fichinodermes, 1862, p. 202 (synonymy; 



description; mer des Indes). P. H. CARPENTER, Trans. Linn. Soc. (Zool.), ser. 2, vol. 2, 1879, 



p. 29 (unable to place it either in Antedon or Actinometra) . A. H. CLARK, Crinoids of the Indian 



Ocean, 1912, p. 30 (identity doubtful). 

 Alecto milberti LUTKEN, Gronlands fichinodermata, 1857, p. 60. 



