A MONOGRAPH OF THE EXISTING CRINOIDS 465 



of the borders of the ossicles of the division series. The arm bases are broad and 

 stout, almost in contact laterally, and very indistinctly pitted dorsolaterally. There 

 are insignificant synarthrial tubercles. One postradial scries is broken. The others 

 each bear two IIIBr 2 series, externally developed, so that they have six arms arranged 

 in 2, 1, 1, 2 order. Presumably when complete the specimen had 30 arms, which 

 were about 90 mm. long. P : is from 7 to 8.3 mm. long, slender and flexible, with 

 21-23 segments. P 2 is 9 mm. long with 21 segments. P 3 is 8.5 mm. long with 21 

 segments. P 4 is about 6 mm. long with 18 segments. The longest segments of P 2 

 and P 3 are half again as long as broad. These pinnules are coarse and stout, but not 

 stiffened. The disk is naked and incised. The color in alcohol is brownish violet 

 with sparse lighter blotches. 



Regarding this specimen Dr. Gislen said: 



This form with its cirrals bearing dorsal spines and a P, and P 3 being almost as large as P 2 is 

 rather puzzling. One might perhaps think that it should be a young of Liparometra arliculata, 

 but there are no ventrolateral extensions of the basal arm-parts. It might be supposed to be a 

 young of Dichrometra flagellata, but judging from A. H. Clark (1918 Siboga Exp., p. 107), even 

 rather small specimens have P 3 considerably longer than P 2 . 



In 1894 Bell described from the Macclesfield Bank a new species of Antedon, A. moorei. This 

 one was redescribed by A. H. Clark in 1913 and was placed under "unidentified specimens." Never- 

 theless, when discussing Lamprometra prolectus (palmata) in the same paper, he said that there were 

 no valid characters distinguishing A. moorei from a young of L. prolectus. The specimen described 

 above, which fits very well into the descriptions given of Ant. moorei, is however just as large as 

 usual specimens of L. protectus (palmata). As far as I have seen, the species last mentioned is always 

 provided with slender arm-bases and P 2 is early considerably longer than P! and P 3 . Besides, in 

 spite of the fact that there may be a dorsal carination in specimens of L. palmata, there are no dorsal 

 spines on the cirrals. I think that these characteristics will suffice to keep the two species apart. 



Localities. — Port Molle, Queensland; 22-36 meters; H. M. S. Alert [Bell, 1882, 

 1884; P. H. Carpenter, 1883, 1888; Hartlaub, 1891; A. H. Clark, 1907, 1909, 1911, 

 1912, 1913, 1918] (1, B. M.). 



Port Molle, Queensland; 22-36 meters; H. M. S. Alert [Bell, 1884; P. H. Carpen- 

 ter, 1888; Hartlaub, 1891; A. H. Clark, 1911, 1912, 1918] (1, B. M.). 



Moluccas; MM. Quoy and Gaimard, 1829 [J. Muller, 1849; Dujardin and Hupe\ 

 1862; P. H. Carpenter, 1879, 1883, 1888; Bell, 1882; Hartlaub, 1891; A. H. Clark, 

 1907, 1909, 1911, 1912, 1913, 1918] (1, P. M.). 



Siboga station 49a; Sapeh Strait, between Sumbava and Komodo (lat. 8°23'30" 

 S., long. 119°04'36" E.); 69 meters; coral and shells; April 14, 1899 [A. H. Clark, 

 1918] (2, U.S.N.M., E. 387; Amsterdam Mus.). 



Cauda, Nha'trang, Annam; Dr. C. Dawydoff [Gislen, 1936]. 



Geographical range. — From Queensland to the Moluccas, the Lesser-Sunda Islands, 

 and Annam. 



Bathymetrical range. — From the shoreline down to 69 meters. 



History. — This species was first described under the name Comatula (Alecto) 

 articidata by Prof. Johannes Muller in 1849 from a specimen in alcohol in the Paris 

 Museum collected in the Moluccas in 1829 by Jean Rene Constant Quoy and Joseph 

 Paul Gaimard during the expedition of the Astrolabe (formerly the Coquille) under 

 the command of Capt. Jules Sebastien Cesar Dumont-d'Urville. The name ( 'omahtla 

 articulata adopted by Muller was a manuscript name given by Prof. Achille Valen- 

 ciennes that Muller found with the specimen. 



