A MONOGRAPH OF THE EXISTING CRINOIDS 61 



of the division series and consequent apparent narrowness of the lower part of the 

 animal, and in the shortness of the cirri. 



Locality. Sahul Bank, south of the southern end of Timor (lat. 1130' S., long. 

 125 E.); from a cable [Bell, 1893 ("Sahul Bank, North Australia"), 1906; A. H. Clark, 

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



History. This species was originally described under the name of Antedon wood- 

 masoni by Prof. F. Jeffrey Bell in 1893 from two or more specimens that had been found 

 attached to a cable crossing the Sahul Bank (see under Asterometra mirifica, Part 4b, 

 p. 434). Professor Bell did not give the number of specimens, but said that the 

 species was represented in the British Museum and in the Indian Museum at Cal- 

 cutta. In a guide to a portion of the invertebrate exhibits published in 1906 Professor 

 Bell mentioned this species, so the British Museum must possess at least two. 



In 1907 I placed wood-masoni in the new genus Thalassometra , and in 1909 trans- 

 ferred it to the new genus Cosmiometra. In 1910 I examined the single specimen (the 

 type) in the study collection of the British Museum, but overlooked the specimen or 

 specimens in the exhibition hall. In 1911 I compared this species with the new species 

 Cosmiometra philippinensis, and in another paper published in the same year with the 

 new species C. gardineri. In my memoir on the Recent crinoids of Australia published 

 in 1911 Cosmiometra woodmasoni was included and the synonymy was given. In my 

 memoir on the crinoids of the Indian Ocean published in 1912 I published notes on the 

 type specimen in the British Museum, and compared it with the Hawaiian C. crassicirra. 

 I did not find any specimen of this species in the Indian Museum collection. My notes 

 on the type specimen were republished in a paper on the crinoids of the British Museum 

 in 1913. In my memoir on the unstalked crinoids of the Siboga expedition published 

 in 1918 woodmasoni was included in a key to the species of Cosmiometra, together with 

 its range, and the synonymy was given. 



COSMIOMETRA IOLE. ef. DOT. 



PLATE 4, FIGURE 14 



Diagnostic features. A species with 20 arms in which the elements of the division 

 series and first two brachials are entirely smooth dorsally with a narrow and moderately 

 high median carination and the lateral edges produced and slightly everted, broadly 

 scalloped or bearing two or three blunt tubercles; the cirri, which are irregularly ar- 

 ranged on a large columnar centrodorsal are short and moderately stout with 29-35 

 segments. The arms are 100 mm. long, and the cirri are 25 mm. in length. 



Description. The centrodorsal is large, columnar with converging sides, the broad 

 dorsal pole 3 mm. in diameter and thickly beset with papillae which tend to be arranged 

 in radiating interradial lines. The cirrus sockets are very closely crowded and are 

 irregularly arranged. Interradially the rim of the centrodorsal is raised into a high 

 crest which reaches the everted lateral borders of the radials. 



The cirri are XVII, 29-35, 25 mm. in length, and moderately stout. The first seg- 

 ment is very short, and those following slowly increase in length to the fifth, which is 

 somewhat more than twice as broad as long. The sixth is about twice as long as broad 

 and is a transition segment with the proximal three-quarters dull and the distal qunrtrr 

 whitish and highly polished. This segment is constricted, the maximum depth of the 

 constriction being just before the polished distal portion. The seventh segment is 



