A MONOGRAPH OF THE EXISTING CRtNOIDS 89 



The radials are visible as small paired tubercles in the interradial angles. The 

 i are very short, deeply incised by the axillaries, and strongly carinate. The IBr a 

 (axillaries) are short, broad, over twice as broad as long, and strongly carinatc. The 

 IIBr series resemble the IBr series, but the 2 elements are relatively slightly longer. 



The arms are 13 or 15 in number, 65 mm. long, with about 110 brachials of which 

 the first 8 or 9 are oblong and the following are triangular, not quite so long as broad, 

 becoming elongate distally. The brachials in the distal two-thirds of the arm overlap 

 more or less. The elements of the IBr and IIBr series and the first 9 or 10 brachials are 

 sharply flattened laterally and are in close lateral apposition. The middle and distal 

 brachials are somewhat compressed laterally and have an ill defined median keel. 



PI is 6 mm. long, longer and stouter than the succeeding pinnules though not 

 markedly so, with 12 segments which are about as long as broad and are flattened 

 exteriorly. The following pinnules decrease gradually in length to P s or P 9 which is 3 

 mm. long with 7 short segments, then become gradually longer again, reaching distally 

 a length of 8 mm. with 17 or 18 rather short segments, of which the first is short and 

 broad and the second trapezoidal. 



Locality .Albatross station 4936; Eastern Sea, off Kagoshima Gulf; Sata Misaki 

 Light bearing N. 21 E., 5.7 miles distant (lat. 3054'30" N., long. 13037'30" E.); 

 188 meters; stones; August 16, 1906 [A. H. Clark, 1907, 1908, 1912, 1915, 1918] (2, 

 U.S.N.M., 22634 [type], 35594). 



History. This species was originally described under the name Antedon albqflava 

 from two specimens from Albatross station 4936 in 1907, the specimens having been 

 dredged in the year previous. Later in 1907 it was transferred to the new genus 

 Thalassometra, and it was included as Thalassometra albqflava in a list of the crinoids 

 of Japan published hi 1908. In my memoir on the crinoids of the Indian Ocean 

 published in 1912 this species was listed as Paramctra alboflaoa, and the synonymy 

 and range were given. The significance of the range was discussed in a paper published 

 in 1915. In my report upon the unstalkcd crinoids of the Siboga expedition published 

 in 1918 this species was listed as Lissomctra albqflava and the original reference was 

 cited. 



Genus CROTALOMETRA A. H. Clark 



Antedon (part) BELL, Marine investigations in South Africa, vol. 4, 1905, p. 141, and following authors. 



Thalasxo metro, (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 126. 



Crotalomelra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 80 (name used in the de- 

 scription of C. ruslica); Proc. U. S. Nat. Mus., vol. 36, 1909, p. 403 (diagnosis; genotype C. 

 eupedata); vol. 40, 1911, p. 12 (occurs in deep water in the Atlantic, but never intrudes on the 

 territory of the Polar-Pacific species'), p. 13 (common to southeastern Africa and the Bay of 

 Bengal, but not found in the Arabian Sea); Crinoids of the Indian Ocean, 1912, p. 10 (absent 

 from Japan), p. 24 (range), p. 59 (in key), p. 209 (original reference; type); Internal. Rev. gesamt. 

 Hydrobiol. und Hydrogr., 1914, pp. 4 and following (occurs in both Atlantic and Pacific; range); 

 Die Crinoiden der Antarktis, 1915, p. 164 (range), p. 181 (both Atlantic and Pacific; range in 

 each); Unstalked crinoids of the Sibo^a-Exped., 1918, p. 148 (in key; range; key to the included 

 species); Univ. Iowa Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 13 (West Indies and Indo- 

 Pacific), p. 19 (in key); The Danish Inyolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 40 (range). 

 GISLEN, Vid. Medd. Dansk Naturh Foren. K0benhavn, vol. 83, 1927, p. 6. MORTENSEN, Hand- 

 book of the cchinoderms of the British Isles, 1927, p. 25 (Atlantic species; in key). A. H. CI.*RK, 

 Journ. Linn. Soc. (Zool.), vol. 36, No. 249, April 1929, p. 654. GISLN, Kungl. Fysiograf. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, p. 22; Kucgl. Svcnska Vet.-Akad. Handl., ser. 3, vol. 17, 

 No. 2, Oct. 3, 1938, p. 5. 



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