A MONOGRAPH OF THE EXISTING CRINOIDS 177 



larger. The second-fourth segments are strongly carinate, and the fifth is slightly so. 

 P a is 5 mm. long with 11 segments, somewhat broader basally than P c , tapering evenly 

 from the base to a slender and delicate tip, slender and rather flexible. The first 

 segment is about twice as broad as long, the second is slightly broader than long, the 

 third is half again as long as broad, the fourth is twice as long as broad, the fifth is 

 nearly or quite three times as long as broad, and those following are still longer, the 

 distal about six times as long as broad and very slender. The pinnule is slightly, 

 though distinctly, carinate, and the first three segments have slight dorsal processes 

 on the side toward the arm tips. The ends of the segments are very slightly and finely 

 spinous, the spines being longest at the prismatic angles. P 2 is 5 mm. long and re- 

 sembles P a . Syzgyies occur between the elements of the IBr series, and between 

 brachials 3+4, 8+9, 13 + 14, and 17+18, and distally at intervals of 3 muscular 

 articulations. 



Localities. — Investigator station 387; off Cape Negrais, Burma (lat. 15° 25' N., 

 long. 93° 45' E.); 73-89 meters; sand and coral; November 16, 1909 [A. H. Clark, 

 1912] (2, U. S. N. M., 35141; I. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen ; station 54; 85 meters; 

 sand and coral; May 9, 1922 (1, C. M.). 



Suvadiva atoll, Maldive Archipelago; lagoon; 80 meters or less; Willebrord 

 Snellius, May 4, 1929 [A. H. Clark, 1936] (2, L. M.). 



Remarks. — This species is as yet known only from the two specimens dredged by 

 the Royal Indian Marine Surveying steamer Investigator in 1909 and described in 

 1912, another from the Kei Islands collected by Dr. Th. Mortensen and not previously 

 recorded, and two from the Maldive Islands dredged by the Willebrord Snellius in 

 1929. 



EUDIOCRINUS PULCHELLES GisI6n 



Eudiocrinus gracilis var. pulchellus Gisl^n, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5. 

 No. 6, 1922, p. 4 (127-182 m.), p. 69 (Bock's stations 45, 46, 47, 48, 53; description and discus- 

 sion) . 



Eudiocrinus gracilis pidchellus Gisl£n, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 

 1922, p. 6 (Bonin Islands), pp. 8, 73, 182, 183 (listed), figs. 60-63, p. 70, pi. 1, fig. 5— Gisl£n, 

 Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 17. 



Eudiocriuus gracilis pidchellus GislIsn, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 

 1922, p. 182 (listed). 



Diagnostic features. — This species is closely related to E. gracilis and possesses 

 similar long-segmented P a and P 2 ; but these pinnules are scarcely longer than the 

 other proximal pinnules instead of being markedly longer as is the case in E. gracilis. 



Description. — According to Gislen the centrodorsal is flattened, 1.5 mm. in di- 

 ameter, with the free dorsal pole 1 mm. in diameter. 



The cirri are XIX, 13-15, from 5.5 to 6.5 mm. in length. The first two segments 

 are broader than long, the third is as long as broad, and the fourth-sixth are about 

 twice as long as the median width. The following segments become shorter again, 

 the antepenultimate being about as long as broad. 



The radials are smooth. The IBr series is as long as broad. 



The five arms are 40 mm. in length. The brachials do not overlap, even in the 

 distal portion of the arms. The width of the first brachial is 0.8 mm. 



