148 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



described E. ornatus, which had been dredged by the Koyal Indian Marine Surveying 

 steamer Investigator at station 61 north of the Andamans. In 1911 I recorded E. 

 indivisus from Albatross station 5356 in the Philippines. 



In 1912, Eudiocrinus junceus, E. pinnatus, and E. venustulus were described from 

 the collections of the Dutch steamer Siboga in the East Indies, and in a monograph on 

 the crinoids of the Indian Ocean E. ornatus was redescribed and figured, a new species, 

 E. minor, was also described and figured, and another new species, E. gracilis, was 

 described. In the same year I described also a second specimen of the Japanese E. 

 variegatus, which I had studied at the Hamburg Museum, and in 1913 I published 

 notes upon the type specimen of Bell's E. granulatus, which I had examined in the 

 British Museum in 1910. 



In a report upon the crinoids collected by the Siboga published in 1918, Eudio- 

 crinus junceus, E. pinnatus, and E. venustulus were redescribed and figured, and E. 

 ornatus, E. sernpinna, and E. indivisus were recorded from various Siboga stations. 



In 1922 Dr. Torsten Gisl6n recorded E. indivisus from the Bonin Islands, and 

 from the same region described E. gracdis var. pulchellus and E. loveni, the specimens 

 having been secured by Dr. Sixten Bock during his expedition to Japan in 1914. 



In 1924 Dr. Gislen published extensive notes on the structure of the genus based 

 upon the material from the Bonin Islands. 



KEY TO THE SPECIES IN THE GENUS EUDIOCRINUS 



a 1 . Cirri composed of much elongated segments of which the longest are 3% to 4 tunes as long as 



median width or longer, and the distal are twice as long as broad. 



6'. Cirri greatly elongated with 22 elongated segments, tapering from base to tip, 23 mm. long; 

 enlarged proximal pinnules stout basally, very long, tapering gradually to a delicate, almost 



flagellate, tip; arms 90 mm. long (Moluccas; 95 meters) junceus (p. 149) 



6 2 . Cirri less elongated with 13-15 segments, not tapering distally, 10 mm. long; enlarged proximal 

 pinnules not especially long, tapering evenly to tip; arms 40 mm. long (Mergui Archipelago; 



110 meters) philenor (p. 151) 



a 2 . Cirri shorter, with the longest segments never more than 1% times as long as broad. 



b 1 . Cirri of moderate length, not especially stout, with the earlier segments markedly longer than 



broad, about twice as long as median width or longer. 



c 1 . First segment of PC with a very large spatulate or fan-shaped process as high as width of seg- 

 ment, and following segments with high carinate processes, which rapidly diminish in 

 height distally; ossicles of IBr series and earlier brachials with edges swollen and everted 

 and more or less scalloped or beaded ; a slender and delicate species (Philippines to Kei and 



Lesser Sunda Islands; 73-112 meters) venustulus (p. 160) 



c 2 . Slight and uniform, if any, processes on basal segments of proximal pinnules; not markedly 



slender and delicate. 



d l . Cirri very slender, strongly recurved, and composed of 11 or 12 segments of which the 

 longest are about 2} times as long as median width, and antepenultimate is half again 



as long as broad (Philippines; about 46 meters) eoa (p. 162) 



(P. Cirri not especially slender with shorter segments of which distal are not, or at least are 



not appreciably, longer than broad. 

 e 1 . Ossicles of IBr series and earlier brachials with everted and more or less produced edges, 



dorsal profile of earlier portion of arms being strongly serrate. 



/>. Proximal pinnules very sharply triangular in section; on P 2 and P. distal edges of 



segments are very strongly produced at prismatic angles dorsally so that pinnules 



have a strongly serrate dorsal profile (Philippines to Kei and Lesser Sunda Islands; 



40-100 meters) serripinna (p. 169) 



