A MONOGRAPH OF THE EXISTING CRINOIDS 



169 



In the Challenger collection Dr. P. H. Carpenter found three species of 5-armed 

 comatulids that he considered congeneric with Semper's Ophiocrinus indivisus. In 

 a paper published in 1882, first pointing out that Ophiocrinus Semper, 1868, is pre- 

 occupied by Ophiocrinus Salter, 1853, and suggesting Eudiocrinus as a substitute, 

 he redescribed the only known specimen of Ophiocrinus (Eudiocrinus) indivisus, 

 which was now in the collection of Dr. W. B. Carpenter, his father, and also described 

 the three new species from the Challenger collection. These last, which he called 

 Eudiocrinus varians, E. semperi, and E. japonicus, are now referred to the genus 

 Pentametrocrinus. 



Carpenter in the Challenger reports published in 1884 and 1888 mentioned 

 various features connected with this species but without bringing out any new in- 

 formation. 



In 1894 Prof. F. Jeffrey Bell described and figured in detail a supposedly new 

 species from the Macclesfield Bank, which he called Eudiocrinus granulatus. At 

 that time the type specimen of Semper's indivisus was in the collection of W. Percy 

 Sladen, and Professor Bell was able to compare it directly with his single specimen of 

 granulatus. 



In 1900 Prof. Georg Pfeffer recorded E. indivisus without comment from 

 Ternate. 



In 1911 I recorded and gave notes upon five specimens dredged by the Albatross 

 at station 5356 in the Philippines, and in 1913 I published notes upon Bell's type 

 specimen of E. granulatus, which I had examined in the British Museum in 1910. 

 In 1918 I recorded and gave notes upon 11 specimens dredged by the Siboga at five 

 stations in the Kei and Lesser Sunda Islands. 



Dr. Torsten Gisle"n in 1922 recorded and gave notes upon a specimen from Dr. 

 Sixten Bock's station 59 hi the Bonin Islands, discussing the structure of the species, 

 based upon a study of this specimen, at considerable length hi 1924. 



EUDIOCRINUS SERRIPINNA A. H. Clark 



PLATE 12, FIGURE 49 

 [See also vol. 1, pt. 2, fig. 267 (arm), p. 207.] 



Eudiocrinus serripinna A. H. CLARK, Smithsonian Misc. Coll., vol. 52, 1908, p. 211 (description; 

 Albatross station 5136); Crinoids of the Indian Ocean, 1912, p. 102 (synonymy; locality); 

 Amer. Journ. Sci., vol. 40, 1915, p. 62 (listed); Unstalked crinoids of the Siboga-~E\ped., 1918, 

 p. 65 (in key; range), p. 71 (references; notes; stations 49a, 310; possibly only a variety of E. 

 indivisus), pp. 271, 276 (listed). 



Diagnostic features. Resembling E. indivisus, but the proximal pinnules are 

 very sharply triangular in section; on the proximal pinnules, especially on P a and P 2 , the 

 distal edges of the segments are very strongly produced at the prismatic angles dor- 

 sally, so that these pinnules have a strongly serrate dorsal profile. The arms are 

 40-65 mm. long, and there are 12-16 (usually 14-16) cirrus segments. 



Description. The centrodorsal is discoidal, with the rather broad dorsal 'pole 

 flat. The cirri are arranged in a partially double marginal row. 



The cirri are XIX, 12-16 (usually 14-15), 5-10 mm. in length. The first seg- 

 ment is short, the second is about as long as broad, and those following increase in 



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