PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 475 



The interradial portions of the perisome of the disk bear numerous calcareous con- 

 cretions subequal in size which are entirely and rather widely separated from each other, 

 and are elevated above the general surface in the shape of thick papillae. 



P! is relatively large and stout and recalls P 2 in certain varieties of Oligometra 

 serripinna; it is 6 mm. long and is composed of 12 segments, of which the first is about 

 as long as broad and the remainder are about half again as long as broad; the outer 

 distal borders of the segments are everted and finely spinous. P 2 is 3 mm. long with 

 10 segments; it resembles P] but is proportionately smaller and the outer segments have 

 a greater development of spines. P 3 is 3 mm. long with 10 segments, more slender than 

 P 2 , the component segments more elongate with more strongly everted and more 

 spinous distal ends. The following pinnules resemble P 3 , but slowly increase in length. 

 The distal pinnules are 7 mm. long, very slender, with 19 segments, of which all but the 

 first two are greatly elongated with swollen articulations and overlapping and spinous 

 distal ends. 



P a is absent from 7 arms, and present on 3. 



Color in life.- According to a note by Mr. F. M. Chamberlain, the color in life is 

 pale orange and yellow. 



[NOTE BY A.M.C.] A manuscript record written by Mr. Clark is of a small speci- 

 men taken by the Danish Expedition to the Kei Islands, with arms 25 mm. long and 

 with the longest cirri measuring 10 mm. in length with 28 segments. Since the known 

 specimens of E. rubra have the arms 25 to 35 mm. long and the cirri 10 mm. with up to 

 30 segments, the characters used in the key for distinguishing australis and rubra are 

 obviously of little use in dealing with specimens of comparable size. The differences 

 in proportions of the various ossicles are probably explicable by the different sizes of 

 the type specimens and it seems to me most likely that the Japanese and East Indian 

 specimens will prove to be conspecific when more material has been taken. 



Locality. Albatross station 5617; Moluccas; Dodinga Bay, Gilolo Island; Ternate 

 Island (S.E.) bearing S. 45 W., 7 miles distant (lat. 049'30" N., long. 12725'30" E.); 

 239 meters; November 27, 1909 [A. H. Clark, 1918] (1, U.S.N.M., 36050). 



Danish Expedition to the Kei Islands, sta 41; 245 meters; April 25, 1922 (1, C.M.). 



Geographical distribution. Recorded only from the Moluccas and Kei Islands. 



Bathymetrical range. Recorded from 239 and 245 meters. 



ERYTHROMETRA RUBRA (A. H. Clark)' 



FIGURE 22 



[See also vol. 1, pt. 1, figs. 288 (p. 262), 504 (p. 371); pt. 2, figs. 87, 88 (p. 53), 666, 667 (p. 329), 753 



(p. 349)] 



Antedon ruber A. H. CLARK, Proc. U.S. Nat. Mus., vol. 33, 1907, p. 146 (description; Albatross sta. 

 4894). 



Cyllometra ruber A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 357 (listed). 



Erylhromelra ruber A.. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 127 (listed); Proc. 

 U.S. Nat. Mus., vol. 34, 1908, p. 316 (Sagami Bay); Vid. Medd. Nat. Foren. K0benhavn, 1909, 

 p. 190 (south of the Goto Is., 105 fms.; description of a specimen) ; Crinoids of the Indian Ocean, 



1912, p. 233 (synonymy; southern Japan, 55-105 fins.); Proc. Biol. Soc. Washington, vol. 26, 



1913, p. 179 (range in eastern Asia); Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, p. 215 

 (southern Japanese species; range and its significance) ; Unstalked crinoids of the Siboga-Exped., 1918, 



*Utinomi and Kogo (see Addenda for 1965) have good figures of a Japanese specimen, including 

 a cirrus with 29 segments. 

 556-622 67 32 



