PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 107 



less specialized than Antedon); vol. 40, 1911, p. 10 (closely related to the Atlantic Anledon), p. 14 

 (not known from the Arabian Sea, but possibly exists there); in Michaelsen and Hartmeyer, 

 Die Fauna Sudwest-Australiens, vol. 3, Lief. 13, Crinoidea, 1911, p. 449 (barely separable from 

 Antedon); INIem. Australian Mus., vol. 4, 1911, p. 725 (absent from Austraha), p. 726 (closely 

 related to Ajifedon) ; Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 31 (compared with 

 Euantedon); Crinoids of the Indian Ocean, 1912, p. 9 (does not occur in the area of maximum 

 intensity of the East Indian fauna; absent from Australia), p. 10 (absent from Japan; reason), 

 p. 11 (represented at Ceylon), p. 13 (relation to Antedon), p. 25 (range), p. 63 (in key), p. 227 

 (reference; type); Internat. Revue gesamt. Hydrobiol. und Hydrogr., 1914, p. 5 (eastern repre- 

 sentative of Antedon; range); in Michaelsen and Hartmeyer, Beitrage zur Kenntnis der Meeres- 

 fauna Westafrikas, Echinod. II, Crinoidea, 1914, p. 313 (relation to Antedon; has 2 species; 

 range); Die Crinoiden der Antarktis, 1915, p. 181 (range; represents, in part, Antedon of the 

 Atlantic); Smithsonian Misc. Coll., vol. 65, No. 10, 1915, p. 16 (phylogenetic study); Journ. 

 Washington Acad. Sci., vol. 7, No. 5, 1917, p. 127 (referred to the Autedoninae); No. 16, p. 505 

 (in key; range); Unstalked Crinoids of the Siboga-Exped., 1918, p. viii (with Euantedon represents 

 Antedon in the east), p. 197 (in key), p. 198 (key to the included species). 



Diagnosis. — A genus of Antedoninae in which Pj is very long, becoming very 

 slender and flagellate distally, composed of 30 to 40 segments; P2 resembles Pi and is 

 about two-tbirds as long (and a third again as long as P3), with at least four-fifths as 

 many segments; P3 is of tlie same length and character as the succeeding pinnules; 

 the segments of the lower and middle pinnules have unmodified distal edges. 



Type species. — Mastigometra flagellijera A. H. Clark, 1908. 



Geographical range. — From Ceylon eastward to the Society Islands. 



Bathymetrical range. — From the shore line do\vn to 48 meters. 



[Note by A.M.C] Though this genus may be the Indo-West Pacific counterpart 

 of the North Atlantic Antedon it has been collected very seldom. Of the three species 

 only one, M. micropoda, is known from more than a single specimen and but five speci- 

 mens of that have been recorded. This rarity is probably due in part to the competi- 

 tion in the littoral Indo-West Pacific with the numerous species of Oligophreata. 



KEY TO THE SPECIES OF M.iSTIGOMETRA 



[modified by A. M. C] 



a'. Cirri very numerous, at least L, centrodorsal low hemispherical. 



6'. Pi about 25 mm. long, P2 about 16 mm. (locality unknown) flagellifera (p. 107) 



fc2. Pi about 15 mm. long, P. about 9 mm. (Ceylon; 0-47 meters) micropoda (p. 109) 



a'. Cirri less than L, centrodorsal almost discoidal (Tahiti; littoral) pacifica (p. 110) 



MASTIGOMETRA FLAGELLIFERA A. H. Clark 



[See vol. 1, pt. 2, fig. 750, p. 349] 



Mastigometra flagellifera A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 229 (description; 



locaUty unknown); Vid. Medd. Nat. Foren. K0benhavn, 1909, p. 128 (relationships), p. 191 



(probably East Indian); Crinoids of the Indian Ocean, 1912, p. 227; Unstalked Crinoids of the 



Si6o!7a-Exped.,1918, p. 198 (in key; range; references). 

 Antedon flagellifera A. H. Clark, Vid. Medd. Xat. Foren. K0benha\m, 1909, p. 117 (unpublished 



MS. name of Liitken). 



Diagnostic features. — The L-LXXX cirri have about 15 segments of whicli the 

 distal are from a third to half again as long as broad; P, is 25 mm. long, with 40 seg- 

 ments; P2 is 16 mm. long, with 35 segments; P3 is from 10 to 12 mm. long, with 25 

 segments. 



