368 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Geographical range. — From the Kei Islands to southwestern Timor. 



Bathymetrical range. — From 245 to 520 meters. 



History. — Antedon parvipinna was described and figured by Dr. P. Herbert Car- 

 penter in his report on the comatulids of the Challenger Expedition published in 1888 

 on the basis of a single specimen from station 192. Dr. Clemens Hartlaub in 1895 

 discussed its systematic and bathymetrical relationships, and in 1907 it was listed by 

 Dr. Otto Hamann. 



In my first revision of the old genus Antedon published in 1907 parvipinna was 

 removed to the new genus Charitometra, and in my revision of the families Thalasso- 

 metridae and Himerometridae published in 1909 it was assigned to the new genus 

 Strotometra. In my memoir on the crinoids of the Indian Ocean published in 1912 

 Strotometra parvipinna was listed and the synonymy and locality were given. In 

 1913 I published a brief note on the type specimen from Challenger station 192 which I 

 had examined at the British Museum in 1910, comparing it with S. hepburniana. In 

 1918 in my memoir on the unstalked crinoids of the Siboga Expedition parvipinna 

 was included in the key to the species of Strotometra, and one specimen was recorded 

 from station 254 and six from station 297, notes being given on some of the latter. 



Prof. Torsten Gislen in 1928 gave additional notes on the type specimen in the 

 British Aluseum, and in 1934 he classified the arm division of Strotometra parvipinna 

 as belonging to the Monachometra fragilis type I. 



STROTOMETRA HEPBURNIANA (A. H. Clark) 



Plate 31, Figures 95, 96; Plate 32, Figure 104 

 [See also vol. 1, pt. 2, figs. 232, p. 192, 808-811, p. 385.] 



Antedon hepburniana A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 139 (description; Albatross 

 station 4890). 



Charitometra hepburniana A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 361 (listed); 

 Proc. U. S. Nat. Mus., vol. 34, 1908, p. 318 (Japan); Geogr. Journ., vol. 32, No. 6, 1908, p. 603 

 (type of a non-oceanic group). 



Strotometra hepburniana A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 20 (listed); Vid. 

 Medd. Nat. Foren. K0beuhavn, 1909, p. 187 (south of the Goto Islands, 100 fathoms; descrip- 

 tion; comparison with the type) ; Crinoids of the Indian Ocean, 1912, p. 226 (synonymy; locality) ; 

 Proc. Biol. Soc. Washington, vol. 26, 1913, p. 179 (range in eastern Asial; Smithsonian Misc. 

 Coll., vol. 61, No. 15, 1913, p. 50 (comparison with S. parvipinna); 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, p. ix (relationship with S. parvipinna), p. 192 (in key; 

 range), p. 194 (references); Smithsonian Misc. Coll., vol. 72, No. 7, 1921, pi. 2, fig. 28 (side 

 plate). 



Diagnostic features. — The cirri are short and stout, the longest segments slightly 

 longer than broad and not constricted centrally; the expanded portion of the genital 

 pinnules is preceded by two unmodified segments so that it appears sessile; tbe segments 

 of the pinnules in the proximal portion of the arms have conspicuously flaring and over- 

 lapping distal ends so that the pinnules appear very rough; Pi is 3.5 mm. long with 

 10-11 segments; the arms are 45 mm. long; and the cirri have 10 segments. 



Description. — The centrodorsal is low-hemispherical without intenadial processes 

 and with the large dorsal pole roughened. There is a single row of 10 cirrus sockets, 

 two to each radial area. 



