A MONOGRAPH OF THE EXISTING CRENOIDS 49 



of the edge from which serrate ridges gradually extend themselves proximally until 

 they completely span the brachial, so that the brachials in the outer half of the arm 

 have a median longitudinal band of fine spines. 



Locality. East of Flinders Island, Bass Strait; 128-183 meters; Endeavour, De- 

 cember 4, 1913 [H. L. Clark, 1916; A. H. Clark, 1918 (Tasmania)] (2, M. C. Z., 717; 

 Australian Mus.). 



History. This species was described in 1916 by Dr. Hubert Lyman Clark from 

 two specimens that had been dredged by the Australian Fisheries Investigation ship 

 Endeavour east of Flinders Island in 70-100 fathoms on December 4, 1913. Dr. Clark 

 said that while this species resembles both C. komachi and C. helene in the general 

 character of the arms, the much more numerous cirrus segments, the longer pinnules, 

 and the markedly conical centrodorsal seem to prove that it is quite distinct. He 

 remarked that the genus was not known previously from Australian waters. 



In 1918 I listed this species as one of the crinoids known from Tasmanian seas. 



COSMIOMETRA ASTER (A. H. Clark) 



PLATE 6, FIGURE 21 

 [See also vol. 1, pt. 2, fig. 215, p. 159.] 



Antedon aster A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 145 (description; Albatross 

 station 5088). 



Thalassometra aster A. H. CLARK, Smithsonian Misc. Coll. vol. 50, pt. 3, 1907, p. 360 (listed) ; Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 310 (Sagami Bay) ; Amer. Nat., vol. 42, No. 500, 1908, p. 542 

 (belongs to a group characteristic of the oceanic area) ; Geogr. Journ., vol. 32, No. 6, 1908, p. 603 

 (same); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 14 (listed); Crinoids of the Indian Ocean, 

 1912, p. 206 (synonymy; locality). 



Thalassometra komachi A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 311 (description; Mi*aki), 

 p. 540 (listed); Unstalked crinoids of the Siboga-Exped., 1918, p. 155 (identity with [Cosmiometra] 

 aster) . 



Cosmiomelra komachi A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 17 (listed); Proc. 

 U. S. Nat. Mus., vol, 39, 1911, p. 549 (compared with C. philippinensis) ; Zool. Anz., vol. 39, 

 No. 11/12, 1912, p. 428 (arms compared with those of C. helene); Crinoids of the Indian Ocean, 

 1912, p. 214 (locality). H. L. CLARK, Biol. Res. Fishing Exper. F. I. S. Endeavour, 1909-14, vol. 

 4, pt. 1, 1916, p. 26 (comparison with C. dasybrachia) . 



Cosmiometra aster A. H. CLARK, Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, p. 215 (southern 

 Japanese species; range and its significance) ; Unstalked crinoids of the Si'boffa-Exped., 1918, p. 154 

 (in key; range), p. 155 (synonymy). GISLEN-, Zool. Bidrag Uppsala, vol. 9, 1924, fig. 176, p. 98 

 (articulation of a distal pinnule); Vidcnsk. Medd. Dansk naturh. Foren. K0benhavn, vol. 83, 

 1927, p. 3 (stations 15, 25; 180-720 meters), p. 41 (stations 15,25; notes), pp. 68, 69 (listed), 

 figs. 36, 37, p. 44; Kungl. Fysiogr. Pallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 20. 



Diagnostic features. A moderately slender species with 20 arms; the cirri, which 

 are arranged roughly in 15 closely crowded columns on the truncated conical or short 

 columnar centrodorsal, are nearly half as long as the arms; and the elements of the 

 division scries and first two brachials have the edges.all around everted and roughened, 

 the dorsal surface otherwise smooth. The arms are 125 mm. long and the cirri are 

 25-40 mm. long with 40-55 segments. 



Description. The centrodorsal is bluntly conical or short columnar with the cirrus 

 sockets arranged roughly in three closely crowded columns in each radial area, or 15 

 closely crowded columns, with two cirrus sockets to a column. The bare polar area is 

 granulose. 



