A MONOGRAPH OF THE EXISTING CRINOIDS 297 



(systematic position). A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 30 (synonym 

 of brachiolata); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, p. 89 (B. M., MS. = Comatulella 

 brachiolata) . 



Actinometra brachiolata P. H. CARPENTER, Trans. Linn. Soc. (Zool.), ser. 2, vol. 2, 1879, p. 27 

 (systematic position). BELL, Proc. Zool. Soc. London, 1882, p. 533 (listed); p. 535 (specific 

 formula). P. H. CARPENTER, Proc. Zool. Soc. London, 1882, 1883, pp. 735 and following 

 (discussion of Bell's method of formulation and corrected formula) ; Challenger Reports, Zool- 

 ogy, vol. 26, pt. 60, 1888, pp. 57, 59, 278, 283, 366, 380. HAHTLAUB, Nova Acta Acad. Ger- 

 man., vol. 58, No. 1, 1891, p. 107 (dry specimen in the Leyden Mus. without locality; char- 

 acters). HAMANN, Bronns Klassen u. Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 

 1583 (listed). A. H. CLARK, Die Fauna Siidwest-Australiens, vol. 3, Lief. 13, 1911, p. 436 

 (specimen recorded by Hartlaub is Comatula peclinata); Memoirs Australian Mus., vol. 4, 

 1911, p. 716 (credited to Australia by P. H. Carpenter); p. 718 (Hartlaub's record); Crinoids 

 of the Indian Ocean, 1912, pp. 35, 38, 112 (identity of previous records); Smiths. Miscell. 

 Coll., vol. 61, No. 15, 1913, p. 75 (Amphimelra discoidta found under this name in the British 

 Museum). 



Actinometra rosea P. H. CARPENTER, Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 517; Proc. Zool. 

 Soc. London, 1882, 1883, p. 747 (specific formula); Challenger Reports, Zoology, vol. 26, pt. 

 60, 1888, p. 278 (no characters separate this form from brachiolata). A. H. CLARK, Proc. 

 U. S. Nat. Mus., vol. 43, 1912, p. 385 (identity). 



Comatulella brachiolata A. H. CLARK, Amer. Journ. Sci., ser. 4, vol. 32 (old ser., vol. 182), No. 188, 

 Aug. 1911, p. 130 (significance of distinctive characters); Die Fauna Siidwest-Australiens, vol. 

 3, Lief. 13, 1911, p. 436 (entirely different from the broad-armed variety of Comatula pecti- 

 nata with which it was confused by Hartlaub); p. 441 (south Australia north to Perth and 

 Port Phillip) ; p. 443 (range on the east coast) ; p. 444 (range on the west coast) ; p. 447 (locali- 

 ties; descriptions of specimens; discussion of the broadening of the arms and pseudobiserialism) ; 

 p. 465 (association with other species); Proc. U. S. Nat. Mus., vol. 43, 1912, p. 381 (specimen 

 from Koombana Bay in U.S.N.M.); p. 383 (includes Alecto rosea J. Miiller, 1841); p. 385 (in- 

 cludes Actinometra rosea P. H. Carpenter, 1888); p. 387 (detailed description; range); Crinoids 

 of the Indian Ocean, 1912, p. 9 (confined to south Australia); pp. 30, 35 (identity of previous 

 records); Die Fauna Siidwest-Australiens, vol. 4, Lief. 6, 1913, p. 307, pi. 4, figs. 1, 2; Smiths. 

 Miscell. Coll., vol. 61, No. 15, 1913, p. 7 (Port Phillip); Records of the Western Australian 

 Mus., vol. 1, pt. 3, 1914, p. 114 (collected by the Endeavour in Western Australia); p. 115 

 (south Australian species; occurrence in the vicinity of Perth established); p. 117 (between 

 Fremantle and Geraldton; characters of the specimen; discussion of ungrooved pinnules, and 

 of pinnules in general); Die Crinoiden der Antarktis, 1915, p. 124 (exhibits same characteristics 

 as Solanometra anlarctica) ; p. 167 (range) ; Internat. Revue d. gesamt. Hydrobiol. u. Hydrogr,. 

 1915, p. 226 (detailed account of the distribution in Australia). HARTMEYER, Mitt. zool. Mus. 

 Berlin, vol. 8, Heft 2, 1916, p. 233 (southwest Australia, No. 5967). MORTENSEN, Studies in 

 the Development of Crinoids, 1920, p. 81, and footnote, p. 81 (prehensile pinnules) . A. H. 

 CLARK, Smiths. Miscell. Coll., vol. 72, No. 7, 1921, p. 7 (pinnules). GISLEN, Zool. Bidrag fran 

 Uppsala, vol. 9, 1924, p. 56 (biseriality) p. 96 (pinnule articulations). 



Diagnostic features. The massive centrodorsal bearing cirri with more than 

 30 very short segments, the broad, short, rapidly tapering arms, and the occasional 

 occurrence of stout grooveless pinnules among the slender distal pinnules easily 

 distinguish this species from all its relatives. 



Description. The centrodorsal is very large and massive, thick discoidal, with a 

 very slightly convex polar area 7 mm. in diameter. The cirrus sockets are arranged 

 in a single crowded and slightly irregular marginal row. 



The cirri are XX-XXII, 32-34, 15 mm. long, rather slender, decreasing slightly 

 in lateral width from the base to about the eighth segment, then remaining of the 



