A MONOGHAPH OF THE EXISTING CRINOIDS 27 



History. This species was originally described in 1909 under the name of Steno- 

 meira arachnoides from a specimen from Albatross station 5154. At the same time I 

 noted that: 



A much mutilated specimen found in a jar with a specimen of Amphimetra discoidea (and therefore 

 probably taken in shallow water), from Port Denison, Australia, certainly belongs to this genus, and 

 possibly to this species. It is slightly smaller than the type, with the keels less produced, and with the 

 epinous edges of the lower joints less pronounced, differences which are in all probability due to 

 immaturity. 



I remarked that the occurrence in the East Indian region of a littoral species of 

 Thalassometridae, a family there and elsewhere especially characteristic of the deep 

 water "Oceanic" faunal division is a fact of very considerable interest. In a memoir 

 on the recent crinoids of Australia published in 1911 I noted that a specimen of Stire- 

 metra arachnoides was found in the jar containing the type specimen of Amphimetra 

 discoidea. The United States National Museum had received these crinoids many 

 years before in exchange from the Australian Museum. They were collected at Port 

 Denison. In my report on the crinoids collected by the Hamburg Southwest Australian 

 Expedition in 1905, which was published in 1911, I listed Stiremetra arachnoides and 

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

 Stiremetra arachnoides was included, and the synonymy and range were given. In 1912 

 I gave a brief diagnosis of a new species, Stenometra acuta, from Siboga station 294. 

 In 1915 I again gave the range of Stiremetra arachnoides. In 1916 I described the new 

 genus Daidalometra and listed Daidalometra arachnoides as one of the two included 

 species. In my report upon the unstalked crinoids of the Siboga Expedition published 

 in 1918 I recorded four specimens of Daidalometra arachnoides from station 166 and six 

 specimens from station 294. Under Daidalometra arachnoides I included Stenometra 

 acuta, originally described from a specimen from station 294, as a synonym. 



DAIDALOMETRA HANA (A. H. Clark) 



PLATE 4, FIGDHE 13 

 [See also vol. 1, pt. 1, fig. 212, p. 153.] 



Anledon hana A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 137 (description ; Albatross station 



4903). 

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



U. S. Nat. Mus., vol. 34, 1908, p. 318 (Japan). 

 Stenometra hana A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 15 (listed) ; Zool. Anz., 



vol. 39, No. 11/12, 1912, p. 428 (compared with S. acuta [Daidalometra arachnoides]) ; Crinoids of 



the Indian Ocean, 1912, p. 210 (synonymy; locality). 

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



Japanese species ; range and its significance) ; vol. 6, No. 5, 1916, p. 116 (range) ; Unstalked crinoids 



of the Siboga-Exped., 1918, p. 157 (in key; range; references). GISLN, Nova Acta Reg. Soc. 



Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 118 (compared with Stenometra dentata). 



Diagnostic features. The cirri are slender and long, more than two-thirds the arm 

 length, with 68-77 segments; and the elements of the division scries and first two bra- 

 chials have a rather low and strongly rounded median carination and their borders are 

 little or not at all modified. The 10-11 (usually 10) arms are 60 mm. long, and the cirri 

 are 40-45 mm. long. 



