A MONOGRAPH OF THE EXISTING CRINOIDS 29 



In 1915 the new genus Daidalometra was created for its reception, and in 1916 the 

 range was again given. In my memoir on the unstalked crinoids of the Siboga ex- 

 pedition published in 1918 it was included in a key to the species of the genus Daidalo- 

 metra, and was listed with its range and synonymy. In 1922 Prof. Torsten Gisl6n 

 compared it with his new species Stenometra dentata. 



Genus STYLOMETRA A. H. Clark 



Antedon (part) P. H. CARPENTER, Bull. Mus. Comp. Zool., vol. 9, No. 4, 1881, p. 158, and following 

 authors. 



Thalassomeira (part) A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 360. 



Slylometra A. H. CLARK, Bull. Mus. Comp. Zool., vol. 51, No. 8, 1908, p. 245 (characters; genotype 

 Antedon kpinifera P. H. Carpenter, 1881) ; Proc. U. S. Nat. Mus., vol. 34, 1908, p. 211 (referred to 

 the Thalassometridae), p. 212 (occurs in the West Indies); Amer. Nat., vol. 42, No. 500, 1908, 

 p. 542 (characteristic oceanic genus); Geogr. Journ., vol. 32, No. 6, 1908, p. 603 (same); Proc. 

 Biol. Soc. Washington, vol. 22, 1909, p. 14 (listed, with its component species); Proc. U. S. Nat. 

 Mus., vol. 40, 1911, p. 10 (represents in the West Indies the East Indian Cosmiometra) ; Crinoids 

 of the Indian Ocean, 1912, p. 13 (corresponds to the East Indian Cosmiometra) ; Internat. Rev. 

 Gesamt. Hydrobiol. Hydrogr., 1914, pp. 4 and following (represents Cosmiometra in the Atlantic; 

 range); Die Crinoiden der Antarktis, 1915, p. 181 (range; corresponds to the East Indian Cosmio- 

 metra); Unstalked crinoids of the Siboja-Exped., 1918, p. 147 (in key; range), p. 156; Univ. 

 Iowa Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 12 (confined to the West Indies), p. 19 (in key) ; 

 The Danish /nffoJ/-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 40 (range), p. 51 (in key). GISLEN, 

 Zool. Bidrag Uppsala, vol. 9, 1924, pp. 74, 100. BOONE, Bull. Bingham Oceanographic Coll., 

 vol. 1, art. 4, April 1928, p. 3. GISLEN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 

 1934. 



Diagnosis. A genus of Thalassometridae in which the division series, which are 

 all 2, and arm bases are rather strongly and evenly rounded dorsally, with the edges of 

 the ossicles armed with numerous stout spines, which may occur on the dorsal surface 

 also; and the brachials beyond the more or less oblong or quadrate proximal ones are 

 strongly carinate, the carination taking the form of a long, broad, curved, overlapping 

 spine. The 20-30 arms are 65-140 mm. long, and the slender cirri are 35-50 mm. long 

 with 40-80 segments. 



Geographical range. From the Bahamas and Greater Antilles westward to Cozumel 

 Island, off Yucatan, and eastward and southward along the Antillean chain to Grenada. 



Bathymetrical range From 102 to 508 (?548) meters. 



Tliermal range. From 8.33 to 23.6 C. 



Remarks. The genus Stylometra includes only a single species, S. spinifera. It is 

 the somewhat modified Atlantic representative of the widespread Indo-Pacific genus 

 Cosmiometra. 



History. The genus Stylometra was established in 1908 with the genotype Antedon 

 spinifera P. H. Carpenter, 1881. In my first revision of the old genus Antedon pub- 

 lished in 1907 Antedon spinifera had been referred to the genus Thalassometra. There 

 has been no change in the status of the genus Stylometra since it was first established. 



