100 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



on Kecent African crinoids published in 1911 Crotalometra magnicirra was listed, and 

 the synonymy and range were given. 



In my description of Thalassometra marginalis published in 1912 I said that it is 

 closely related to Th. magnicirra, and in my memoir on the crinoids of the Indian 

 Ocean published later in the same year I listed Thalassometra magnicirra, giving the 

 synonymy and range. 



In a paper on the crinoids of the British Museum published hi 1913 I listed six 

 specimens of Crotalometra magnicirra from stations Nos. 12885/6 and gave notes on 

 them; I also listed one specimen from station 12792. In my memoir on Antarctic 

 crinoids published in 1915 I noted that "Crotalometra magnicirra (Thalassometridae) 

 wurde bei East London, Kapland, in 540-810 m. (300-450 Faden) gefunden." In 

 my memoir on the unstalked crinoids of the Siboga expedition published hi 1918 

 magnicirra was inserted in the key to the species of Crotalometra and the range and 

 synonymy were given. 



Dr. Hubert Lyman Clark hi his memoir on the echinoderms of South Africa 

 published in 1923 said that Crotalometra magnicirra "is not now in the South African 

 Museum, the original specimens having apparently all been retained at the British 

 Museum. It was taken hi 300^50 fathoms, 15-20 miles off the coast of Cape Colony, 

 near East London." 



After examining the specimens in the British Museum, Prof. Torsten Gisle"n 

 wrote hi 1928 that in Crotalometra magnicirra the radials are concealed, the niter- 

 radial prominences of the centrodorsal are rather stout and large, and there are 

 usually 20 arms. He suggested that C. marginalis is probably a large specimen of 

 C. magnicirra. 



In my report upon the crinoids of the John Murray Expedition to the Indian Ocean 

 hi 1933-34, published on January 1, 1937, I gave the range of Crotalometra magnicirra 

 and discussed its zoogeographical significance. 



KOEHLERMETRA, gen. nov. 



Antedon (part) P. H. CARPENTER, Philos. Trans. Roy. Soc., vol. 174, 1883, 1884, p. 921, and following 



authors. 



Actinometra (part) P. H. CARPENTER, Challenger Reports, Zool., vol. 26, pt. 60, 1888, pp. 305, 306. 

 Thalassometra (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 126. 

 Antedon (Crotalometra) KOEHLER and VANET, Bull. Mus. Hist. Nat. Paris, 1910, No. 1, p. 26. 

 Crotalometra (part) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, pp. 8, 37. 



Diagnosis. A genus of Thalassometridae in which the arms are dorsally rounded to 

 the tip; the arms in fully developed individuals are 20 in number with the IIBr series 

 4(3+4), exceptionally 2; the division series and arm bases are smooth and without 

 spines; the first syzygy in arms following a IIBr 4(3+4) series is between brachials 2 + 3; 

 the cirri, which are very stout, are recurved distally with the outer segments carinate 

 or with dorsal spines; and the genital pinnules are not appreciably expanded. The 

 included species are large and very stout with the 20 arms about 150 mm. long, and the 

 cirri up to 55 mm. long with 30-50 segments. 



Genotype. Antedon porrecta P. H. Carpenter, 1888. 



Geographical range. From Ascension Island to the northern part of the Bay of 

 Biscay. 



Bathymetrical range. From 753 to 1,410 meters. 



