100 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



on Recent African erinoids 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 erinoids of the Indian 

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

 synonym; and range- 

 In a paper on the erinoids of the British Museum published in 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 

 erinoids 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 erinoids of the Siboga expedition published in 1918 

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

 synonymy were given. 



Dr. Hubert Lyman Clark in 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 in 300-450 fathoms, 15-20 miles off the coast of Cape Colony, 

 near East London." 



After examining the specimens in the British Museum, Prof. Torsten Gisl6n 

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

 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 erinoids of the John Murray Expedition to the. Indian Ocean 

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

 and discussed its zoogeographical significance. 



KOEHLERMETRA, gen. nov. 



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



authors. 

 Actinometra (part) P. H. Carpenter, Challenger Reports, Zoo]., vol. 2G, pt. 60, 1888, pp. 305, 300. 

 Thalassometra (part) A. 11. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 126. 

 Anledon (Crotalometra) Koehler and Vaney, 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 arc dorsally rounded to 

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

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

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

 I he 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 Bpecies 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. 



Qenotype. — Anledon porrecta P. 11. Carpenter, 1888. 



Geograjihical range. — From Ascension Island to the northern part of the Bay of 

 Biscay. 



Bathym< triad range. — From 753 to 1,410 meters. 



