PART 5 A MONOGRAPH OF THE EXISTING CRESTOIDS 793 



Princesse- Alice station 486; off northwestern Spain (lat. 4353'30" or 4352'00" 

 N., long. 902'15" or 905'45" W.); 1674 meters; fine sand and foraminifera; August 

 21, 1894 [Koehler, 1909]. 



Travailleur station 42; Bay of Biscay Gat. 4401'20" N., long. 704'45" W.); 

 896 meters; mud and coral; August 16, 1881 [Perrier, 1883, 1886, 1893; P. H. Carpenter, 

 1885, 1888; Koehler and Vaney, 1910] (fragments, P.M.). Type locality. 



Travailleur station 396; off northwestern Spain Qat. 4405'45" N., long. 932'30" 

 W.); 1037 meters; black sand and coral; August 15, 1881 [Koehler and Vaney, 1910] 

 (2, P.M.). 



Caudan station 11; Bay of Biscay (lat- 4436' N., long. 425' W.); 650 meters 

 [Koehler, 1896]. 



Thor station 74; southwest of Ireland (lat. 4923' N., long. 1213' W.); 1220 

 meters; June 9, 1906 (1, C.M.). 



Helga station S.R. 506; off the western coast of Ireland Gat. 5034' N., long. 

 1119' W.); 1209-1229 meters; September 12, 1907 [A. H. Clark, 1913] (2, U.S.N.M., 

 36282; Dublin M.). 



Helga station S.R. 331; off the western coast of Ireland Gat. 5112' N., long. 11 

 55' W.); 1116-1243 meters; May 9, 1906 [A. H. Clark, 1913] (1, Dublin M.). 



Helga station S.R. 489; off the western coast of Ireland Gat. 5135' N., long. 

 1155'W.); 1317 meters; September 3, 1907 [A. H. Clark, 1913;Gislen, 1928] (1,B. M.). 



Geographical range. Lesser Antilles; from the Canary Islands and the coast of 

 Morocco northward to the western coast of Ireland. 



Bathymetrical range. From 607 to 2115 meters; the average of 13 records is 1180 

 meters. 



Thermal range. Two records, 7.50 C. and 11.0 C. 



History. This species was briefly described by M. Edmond Perrier in 1883 from 

 15 specimens which had been dredged by the Travailleur in the Bay of Biscay in the 

 summer of 1881. The record was notable not only in indicating for the first time the 

 presence of this genus in the Atlantic, but also because of the relatively large number of 

 individuals secured, there being at the time only 10 others, representing 3 species, in 

 existence, 2 in Berlin and 8 in London. In 1886 Prof. Perrier included a figure of this 

 new form in a popular work on submarine exploration, which was reprinted in 1891. 

 Unfortunately this figure is quite inaccurate and especially gives a very erroneous idea 

 of the relative proportions of the arms and cirri. 



In 1896 Prof. Rene Koehler recorded from the dredgings of the Caudan, also in 

 the Bay of Biscay, a single mutilated specimen of some species of Pentametrocrinus 

 which he said was without doubt P. atlanticus. 



In 1909 Prof. Koehler published a very detailed account of this species, which he 

 redescribcd and accurately figured for the first time, based upon 3 specimens which had 

 been obtained by the Prince of Monaco's yacht Princesse- Alice, as well as upon a re- 

 examination of all those previously secured by the Travailleur and the Caudan. In 

 the following year, in association with Prof. C. Vaney, he listed the localities at which 

 it had been secured by the Travailleur and the Talisman in. 1881 and 1883. 



While in Paris in 1910 I examined all of the specimens preserved in the museum 

 there, and a few weeks later, during a visit to Lyon, Professor Koehler was so kind as to 

 show me all his material. 



