REPORT ON THE CRINOIDEA. 373 



fathoms belongs to this group ; and it was obtained at two localities, one in the Southern 

 Ocean (2600 fathoms), and one in the North Pacific (2900 fathoms). 



The only species of Actinometra which extends downwards into the abyssal zone is 

 common among the Caribbean Islands, and also occurs in the continental region of the 

 East Atlantic. 



Eudiocrinus atlanticus may possibly extend into the abyssal zone, but we have no 

 definite information on this subject as yet (see p. 79) ; while Eudiocrinus japonicus from 

 563 fathoms in the North Pacific may possibly also occur as a continental species in Japanese 

 seas, for Dr. Hilgendorf thinks that his specimen was dredged from 300 or 400 fathoms. 



The following list, containing the names of one hundred and twenty species of 

 Antedon and forty-eight species of Actinometra, embodies the result of our present 

 knowledge of the Coniatulidas. But many species are still awaiting description, and the 

 geographical range of others will be greatly extended when the large collections in many 

 European museums have undergone a critical revision. 



On the other hand it is more than probable that some of the names in the following 

 list will eventually be reduced to the rank of synonyms. Thus, for example, I strongly 

 suspect that Actinometra meridionalis is identical with the Comatula echinoptera of 

 Midler, while I have no doubt whatever that some of the following are not good species, 

 Antedon diibcni, Antedon hageni, Antedon milleri, Antedon petasus, and Antedon 

 rosacea. But the time has not yet come for a discussion of their mutual relations. 



A List of the known Living Species of Comatul.e, showing their 

 Bathymetrical and Geographical Distribution. ■ 



Explanation of the Letters used. 



A. Species discovered by the " Blake," and other U. S. ships. 



B. Previously known species collected by the " Blake," &c. 



C. Species discovered by the Challenger. 



D. Previously known species collected by the Challenger. 



E. Species discovered by the Arctic Expedition, 1875-76. 



F. Previously known species collected by the Arctic Expedition. 



G. Species discovered by H. M.S. "Alert," 1878-82. 

 H. Previously known species collected by the " Alert."' 



K. Species discovered in the Philippine Islands by Professor Semper. 



L. Previously known species collected by Professor Semper. 



N. Previously known species collected by the " Voriugen " (Norwegian). 



