(^jmononuis und nllud Cienpra. 571 



the species i\'t'eiTcd by their authors to this genus — namelv, 

 C. dromioicles, Ortmann, from Japan, and C. granulata, 

 Rathbuu, from oft" tlic island of Trinidad — may possibly 

 belong to the next. 



0. Clythrockrus, Bouvier, at present stands for two 

 species from the West Indies and adjoining coast of North 

 America as far as 32° N., and inhabiting the sublittoral zone 

 at a depth of 50 to 262 fathoms. 



7. Cymonomus, a. Milne-Edwards. — Perhaps six species 

 may be assigned to this genus, their bathymetrical ran'j;e 

 being from lOi to 1380 fathoms. Their area of distribution 

 includes the Caribbean Sea, the eastern part of the North 

 Atlantic from Iceland to the Arguin Bank off the Sahara 

 (about 21° N.), the western part of the Mediterranean Sea, 

 the east coast of Equatorial Africa, and the Andaman Sea. 



8. Cymopolus, a. Milne-Edwards, includes two species, 

 one from 75 fathoms off the coast of Florida, the other from 

 the West Indies (Montserrat), 148 fathoms. 



9. CoRYCODUs, A. Milne-Edwards, receives a single species 

 from the West-Indian region and dredged in 175-250 fathoms. 



10. Cymonomops, Alcoek, rests upon a single species 

 found in the landlocked basin of the Andaman Sea at 265 

 and -J 05 fathoms. 



The foregoing summary of the facts of distribution seems 

 to nic to support the opinion of Bouvier that the family 

 Dorippidse "appears to have had its centre of origin and. 

 dispersal in the Caribbean region.^' It further seems to 

 suggest an answer to the question whether the dispersion 

 has been westwards by way of the Pacific or eastwards by 

 way of the Atlantic. Of any emigration westwards through 

 the Pacific we find very little evidence, while in the other 

 direction the grouping of the family, on the one hand, in 

 what may roughly be callrd the Panama and West-Indian 

 region, and, on the other hand, in the seas of the Oriental 

 region (India to Japan and Australia), with a halfway-house 

 in the eastern part of the Norrh Atlantic and the Western 

 Mediterranean, seems capable of only one interpretation — 

 riamrlv. an oprn-sea connexion in the direction indicated by 



35* 



