S. J. Smith — Crustaceans of the Atlantic Coast. 133 



In the following list of the twenty-three sjjecies belonging to the 

 fauna betAveen Cape Cod and Labrador and not known to be Euro- 

 pean, those which are known to be true arctic species are indicated by 

 an A ; those which extend south of Cape Cod and appear to have their 

 center of distribution on the New England coast are indicated by an 

 s, but some of the Cumacea thus indicated may very likely prove to 

 be arctic sjDecies. 



Geryon quinquedens. 

 S Cancer irroratus. 

 s C. borealis. 

 A. Chionoecetes opilio. 



Parapagurus pilosimanus. 



Munidopsis curvirostra. 

 s Homarus Americanus. 



Axius serratus. 

 A Nectocrangon lar. 

 A Hippolyte Fabricii. 

 A H. macilenta. 



A Hippol\i;e Grcenlandica. (9.) 



Meterythrops robusta. 



Pseudomma truncatum. 

 s Mysis stenolepis. 

 S Diastylis politus. 

 s D. sculptus. 

 s D. quadrispinosiis. 

 s D. abbreviatiis. 

 S Eudorella hispida. 

 S E. pusilla. 



E. Integra. 

 s Lamprops quadriplieata. 



Excepting Axius serratus (which will very likely prove to be spe- 

 cifically identical with the European species), the species not prefixed 

 by either a or s, are all new or recently described and little is yet 

 known of their geographical range, but they are probably arctic 

 species. It is worthy of notice that, of the five species known to 

 be arctic and not known to be European, all are Greenlandic and 

 all but one {Hippolyte macilenta) are also known to occur on the 

 western coast of North America, in the region of Bering Sea. These 

 four species, common to both the northern Atlantic and northern 

 Pacific coasts of North America are all conspicuous forms not likely 

 to escape detection, and their geographical distribution apparently 

 indicates that there are a certain number of arctic American species 

 which are not European — perhaps because they are too arctic to be 

 European. 



The relation of the Thoracostracan Fauna of Greenland to that of 

 the rest of North America and to that of Europe. 



In order to exhibit clearly the similarity of the relation of the 

 Thoracostracan fauna of Greenland, on the one hand, to the fauna of 

 the rest of the North American seas, and, on the other hand, to that 

 of the European seas, I have compiled the following list of the species 

 of Thoracostraca known to inhabit the Greenland const, nnd have 

 given in foot-notes the j^rincipal synonyms, the most important refer- 



