S. I. Smith — Crustaceans of the Atlantic Coast. 
133 
In the following list of the twenty-three species belonging to the 
fauna between 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 
s, but some of the Cumacea thus i 
be arctic species. 
Geryon quinquedens. 
s Cancer irroratus. 
S G. borealis. 
a Chionoecetes opilio. 
Parapagurus pilosimanus. 
Munidopsis curvirostra. 
s Homarus Amerieanus. 
Axius serratus. 
A Nectocrangon lar. 
a Hippolyte Fabricii. 
A H. macilenta. 
England coast are indicated by an 
ndicated may very likely prove to 
a Ilippolyte Groenlandica. (9.) 
Meterythrops robusta. 
Psendomma truncatam. 
s Mysis stenolepis. 
s Diastylis politus. 
s D. sculptus. 
s D. quadrispinosus. 
s D. abbreviates, 
s Eudorella hispida. 
s E. pusilla. 
E. integra. 
S Laraprops quadriplicata. 
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 Greenlandie 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, and have 
given in foot-notes the principal synonyms, the most important refer- 
