S. J. Smith — Crustaceans of the Atlantic Coast. 127 



appear to be represented in the European Seas. Of the five other 

 species recorded from Cape Cod Bay, all are common far to the south 

 and none of them are truly arctic species, although a single one, 

 Crangon vulgaris^ extends north to the Gulf of St. Lawrence and to 

 Europe. 



The following, in addition to list (1), are southern species occurring 

 north of Cape Cod Bay only accidentally or in exceptionally pro- 

 tected localities: 



Callinectes hastatus. i Palsemonetes vulgaris. {'!.) 



Panopeus Harrisii. 

 Libinia emarginata. 

 Eupagurus longicarpus. 



Heteromysis formosa. 

 Mysis Americana. 



Excluding the species in lists (1, 2), there are left eighteen northern 

 species which extend south of Cape Cod, Of these, 



Hyas coarctatus, l Pandalus Montagui, (3.) 



Eupagurus bernhardus, 

 E. pubescens, 

 Hippolyte pusiola, 



Thysanopoda inermis, 

 Eudorella deformis. 



are northern and European species which extend but a short distance 

 south of Cape Cod, where they are found usually only in cool waters 

 of exposed localities, or, in the case of Thysanopoda inermis, only 

 in winter. 



Of the eleven remaining species which occur both north and south 

 of Cape Cod, 



Cancer irroratus, 

 C. borealis, 

 Homarus Americanus, 



have about equally extensive ranges and are about equally common 

 both north and south of Cape Cod, and must be regarded as belong- 

 ing properly to both faunae. The others. 



Crangon vulgaris, (4.) 



Mysis stenolepis, 



Diastylis politus, 



D. sculptus, 



D. quadrispinosus, 



Diastylis abbreviatus, (5.) 



Eudorella hispida, 

 B. pusilla, 



are all Cumacea which may fall in the same category as the four pre- 

 ceding species, although it is probable that some or perhaps all of 

 them will be found to belong more exclusively to the northern fauna. 

 None of the species in the last two lists are known to extend far 

 north, nor, with the exception of Crangon vulgaris, to Europe 

 although they all belong to genera well represented in European seas. 

 Excluding, from the number of species recorded from both north 

 and south of Cape Cod Bay, the seven southern species (2) which 



