*S^. I. Smith — Crustaceans of the Atlantic Coast. 129 



Nectocrangon lar. 

 Hippolyte macilenta. 

 Pseudomma truncatum. 



Mysis oculata. (7.) 



Diastylis Rathki. 

 Leucon nasicoides. 



With the exception of the new species of Pseudomma, these are all 

 thoroughly arctic species, and show a slight increase in the arctic 

 character of the fauna of the Gulf of St. Lawrence over that of 

 northern New England. The Nectocrangon, the Hippolyte, and the 

 Diastylis were found also upon the Atlantic coast of Nova Scotia 

 and may, very likely, yet be found on the New England coast; while 

 the Leucon is already known from the Bay of Fundy and will doubt- 

 less yet be found in Casco and Massachusetts Bays. 



The fifteen species from Massachusetts and Casco Bays (6) not yet 

 recorded from the Gulf of St. Lawrence afford very little evidence in 

 regard to the relations of the fauna of the Gulf, for some of them 

 are known to be arctic and will undoubtedly be found in the Gulf, and 

 the distribution of most of the others is not sufficiently well ascer- 

 tained to be used as evidence. The absence of Eupagurus hernhardus 

 from the Gulf of St. Lawrence and Greenland, while it occurs on the 

 New England coast, in Europe, and in the North Pacific is, however, 

 an interesting fact which should not be overlooked. 



The shallow southwestern part of the Gulf of St. Lawrence, in- 

 cluding the region of Northumberland Straits, etc., as shown partic- 

 ularly by its Molluscan fauna, is much more southern in its character 

 than the rest of the Gulf; but too little is known of the stalk-eyed 

 crustaceans of this region to illustrate the fact, or to affect the state- 

 ments above made in regard to the fauna of the Gulf as a whole, for 

 the species which are recorded from this part of the Gulf only ai'e 

 all Cumacea of which the distribution is not sufficiently known to 

 make their occurrence here evidence in regard to the character of 

 the fauna. 



The deep-water species, or those which have not been recorded 

 from less than fifty fathoms on our coast, and which are not inserted 

 in lists (6, 7), are the following; those known from the Gulf of 

 Maine, from off the coast of Nova Scotia, etc., being indicated by an 

 M ; those from the Gulf of St. Lawrence, by an l : 



M G-eryon quinquedens. 



M li Chioncecetes opilio. 



M L Lithodes maia. 



M Parapagurus pilosimanus. 



L Munidopsis curvirostra. 



L Calocaris Macandreae. 



M Sabinea Sarsii. 



M Pasiphae tarda. (8.) 



M Pontophilns Norvegicus. 



M L Pseudomma roseum. 



M L Diastylis luciferus. 



M Leptostylis ampulaceus. 



M L Leucon nasicus. 



M L Eudorella emarginata. 



Trans. Conn. Acad., Vol. V. 17 May, 1879. 



