34 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



former. Orchestia palustris prefers mud, and as it is able to 

 survive exposure to brackish or nearly fresh water, it is often 

 found in salt marshes and may find its way to some distance 

 from the shore. Delia Valle mentions O. gammarellus, in which 

 species he includes O. palustris , as occurring several kilometers 

 from the sea shore at Naples. Allorchestes littoralis also occurs 

 high upon the beach, according to Holmes. With these few 

 exceptions, however, the Amphipoda are thoroughly aquatic. 



In New England there are only three species which occur in 

 fresh water: Crangonyx tennis, which was found by Smith in 

 wells at Middletown, Dikerogammarus fasciatus, and Hyalella 

 knickerbockeri. 



Dredging operations have been so incomplete in the waters 

 of Long Island Sound within the bounds of the State that it is 

 impossible to generalize from these data alone. The extensive 

 observations made in the nearby waters of Vineyard Sound and 

 Buzzards Bay by Verrill and Smith and also by Sumner, Osburn, 

 and Cole may, it would seem, be extended in the most general 

 way to the shores and waters of Long Island Sound. 



The following species are known to occur at the surface and to 

 be taken in towing: 



Allorchestes littoralis Elasmopus levis 



Ampvlisca macrocephala Gammarus annulatus 



Amphithoe longimana G. locusta 



A. rubricata Grubia compta 



Batea secunda Hyperia galba 



Byblis serrata Leptocheirus pinguis 



Calliopius l&viusculus Microdeutopus gryllotalpa 



Carinogammarus mucronatus Paraphoxus spinosus 



Corophium cylindricum Pontogeneia inermis 



Dexamine thea 



The following species are found most commonly in eel-grass 

 and mud : 



Amphithoe longimana Grubia compta 



A. rubricata Leptocheirus pinguis 



Caprella geometrica Lysianopsis alba 



Carinogammarus mucronatus Microdeutopus gryllotalpa 

 Elasmopus levis 



