MARINE ISOPODA OF NEW ENGLAND, ETC. 431 



terraneaJjeachj taken from a " small fish in rock-pools at Herm in 1865." 

 This genus has not been found on our coast. 



Of the three genera and three species of Anthuridce in our list two 

 genera are also found in Great Britain, and it is possible that one species 

 may yet prove identical. The Gnathiidw are more diificult of comi>ari- 

 son on account of the confusion that has existed in the sexes, and the 

 larval forms. Our specimens seem to be all referable to a single species, 

 doubtless congeneric Avith the British species, the number of which may, 

 Ijerhaps, by a liberal estimate, be placed at three. 



In the Tanaidce, the genera are the same as in Great Britain, and two 

 of our species, Tanais vlttatus LillJ. and LeptochcUa algicola Harger, are 

 found on both coasts. There remain a second species of Tanais on the 

 British coast, and two species of LeptocJielia {Paratanais of Bate and 

 Westwood) against four species of LeptocJielia on our coast, as the remain- 

 ing representatives of this family. The genus Apseudes should probably 

 be taken to represent a family not yet found on our coast. 



We have, therefore, the following list of marine familes, with the 

 genera in each, that are identical on our coast and that of Great Britain. 

 The species have been already indicated in a preceding list: 



Bopyridse : Gyge, Phryxus, Bopyrus. Two species. 



Asellidse : Jsera, Janira, Munna. One species. 



Idoteidse : Idotea. One species. 



Arcturidse: Astacilla. 



Sphaeromidse : Sphseroma. 



Limnoriidse: Limnoria. One species. 



Cirolanidse: Cirolana. 



^gidte: ^ga. One species. 



Cymothoidae. 



Anthuridse: Anthura, Paranthura. ' 



Gnathiidse: Gnathia. 



Tanaidse: Tanais, Leptochelia. Two species. 



Further details of geographical and also of bathy metrical distribution 

 are presented in the table on pages 139 to 141, in which the first column 

 shows the least depth in fathoms at which each species has been collected 

 on our coast ; the second the greatest depth ; and the following eighteen 

 columns are for different localities, w hich may be further explained as 

 follows: The Carolinas include Charleston, S. C, Fort Macon, N. C, and 

 Norfolk, Va.; New Jersey includes Great Egg Harbor and Atlantic 

 City, N. J., and Fire Island Beach, on the south shore of Long Island ; 

 Long Island Sound includes Savin Rock, New Haven, Stony Creek, or 

 Thimble Islands, Saybrook, New London, and Norwalk, Conn.; Block 

 Island includes Watch Hill, Block Island Sound, and the deeper water 

 off the island ; Vineyard Souud includes also Buzzard's Bay, Nantucket 

 Sound, and off Nantucket Island; Cape Cod Bay includes Province- 

 town and Barnstable; Massachusetts Bay includes Salem, Nahant, Glou- 



