MARINE ISOPODA OF NEW ENGLAND, ETC. 431 



terraneaLea<i]i, 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 antl three species of AnthuHdce in our list two 

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

 may yet prove identical. The Gnathiidcv are more difficult of compari- 

 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 with the British species, the number of which may, 

 perhaps, by a liberal estimate, be i^laced at three. 



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

 of our species, Tanais vittatus Lillj. and LcptocJielia algicola Harger, are 

 found on both- coasts. There remain a second species of Tana/.s^ on the 

 British coast, and two species of LeptocheUa (Parafanais of Bate and 

 West wood) against four species of LeptocheUa 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: 



Bopyridffi: Gyge, Phryxus, Bopyrus. Two species. 



Asellidge: Jcera, Jauira, Munna. One species. 



IdoteidsB : Idotea. One species. 



ArcturidiB : Astacilla. 



Sphseromidte: iSphseroma. 



Limnoriidoe : Limnoria. One species. 



Cirolanidse: Cirolana. 



JEgidse: ^ga. One species. 



Cymothoidte. 



Anthuridse: Anthura, Paranthura. 



Gnathiidoe: Gnathia. 



Tanaidoe: Tanais, LeptocheUa. Two species. 



Furtlier 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 dilferent localities, which may be further explained as 

 follows: The Carolinas include Charleston, S. 0., Fort Macon, K C., and 

 Norfolk, Ya.; iSTew 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, Kew Haven, Stony Creek, or 

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

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

 off the island -, Vineyard Sound 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- 



