NORTH AMERICAN MARINE TRICLADS. 5 



(from the Bay of Naples, the Mediterranean and Black Sea), in 

 Procerodes uivcB (from the Baltic Sea) and also in the free-living 

 North American marine triclads. They live principally in the 

 cavity and the ramifications of the gut without damaging the 

 host. The transparent spots called by Girard the first traces of 

 the eyes, correspond to the organs of attachment and the aliment- 

 ary tube answers to the nucleus of the Hoplitophtya uncinata. 



With a detailed study of these Prof. M. M. Metcalf is occu- 

 pied ; at present he has given some notices on its excretory 

 organs.^ 



I shall give in my monograph of the marine triclads an ana- 

 tomical and histological description of these free-living North 

 American marine triclads. 



I append the list of the places on the east coast of North 

 America, where these free-living triclads have been found, and 

 indication of the corresponding literature. 



Bay of Fundy, Procerodes ivheatlandi {idva) 1893 Verrill (12). 



Eastport, Me., P. {Fovid) zvarreni 1893 Girard (8). 



Grand Manan, N. Br., P. whcadandi 1854 Girard (6). 



Grand Manan, N. Br., P. {Fovid) war rcni 1893 Verrill (12). 



Casco Bay, Me., P. ivhcaUandi (freqnens,nlvcE) 1873 and 1893 

 Verrill (10) (12). 



Casco Bay, Me., P. {Fovid) ivarrcni 1873 Verrill 1893 (lo). 



Casco Bay, Me., P. {Fovid) ivarreni {griscd) 1893 Verrill (12). 



Cape Elizabeth, Me., P. {Fovid) warrcni {affinis) 1873 Verrill 



(10). 



Gloucester, Mass., P. wheatlandi {ulvce) 1893 Verrill (12). 



Manchester, Mass., P. wheatlandi 1 8 50 and 1 85 i Girard (2) (5). 



Beverly, Mass., P. {Fovia) icarreni 1893 Verrill (12). 



Chelsea Beach, Mass., P. {Fovia) ivarreni 1852 Girard (7). 



Boston Harbor, Mass., P. {Fovia) warreni 1850 Girard (4). 



Sandwich, Mass. (Cape Cod Bay), P. wheaUandi {Giinda) 

 segniontata 1900-OI Curtis (i). 



Woods Hole, Mass., P. {Fovia) warrcni 1873-74 Verrill (10). 



Woods Hole, Mass., P. ivheatlandi {idvce) 1893 Verrill (12). 



Vineyard Sound, P. wheatlandi {frequcns) 1855 Verrill (lo). 



•Metcalf, M. M., "The Excretory Organs of Opalina,'" Part II., Arch. f. 

 Pro/istenkuitde, lO. Bd., 1907. 



