Vol. XV. June, igo8. No. i 



BIOLOGICAL BULLETIN 



ON THE NORTH AMERICAN MARINE TRICLADS. 



DR. J. WILHELMI. 



During the last fifty years ten marine species of triclads were 

 found on the east coast of North America : 

 Procerodes xvheatlandi Girard (according to Verrill = Procerodes 



nlvcs (Oe.), according to Curtis = Gunda segmcntata Lang). 

 Procerodes freqnens Leidy (according to Verrill = Procerodes 



zv/ieallaiidi Gir.). 

 Fovia (^Vortex) warreni (Gir.). 

 Fovia [Planaria) grisea (Verrill). 

 Fovia affinis (Oe.) (var. tvarreid and var. grisea). 

 Fovia [Planaria) littoralis (Verrill). 

 Bdelloiira ( Vortex) Candida (Gir.) (= Bdelloiira parasitica Leidy = 



Planaria liniidi v. Graff). 

 Bdellonra propinqua Wheeler. 

 Bdelloiira rustic a Leidy. 

 Syncoelidiuni pellucidnm Wheeler. 



The identifications for the most part of these are quite doubtful, 

 because of the incomplete description ; also the identifications of 

 these species with European species, given by some authors, are 

 untenable. I studied these North American species in the most 

 important localities and in the following paper I shall give a short 

 notice of my results. I am not concerned with the Bdellourida; 

 (genera Bdelloiira and Syncoelidiuni), living on Limiilus, because 

 these have already been well described by Wheeler.^ Bdelloiira 

 rnstica, a free-living form, described by Leidy " cannot be identi- 



' Wheeler, W. M., " Syncoelidium pelluciduvi, a New Marine Triclad," /<?«;«. 

 Morph., Boston, 1894, pp. 167-194, PI. 8. 



2 Leidy, T., " Helminthological Contributions," No. 3, Proc. Acad. Nat. Sc, 

 Vol. v., Philadelphia, 1850/51, pp. 242, 243, 289. 



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