250 P. W. GAMBLE, B.SC. 



Tricladida, making a total of seventy-one species. The numbers 

 represent the examination of a limited extent of our coast (Millport, 

 St. Andrews, Skye, the Isle of Man, Plymouth, and Channel Islands) 

 during about three months of the year (July to September). 



2. The following twenty-eight species are added to the British 

 fauna in the present paper. 



POLTCLADIDA : 



Cycloporus papillosus, Lang. 



Accela : 



Proporus venenosus (0. Sch.). 

 Monoporus rubropunctatus (0. Sch.). 

 Aphanostoma elegans, Jensen. 



RHABD0C03LA : 



Promesostoma ovoideum (0. Sch.). 



,, solea (0. Sch.). 



„ agile (Lev,). 



„ lenticulatum (0. Sch.). 



Byrsophlebs Graffi, Jensen. 

 Mesostoma neapolitanum, v. Graff. 

 Hyporhynchus armatus (Jensen). 

 1 „ penicillatus (0. Sch.). 



Provortex rubrobacillus, n. sp. 



All(Eoco3la : 



Plagiostoma dioicum, MetschnfF. 



„ sulphureum, v. Graff. 



„ Girardi (0. Sch.). 



„ pseudomaculatum, n. sp. 



„ sagitta (Vlj.). 



,, elongatum, n. sp. 



,, caxidatum, Lev. 



„ (?) siphonophorum (0. Sch.). 

 Vorticeros luteum, v. Graff. 

 Cylindrostoma inerme, Halley. 

 ,, elongatum, Lev. 



Monoophorwn striatum (v. Graff). 



