BRITISH MARINE TURBWLLARIA. 513 



Cycloporus papillosus, may be distinguished by the 

 absence of a median gut-branch over the white pharyngeal 

 region, by the presence of only 5 — 6 pairs of secondary 

 branches (Cycloporus possesses 8—9) to the intestine, and by 

 their non-anastomosing character. 



I have included Planaria ellipsis of Dalyell and others 

 under this species, since his figures agree exactly in the points 

 just mentioned. 



III. Summary. 



1. British marine Turbellaria, as at present known, include 

 about fifty-seven species of Rhabdocoelida, twelve of Polycladida, 

 and two 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. 



POLYCLADIDA : 



Cycloporus papillosus, Lang. 

 AccELA : 



Proporus venenosus (O. Sch.). 

 Monoporus rubropunctatus (O. Sch.). 

 Aphanostoma elegans, Jensen. 

 Rhabdocoela : 



Promesostoma ovoideum (O. Sch.). 

 solea (O. Sch.). 



„ agile (Lev.). 



„ lenticulatum (O. Sch.). 



Byrsophlebs Graffi, Jensen. 

 Mesostoma neapolitanum, v. Graff. 

 Hyporhynchus armatus (Jensen). 

 ? „ penicillatus, (O. Sch.). 



Provortex rubrobacillus, n. sp. 



