12 PLANARIAD.E. 



** Marine. 



5. P. ulvae, of an olive mottled colour, with a pale abbreviated 

 mesial line ; front truncate, distinctly auricled ; the tail truncate or 

 more commonly emarginate. Length 5'"; breadth 1^'". 



Planaria ulvse. Oersted, Entw. Plattw. 53. f. 5. Dies. Syst. Helm. 

 i. 205. 



Hab. At the roots of the Laminarise between tide-marks. 

 (a) Berwick Bay, Dr. Johnston. 



6. P. aflSnis, linear-oblong, rounded and slightly enlarged at the 

 front, of a wood-brown colour, with an oblong white line on the 

 posterior half; eyes a little behind the front, each in the centre of a 

 white spot on the sides of the mesial line. Length 3'" ; breadth |^"'. 



Planaria ajfinis. Oersted, Entw. Plattw. 54 (1844). Dies. Syst. Helm. 



i. 206. 

 Planaria hebes, Dalyell, Paw. Creat. ii. 107. pi. 16. f. 3, 4. 



Hab. Amongst algae between tide-marks. 



7. P.? alba, Unear-oblong, obtuse at both extremities, the anterior 

 narrowest ; pure white ; eyes black, placed backwards and wide 

 apart. Length 3'" ; breadth i'". 



Planaria alba, Dalyell, Paw. Creat. ii. pi. 16. f. 21, 22. 

 Hab. Shores of Scotland, Dalyell. 



Obs. Dalyell remarks that the intestinal canal is not pinnate. 



8. P. ? variegata, linear-oblong, a little bulged in the middle, trun- 

 cate in front, acuminated behind, fasciated across the back with 

 black and yellow belts ; eyes two, black, considerably apart. Length 

 H'"; breadth f". 



Planaria variegata, Dalyell, Paw. Creat. ii. 115. pi. 16. f. 20. 



Hab. Coast of Scotland, very rare, Daly ell. 



Obs. This may prove to be a species of the molluscous genus 

 Limapontia. "This is a beautiful animal, plump and heavy, the 

 belly flattened. In crawling up the side of a vessel, it is liable to 

 drop to the bottom, but its descent seems to be retarded by an invi- 

 sible thread." — Dalyell. 



The following are doubtful members of this family : — 



Planaria gracilis, body rather linear, acute behind, flattened, white ; 

 eyes two, black, placed forwards. Length i'". 



Planaria gracilis, Dalyell, Poio. Creat. ii. 116. pi. 16. f. 23. 

 Hab. Lochcnd, Dalyell. 



