12 PLANARIADiE. 



** Marine. 



5. P. iQvsB, 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 ly'". 



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. afl&nis, 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 f ". 



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



i. 206. 

 Planaria hebes, Dalyell, Pow. Great, u. 107. pi. 16. f. 3, 4. 



Hab. Amongst algse between tide-marks. 



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

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

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



Planaria alba, Daly ell, Pow. Great, ii. pi. 16. f. 21, 22. 

 Hab. Shores of Scotland, Daly ell. 



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



8. P.? variegata, Hnear-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 

 If" ; breadth f '". 



Planaria variegata, Dalyell, Pow. Great, ii. 115. pi. 16. f. 20. 

 Hab. Coast of Scotland, very rare, Dalyell. 



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 y. 



Planaria gracilis, Dalyell, Pow. Great, ii. 116. pi. 16. f. 23. 

 Hab. Lochend, Dalyell. 



