10 PLANARIADiE. 



3. P. felina, linear-oblong, minutely tricuspidate in front, of a uni- 

 form dark brown, paler underneath. Length 8'" ; breadth 1^'". 



Planaria felina, Dalyell on Flanarice, 42. f. 8 (1814). 



Planaria cormita, Johnson in Phil. Trans. 1822, 437. pi- 49. f. 1, 7, 



.9, 10, 13 & 16 ; and lib. ibid. 1825, 249 & 251. pi. UJ. f. 1, 2, 4-8. 

 Planaria vigancnsis, Dugh in Ann. des Sc. nat. xxi. 84, 91. pi, 2. f. 23 



(1830). 

 Polycelis nigra, var. vigancnsis. Dies. Syst. Helm. i. 192. 



Hab. Stagnant waters in which aquatic vegetables abound : rarely in 

 springs. 



Obs. Longer in proportion to its length than the preceding, and 

 more decidedly auricled in front : in shape it is rather elliptical than 

 oblong, tapering backwards from about the middle ; whereas in niffra 

 and brunnea, the sides, a little sinuated behind the head, continue 

 parallel until near the tail, which is narrowed and obtuse. 



5. PLANARIA. 



Planaria, Miill. Zool. Dan. Prod, xxviii. (1776). Blainville in Diet, 

 des Sc. nat. Ivii. 578. Oersted, Entw. Plattw. 52. Diesing, Syst. 

 Helm. i. 202. 



Char. Body narrow-oblong, fiattish, the front truncate, more or 

 less auricled on each side, the tail rounded : eyes two, placed on the 

 anterior part of the back, parallel. 



* Freshwater. 

 1 . P. lactea, white, roseate or brownish, with a milk-white mesial 

 spot. Length 6-9'" ; breadth 1^-2'". 



Fasciola lactea, Miill. Verm. i. ii. 61. 



Planaria lactea. Mull. Zool. Dan. Prod. no. 2687 ; Zool. Dan. iii. 47. 

 tab. 109. f 1, 2. Turt. Gmel. iv. 64. Stew. Elem. ii. 355. Bosc, 

 Vers, i. 303. Rees' Cyclop, xxvii. verb. Planaria. Blainv. Diet, 

 des Sc. nat. Ivii. 578. Lam. An. s. Vert. iii. 179; 2de edit. iii. 607. 

 Johnson in Phil. Trans. 1822, 438. pi. 49. f. 4, 5, 1 1 , 15 & 17. Baer 

 in Nov. Act. Curios, xiii. 705. tab. 33. f. 1,2, 8-11 (1826). Duges 

 in Ann. des Sc. nat. xv. 144. pi. 4. f. 12 ; Edin. Journ. Nat. and 

 Geogr. Sc. iii. 242 & 243. W. Thompson in Ann. ^ Mag. Nat. Hist. 

 xviii. 388. Dalyell, Pow. Creat. ii. 107. pi. 16. f. 5-9, and pi. 15. 

 f. 4-6. Dies. Syst. Helm. i. 203. 



Hirudo alba, Kirby in Linn. Trans, ii. 31 6. 



Planaria alba, Turt. Brit. Faun. 129. 



Dendroeoelum laeteum. Oersted, Entw. Plattw. 52. 



Hab. In cold springs and lakes, not common : gregarious. 



Obs. The front is truncate and even, scarcely auricled. There 

 are occasionally four eyes, when the anterior pair is very minute. 

 Readily distinguished by its white colour. Dark individuals owe 

 their taint to the substance they have been recently feeding upon ; 

 and resume their natural fairness after a short abstinence. 



