PLANOCERlDiE. 



* Eyes in two clusters. 



1 . L. subauriculata, body lanceolate, very thin, obtuse in front, of 

 a yellowisli-brown colour ; eyes numerous, in two clusters, with a 

 clear circular spot to each cluster, and a clear intervening space. 

 Length 6'" ; breadth 2'". 



Planaria subauriculata, Johnston in Loud. Mag. Nat. Hist. ix. 16. f. 2. 

 Leptoplana subauriculata, Dies. Syst. Helm. i. 195. 

 Planaria corniculata, Dalyell, Pow. Great, ii. lOl. pi. 14. f. 5. 



Hab. The shore between tide-marks. 



2. L. tremellaris, body ovate, sinuous on the margin, yellowish, 

 unspotted ; posterior eye-clusters on a pale spot, irregular, with a 

 line from each running parallel forwards to a minute ocular spot. 

 Length 8-11'" ; breadth 3-5'". 



Fasciola tremellaris, Miill. Verm. i. ii. 72. 



Planaria tremellaris, Miill. Zool. Dan. Prod. 223 ; Zool. Dan. i. 36. 



t. 32. f. 1,2; copied by Blainv. Diet, des Sc. nat., Vers, Atlas, f. 14. 



Turt. Gmel. iv. 67. Bosc, Vers, i. 309. Lain- An. s. Vert. iii. 180; 



2de edit. iii. 608. Duges in Ann. des Sc. nat. xv. 144. pi. 4. f. 14. 



Grube, Actin. 52. W. Thompson in Ann. &■ Mag. Nat. Hist. v. 



247. 

 Leptoplana tremellaris. Oersted, Entw. Plattw. 49. Dies. Syst. Helm. 



i. 198. 



Hab. In pools among the rocks between tide-marks, under stones, 

 (a) Rothesay, Miss Macdonell. 



** Eyes in four clusters. 



3. L. flexilis, body very thin, ovato-lanceolate, widest and semi- 

 circular in front, of a dull whitish or pale ash colour ; eye- clusters 

 defined by a clear space. Length 7'" ; breadth 3'". 



Planaria flexilis, Dalyell, Planar. 5. pi. 1. f. 1, 2. Johnston in Loud. 



Mag. Nat. Hist. ix. 17. W. Thompson in Ann. ^ Mag. Nat. Hist. 



ser. 2. iii. 354. Dalyell, Pow. Great, ii. 102. pi. 14. f. 17-26. 

 Polycelis fallax, Quatrefages in Ann. des Sc. nat. iv. 135. pi. 3. f. 10. 



(1845). 

 Leptoplana flexilis. Dies. Syst. Helm. i. 194. 



Hab. Between tide-marks, generally half-buried in mud : grega- 

 rious. 



4. L. atomata, ovate, obtuse, only a little narrower behind, speckled 

 brown ; eyes of the anterior clusters more scattered than of the pos- 

 terior, not seated on a lighter ground. Length 6'" ; breadth 3'". 



Planaria punctata, MiiU. Zool. Dan. Prod. 2706. 

 Planaria atomata, Miill. Zool. Dan. i. 37. tab. 32, f 3, 4. Turt. Gmel. 

 iv. 65. Bosc, Vers, i. 305. Fleming in Edin. Phil. Journ. viii. 297. 



