118 PLANARIA. 



Specimens were taken in Lochend, a small lake, during July and 

 August. 



Some individuals of the species extend two lines. 



It is not improbable that this will prove an intermediate species be- 

 the Planaria and some other genus. 



PLATE XVI. 



FIG. 26. Planaria falcata. 



27. Head enlarged, shewing the position of the crescent. 



28. Another specimen, shewing the intestinal organ. 



29. Another specimen. 



b. PLANARIA STAGNI. Plate XVI. Fig. 30. 



Length half a line ; breadth a sixth of the length. Body flattened, 

 nearly linear ; extremities obtuse. No eyes visible. Colour white : 

 motion swift. A specimen taken in August in Blackball Pond. 



PLATE XVI. 



FIG. 30. Planaria stagni. 



c. PLANARIA FO:CITNDA. Plate XVI. Fig. 31. 



Length half a line ; body flattened, nearly linear, but the middle 

 broader. No eyes discernible. Colour white in the general aspect. 

 Twelve or fourteen, almost spherical ova, occupied nearly the whole body 

 of a specimen taken in Lochend during June. 



PLATE XVI. 



FIG. 31. Planaria fwcunda, enlarged. 



e. PLANARIA FLUSTER Sea Mat Planaria. Plate XVI. Fig. 32. 



Length nearly two lines ; breadth a sixth or seventh of the length. 

 Body convex above, flattened below. A dark spot on the neck. Colour 

 white. Motion very swift. Apparently sustained by an invisible thread 



