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. 
Prats XVI. 
Fic. 26. Planaria falcata. 
27. Head enlarged, shewing the position of the crescent. 
28. Another specimen, shewing the intestinal organ. 
29. Another specimen. 
6.—PLANARIA staGNni.—Plate XVI. Fig. 50. 
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 Blackhall Pond. 
Prats XVI. 
Fic. 30. Planaria stagni. 
c.—PLANARIA FHCUNDA.—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. 
Prats XVI. 
Fic. 31. Planaria fecunda, enlarged. 
e.-—PLanaria FLUSTRA—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 
