150 Dr. W. C. M'Intosh on the 



common Leptoplana jlexilis may be kept for months in con- 

 finement, though it is perhaps less hardy in this respect than 

 the Nemerteans. Even though it perishes, however, it fre- 

 quently deposits pale brownish masses of agglutinated ova on 

 the side of the vessel ; and the development of these can easily 

 be followed. 



Subclass TURBELLARIA. 



A. APROCTA, Max Schultze. 



Order I. Dendkoccela. 



Fam. LeptoplanicUe. 



Genus Leptoplana, Ehrenberg. 



Leptoplana subauriculata, Johnston, Catologue of the Non- 

 parasitical Worms, Brit. Mus. p. 6. 



Common between tide-marks. 



Leptoplana jiexilis, Dalyell ; Johnst. Cat. p. 6. 

 Abundant under stones between tide-marks. 



Leptoplana atomata, Muller ; Johnst. Cat. p. 6. 

 Common in the same localities. 



Leptoplana ellipsis, Dalyell ; Johnst. Cat. p. 7. 

 Not uncommon between tide-marks. 



Order II. Rhabdoccela. 



Fam. 1. Proboscidea, J. V. Carus. 



Genus Prostomum, (Erst. 



Prostomum lineare, G^rst. ; Johnst. Cat. p. 62. 



Occasionally found on stones brought from the rocks near 

 low water. 



A curious form, having a pointed snout with a globular 

 process posteriorly, and a dull pinkish alimentary canal, was 

 procured from the fishing-boats ; but unfortunately I possess 

 only the drawing, upon which, however, every reliance can be 

 placed. 



