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



common Lcptajjlana flexiUs may be kept for months in con- 

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

 the Nemcrteans. 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. Dendk0C(ELA. 



Fam. LeptoplanidsB. 



Genus Leptoplana, Ehrenberg. 



Leptoplana subauriculaia^ Johnston, Catologue of the Non- 

 parasitical WoiTus, Brit. Mus. p. 6. 

 Common between tide-marks. 



Leptoj)lana Jiexilis^ Dalyell ; Johnst. Cat. p. 6. 

 Abundant under stones between tide-marks. 



Lepto-plana atomata^ Miiller ; Johnst. Cat. p. 6. 

 Common in the same localities. 



Leptoplana ellijisis^ Dalyell; Johnst. Cat. p. 7. 

 Not uncommon betu-een tide-marks. 



Order II. Rhabdoccela. 



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



Genus Prostomum, (Erst. 



Prostomum lineare, QDrst. ; 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 pinkisli alimentary canal, was 



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

 placed. 



