"omS,Ma;°ri«'^'] ^orjal Microscopwol Sociehj. 235 



sucker to the snail, and thus its mouth is left perfectly free to secure 

 its food. The mouth, armed with more than a pair of mandables, 

 might he used as a formidable weapon of offence. It occurs to me 

 that if these epiphytes were solely nourished by the snail, a colony of 

 them must prove a formidable army of blood-suckers. 



Unfortunately my further investigations were suddenly inter- 

 rupted by an accident which broke the aquarium and killed the 

 Lymnaeus, and I have not since been able to renew them. But I 

 may add, in conclusion, that I was at first inclined to regard my spe- 

 cimen as new. Upon a more careful comparison I am disposed to 

 believe that it is no other than Cer c aria fur caia of Nitzsch, although 

 from the imperfect character of his drawings I might have been 

 betrayed into the error of supposing that I had indubitably dis- 

 covered a new species. 



