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MISCKLLANKA. 50I 



He considers them to be auxiliaries to locomotion, serving to 

 fix the body whilst the anterior part is extended. The 

 Cercaria he describes, found in Paludina impttra and Melania 

 fnbeirulafa, agrees very well with my specimens. He con- 

 siders it however to be the larval form of Monostomum 

 vei'i'iicostun, Froel. I had not seen this work when I wrote 

 my paper. His Cercaria pletirolophocerca seems closely allied 

 to C. lophocei'ca, and my Cercaria 7ibiquita is very lil<;e his 

 C. exigiea, C. cellidosa, and C. pnsiila, though probably not 

 identical with any of them ; but in all these there is a con- 

 spicuous ventral sucker, which makes it all the more probable 

 that one will be found in my specimens. — Marie V. Leboicr. 



