THE FAMILY NAIADES. 



53 



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 O 

 Q 

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Ph 



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o 



OBOVATE. 



lato-marginata.* Lea. 

 An. trapezius?! Spix. 

 An. rotundus? »9(0z>. 



porcifer.ij; Gray. 



trapezialis. Lam. Blain. 

 An. exotica. § Lam. 

 An. giganteus. /S^p/or. 

 An. pencillatus? Gray. 

 An. Susan nae. Gray. 

 An. anserinus. »S^z>. 



Georginae. Gray. 



Parishii.|| Gray. 



Blainvilliana. Lea. 



crassa. Swain. 



Crouch. 



WIDE. 



elongata. Sivain. 



* The Patagcmica and lato-marginata, when they are better observed, 

 may prove to be the same. 



■j- Spix's figure so closely resembles the lato-marginuta, that I scarcely feel 

 a doubt as to their being the same. He does not, however, notice the broad 

 margin which is so characteristic of this species. 



\ Never having seen this species I place it here on Mr. Gray's authority. 



§ So far as I have been enabled to examine specimens of this and trape- 

 zialis, I am disposed to think they are not distinct species. 



n On the authority of Mr. Gray. 



