112 



Figure 4. Ampullar i a Brownii, Nobis. 



Habitat, River Amazon. 



Remarks. — This ponderous Ampullaria was procured from Capt. Brown, of 

 Beverly, Massachusetts, who brought it from the above mentioned locahty. It 

 bears some resemblance to the Ampullaria crassa, Swains, tigured in Spix. tab. 

 V. f. 1. It may, however, be only a variety. 



Figure 5. Ampullaria Storeria, Nobis. 



Habitat, River Amazon. 



Remarks. — This is also one of the rarities brought home by Capt. Brown ; 

 and it is at his suggestion that I have named it after a very able and zealous 

 Naturalist, D. Humphreys Storer. M. D. of Boston. 



Figure 6, 7. Helix Planorbis, Nobis. 



Habitat, Island of Togobo, Gulf of Guyaquil. 



Remarks. — This beautiful shell was found by Capt. Sloat, U. S. N. It is 

 owing to tlie generosity of his Son, in whose cabinet it was, that I am enabled 

 to add this unique shell to my collection. It was the only one obtained, al- 

 though some time was spent in searching for another. The marking on the 

 upper surface is very similar to that of the Helix pellis-serpentis. 



Figure 8, 9. Paludina scalaris, Nobis. 



Habitat, Everglades of Florida. 



Reviarks.—T\\\s shell is white, semi-transparent, and very fragile ; the su- 

 tures of the whorls are very angular, and of the same character with the Ampul- 

 laria scalaris, D'Orbigny. It was presented to me by Count Castelneau, whose 

 researches in this country will, without doubt, add much interesting matter to 

 our knowledge of Natural History. 



Figure 10, 11. LymnjEA gracilis. Nobis. 



Habitat, Essex Co. New-York. 



Remarks.— \ am indebted to Professor Benedict, of Burlington, Vermont, for 

 two specimens of this very slender and fragile Lymnaea. 



