II .< 



BYTfONYMM 



1 T . ur »nti 1 1 «, Paf. Knn. jj^n. o'o* Sc. Ph\s.. vol. v. p. 41. 

 Poaboa'i tnin«ila'ion. p. 42. *«y- Amer. Coach., pi. 53. 



I . »i i.im «, liarntt. Sil'iman's Journ., vol. vi. p. 136. //»/- 



dreth. Silliman's J<>urn., vol. xiv. p. J-'J. 

 ( . Lacbtmmvs, Jsa. Trans. Anier. IMnlo>. Soc., vol. in. p. 14. 



pi. M. 



I larnsunrt, I.ta. lb. vol. iv. p. M, pi. v. 



ORSERVATlUNS. 



The description, uitli a few alteration?, is copied 

 fr«>rii thai of Barnes. Tin* species, Mr. Say remarks, 

 "approximates bj its \arieties, some <»1 the varieties 

 of l\ buUatus, Raf." It hai likewise affinity with V, 

 prisinus, I . Morloni, and I . apiculatus. Barnes com- 

 pares it with U. verrucosus, Raf., to which, Mr. Say 

 observes, it has but a remote affinity. 



Inhabits the Ohio and its tributaries, and some of 

 the rivers of Louisiana. 



I am indebted to the hl>crahty of the Academy of 

 Natural Sciences for the use of the plate which was 

 engraved for Say's American Concbology. 



INK) CYPHIUS. 



Platr LXIII. 



DESCRIPTION 



Shell ovate, ventricose anteriorly; substance of the 

 shell very thick anteriorly; valves with a wide do- 



