APPENDIX. 155 



15. ' a, Sam, Lake Yaseux, St. Mary's 



ry large. 



hi. A: w: \:< >\ : \ B 5 vreolatus? Swain- 



The spe -uncus of this shell are too old and imper- 

 to be safely determined. 



I MP. 



it. Barnes, Painted Rocky Upper Mississippi. 



I r Mississippi, Prairie du Chien, to 

 I. " pin. 



li». I mo vbi • uL .. St. Croix River of the Upper 



•J". 1 wo PLir.vTrs, L* Surur, Say. Prairie du Chien, and River 



X. 



mens of I . PLICATUS sent from this locality by Mr. School- 

 craft have the nam' beautifully tinged with violet, near the posterior bor- 

 der of the shell, and arc also much more ventricose than those found in 

 ■ten localities, as Pittsburgh, for example; at the same time, I 

 before them t<> be of the same species. Similar variations are observed 

 m c -; the specimens from the south and west generally ex- 



hibiting a gn atrr development. 



21. (Jmo rmiCK n -. I."i. Prom the same locahty as the last, and 

 like it unusually \< 



. /- . I pper Mississippi, between Prairie du Chien 

 and ; in. 



. Barnes, St Croix River, Upper Mississippi. 

 . Tjmarck, l. pbjblohous, Barnes* 1 pper Mis- 



• hi Chien to Lake Pepin, and the River St. Croix. 

 Th< i by Mr. Schoolcraft, vary much in the color of 



baveh entirely white, others, rose purple, and oth- 

 y fine dark salmon color. This species inhabits the 

 St 1. Montreal. 



. and U. ixflatus, Barnes, Upper 

 rj Prairie du Chien and Lake Pepin. Large, ponde- 

 ad the epidermis finely rayed. 



s, /."/. I". rrRPUREus, Say. Lake Vaseux, 

 L I is an expansion of the River St. Mary, 



•he- upper lakes. This shell does not appear to exist in 

 Sowing into th' pi. 



• x ppi, Prairie du Chien. 



• Lake Vaten*. The specimen is old 



I . KAniATrs ..f our eoncholo- 



Champlain and also inhabits the St. 



1 • . Am. ( 'o n . I . fHf- 



: : and Shell Lake. 



