102 THE NAUTILUS. 



SHELLS OF WILLIAM'S CANON, COLORADO. 



BY F. A. SAMPSON, SEDALIA, MO. 



Fifteen years ago and again the past summer, I collected shells in 

 William's Canon at Manitou. On the first visit I asked a specimen 

 dealer if there were any land shells in the vicinity. He said there 

 ■were no living ones ; that he had hunted for specimens over the 

 mountains for years, but had never seen one, though there were 

 dead shells on the side of the mountain near by. I found the dead 

 shells, and also plenty of living Patula strigosa, in numbers more 

 abundant than at the latter visit. At that time I had not noticed 

 that Binney's Manual gave P. hemphilli as occurring at the same 

 place, else I would have made diligent search for it, though I do not 

 think it will be found there. It seems hardly probable that the 

 young of sir/^osa were mistaken for hevip hi Hi, though the shells of 

 four whorls are strongly carinated like hemj)hilli, while the mature 

 shells of five whorls do not show any carina. Cockerell in Nautilus* 

 Vol. Ill, p. 102, thinks the finding of hemphilli in the Ca,non needs 

 confirmation. 



Cockerell states that these shells are tyjiical rooperi. They are 

 certainly less elevated than Fig. 152 of Binney's Manual. They are 

 more like Fig. 153 except that they have the two bands shown in 

 Fig. 152, and are not carinated at the commencement of the body 

 whorl. Some of them have the heavy raised callus connecting the 

 extremiti-es of the peristome. 



On the rocky ledges by the road side in the Canon, I gathered a 

 number of small shells, all of them being dead. Had the day not 

 been excessively hot I might probably have found living ones. 



The following will show the species and the number found of 

 each : 



75. Patula strigosa cooperi W. G. B. 

 9. Zonites arboreus Say. 



28. Vallonia pulehella eostata Miiller. 



18. Ferussacia subyclindrica Linn. 

 5. Pupa undetermined. 

 1. Pupa hordeacea Gabb. 



