THE NAUTILUS. 31 



deal like jmtris, but sinallisli and spire longer; whorls con- 

 vex. It seems to be a good species. I have also seen it from 

 Alexandria, La., in the Binney and Bland Collection. 



(17.) S. stretchiana Bland. I have seen this from San Francisco, 

 Cal. (G. W. Michael), sent bj' Mr. Singley. It seems to be 

 a small species of the putrls group, allied to S. parvula 

 Drouet, of Europe. Reddish-horn, not very shiny, striate, 

 spire rather large. In the Binney and Bland Collection, 

 one from Washoe Co., Nevada, looks rather like avara, at 

 least in color; but another from Oregon is brown and 

 resembles the putris group. There is a form major Ancey, 

 ms. (sine descr.), nearly twice the size of the type, recorded 

 by Yarrow, from Pagosa, Colo. 



THE SHELL BEARING MOLLUSCA OF MICHIGAN. 



BY BRYANT AVALKER, DETROIT, MICH. 



Carychium exigwim Say. Common everywhere. 



C. exile H. C. Lea. Although not as common as C. exiginim, 

 the localities where this form has been found indicate that it will be 

 found generally distributed over the state. 



Lhnncea stagnalis L, PI. I, fig. 6. 



Occurs all over the State, often in great abundance. An extreme 

 form, in which the body whorl is obtusely angulated, and the aper- 

 ture much enlarged, from Houghton Lake, Roscommon County, is 

 shown in fig. 6. 



L. stagnalis jugularis Say. PI. I, figs. 1, 2, 3. 



I think this form is entitled to varietal rank. It is not as com- 

 mon as the typical form and seems to occur usually by itself. Fig- 

 ures 1, 2 and 3 from Black Lake, Presque Isle County, may be 

 referred here ; but the expansion of the lip, especially of fig. 1, is not 

 typical, and is probably due to some peculiar local conditions. All 

 the specimens from this locality are a pure translucent white. The 

 Physa fragilis of IVIighels is probably a similar case in another 

 genus. 



L. stagnalis sanctcemarice. PI. I, figs. 4 and 5. 



