THE NAUTILWS. 63 



An apparent peculiarity of Howe Lake shells is the very irregular 

 growth. Of the eight 1906 specimens before me only one (fig. 4) is 

 entirely regular in the coiling of the whorls. Of the others the 

 shell represented by figs. 9-11 is least distorted and figure 8 is most 

 so. That this was also a peculiarity of the original lot is shown by 

 figure 3. 



P. inaltivolvis is apparently a scarce shell in Howe Lake at the pre- 

 sent time. Two visits there in July, 1907, each involving a careful 

 search of the entire north shore, only yielded three specimens. It 

 seems probable that the species lives in comparatively deep water 

 during the summer and only comes in towards shore, if at all, for 

 spawning purposes. Such seems to be the habit of the Lymnaeidae 

 in Pine Lake, Marquette County, which I have been familiar with 

 for more than ten years, and a similar habit has been noticed by 

 Kirkland in Lymncea mighehi in Crystal Lake, Benzie Co., Mich. 

 (Nautilus, XIV, p. 8.) 



The dimensions of the specimens figured are as follows : 



Major diam. Minor diam. Axis. 



Figs. 1-3 14.00 mm. 11.50 mm. 6.00 mm. 



Fig. 4 16.25 mm. 13.00 mm. 9.00 mm. 



Figs. 5-7 16.25 mm. 13.00 mm. 7.00 mm. 



Fig. 8 18.25 mm. 15.25 mm. 8.25 mm. 



Figs. 9-11 18.00 mm. 15.00 mm. 9.00 mm. 



The actual occurrence of this species in Michigan having thus 

 been definitely determined, there still remains the question as to the 

 locality where the type' specimens were obtained. Unfortunately, 

 Capt. Stannard failed to give any definite information on this point, 

 and after the lapse of sixty years, there is no hope of getting any 

 exact information. But it is a fair subject for speculation. One 

 fact is clear, that although but a very small portion of the Upper 

 Peninsula has as yet been explored conchologically, the work that 

 has been don<; there has, with this one exception, failed to discorer 

 it. The species was described in 1847, and the specimens were 

 probably collected within a year or two previous to that time. It is 

 to be borne in mind that at that time the Upper Peninsula was an 

 unbroken and practically an unknown wilderness. The rapid de- 

 velopment incident to the growth of the copper, iron and lumber 

 industries had not begun. Marquette was not settled until 1846, 



