THE NAUTILUS. 19 



Figs. 5, G and 7. L. petoskeyensis Walker (types), Petoskey, 

 Mich. 



Figs. 8 and 11. L. pilsbryana Walker (types), Isle Royal, MicL. 



1M.ATK II. 



Figures 1 to 4 inclusive are enlarged on the same scale. Figures 

 7 and 8 are also equally enlarged, but on a smaller scale. Figures 

 5, 6 and 9 to 12 inclusive are natural size. 



Fig. 1. L. timbilicata C. B. Ads. (ex auct.), New Bedford, R. I. 



Fig. 2. L. umbilicata, Rhode Island. 



Fig. 3. L. cubensis Pfr., Enterprise, Fla. 



Fig. 4. L. cyclostoma Walker (types), Indian Creek, Kent County, 

 Mich. 



Figs. 5 and 6. L. stagnalis perampla Walker (types), Houghton 

 Lake, Mich. 



Fig. 7. L. desidiosa peninsulas Walker (types), Union R., Onton- 

 agon, County, Mich. 



Fig. 8. L. desidiosa Say, Oakland County, Mich. 



Figs. 9 and 10. L. davisi Walker (types), Fish Point, Tuscola 

 County, Mich. 



Fig. 11. L. bakeri Walker (young) Pine Lake, Charlevoix, Mich. 



Fig. 12. L. bakeri (type), Pine Lake, Charlevoix, Mich. 



ADDITIONAL SHELLS FOUND IN AROOSTOOK COUNTY, MAINE. 



BY OLAF O. NYLANDER. 



Circinaria concava Say, one small living shell of this species found 

 at Sherman, in 1904. 



Physa sayii, Tappan, very fine, large specimens found in Calleu's 

 mill pound, Caribou stream, Caribou, Maine, at Salmon brook, Lake 

 Perham and in the dead water on Salmon brook in Woodland. 



Lymnsea palustris Mull., a large colony of this species was found 

 in a small brook on G. C. Hall's farm 3 miles south of Caribou 

 village. 



Planorbis bicarinatus var. The carinations on this are extremely 

 developed; Portage Lake, Square Lake and Cross Lake all on Fish 

 River. 



Volvata sincera var. nylanderi Dall., Portage Lake, Square Lake 

 and Cross Lake, dredged at various depths to 25 feet. 



