32 



THE NAUTILUS. 



This form from the Neebish Rapids of the St. Mary's River is 

 well characterized by its small size, and the flattening of the upper 

 part of the body whorl, which gives a mammilliform appearance 

 to the short, rapidly acuminating spire. The relative size of this 

 variety and the typical L. stagnalis is shown by comparing figs. 4 

 and 5 with fig. 6. 



L. ampla jNIigh. Houghton Lake, Roscommon County, is the 

 only locality I know of for this species. Specimens from there, 

 submitted to the late Dr. James Lewis, were so named by him. In 

 the form in which it is found in Michigan, it seems doubtfully dis- 

 tinct from L. emaj-ginata Say. 



L. decollata Migh. Cited by Currier and DeCamp, I have with 

 some hesitation referred specimens from Mullet Lake, Sheboygan 

 County, to this form. 



L. megasoma Say. Occurs in great abundance in the Higgins 

 River, Roscommon County ; also found at different localities in the 

 St. Mary's River. It seems to be confined to the northern part of 

 the state. 



L. reflexa Say. PI. I, fig. 8. 



Generally distributed over the state, and as usual in the genus, 

 exhibits a considerable degree of variability. In some forms it is 

 difficult to distinguish from L. palusiris Mull. L. umbrosa Say is 

 cited by De Camp as distinct. Fig. 8 is a specimen with a remark- 

 ably expanded lij), from the River Rouge, Wayne County. 



L. reflexa zebra Tryon. Occurs frequently, associated with the 

 type, and is easily connected with it in any considerable number of 

 specimens. 



L. reflexa exilis Lea. The specimens on which the citation of 

 this form in the catalogue of 1879 was based, are referred to the 

 type by Mr. Pilsbry. They differ sufficiently from the large form 

 usually found, as figured by Haldeman (Monograjjh pi. 8), -although 

 the whorls are not as flattened as the typical exilishom the Western 

 States requires. 



L. reflexa kirtlandiana Lea. This form is not entitled to more 

 than varietal rank. Specimens from the original locality in Ohio 

 agree very closely with examples from southern Michigan. Speci- 

 mens from the St. Mary's River are more slender and more fragile, 

 and are nearer to Utah examples received under this name from 

 Mr. Hemphill. 



