THE NAUTILI'S. 31 



Pis. limalulum Sterki. Various places in Alabama. 



Pis. peraltum Sterki. Grenada, Miss., only one specimen, but 

 good and characteristic, collected by Mr. Hinkley. Had been known 

 from Virginia, Kentucky, Illinois and Iowa. A form from Mich- 

 igan referred to it seems to be distinct. 



Pis. noveboracense Pr. Specimens from Alabama and Missis- 

 sippi were referred, somewhat doubtfully, to this widely distributed 

 and very variable species. Some forms from various places of the 

 three states represented partly by hundreds of specimens, are either 

 varieties or distinct species, and still more materials are desirable. 



Pis. utlanticum Sterki. Wetumpka, Ala. 



Pis. singleyi Sterki. Tuscaloosa, Ala. (over 200 specimens) and 

 Columbus, Miss. (Mr. Hinkley); Buxahatchee Creek, Calera, Ala. 

 (Mr. Smith). Somewhat different from the Texas form, rather like 

 those from Frierson, La. (collected by Mr. Frierson), but larger. 



Several other Pisidia have been seen, represented by small num- 

 bers of specimens ; with more materials on hand, they may prove 

 distinct species or varieties. 



Sphserium solidulum Pr. Several places in Alabama and Georgia, 

 variable. Good numbers, e. g., from the Buxahatchee creek, near 

 Calera, Ala., collected by Mr. Smith ; one form closely resembles 

 Ohio specimens regarded as typical, another, in the same lot, is 

 rather different, the sulcation is much finer and the young are of 

 somewhat different shape. The two forms are separable, one by 

 one; whether the latter represent a variety or a distinct species will 

 be ascertained with additional materials. From some places, the 

 specimens were small and poor, yet seemed to be true. 



Sph. stamineum Con. Several places in Alabama and Mississippi; 

 over a hundred good specimens from the Town creek, Montevallo, 

 Ala., " in weeds and mud," collected by Mr. Smith. A few speci- 

 mens in the same lot were rather different, whether distinct, must be 

 made out later. 



Sph. striatinum Lam. Georgia, Alabama and Mississippi. Rather 

 different forms from various places seemed to range under this very 

 polymorphous species. Although many thousands of specimens of 

 " Sph. striatinum " were seen from a wide territory, it has not yet 

 been possible to define geographical varieties to any degree of satis- 

 faction, nor to exclude with certainty such forms as may be con- 

 sidered distinct. 



