THE NAUTILUS. 43 



At this locality the species is not typical ; among several hundred 

 there are few with small or indistinct plication. Most specimens are 

 smooth with the exception of a raised line a little below the suture, 

 which is more or less crenulate. Many specimens are three-banded, 

 the upper one just below the raised line and narrower than the other 

 two. None were found in the Coosa River. 



A. ligata Anth. Wetumpka. The young of this species was often 

 found on the under side of rocks in swift water. 



A. rubiginosa Lea. Coosa River at Wetumpka also found at Wil- 

 sonville. More or less striate, in some striae are remarkably well de- 

 veloped, producing costate specimens with a crenulated outer lip. In 

 form they vary considerably. Some of the plicate specimens have a 

 little resemblance to A. plicata, but evidently are not that species. 



Specimens with an elongated operculum were found in only one 

 situation, on the west side of an island above the Wetumpka bridge; 

 the length of the operculum seemed to have no reference to the size 

 of the shell. Occasionally one will have a clear, white columella. 

 They are generally attached to rocks and pebbles in the current, and 

 the colors show up bright and distinct through the clear water of the 

 stream. 



A. taeniata Con. The specimens I refer to of this species may be 

 a smooth form of nihiginosa. 



FAMILY VIVIPARID.t. 



Viviparus contectoides Binney. n. var. Decatur. In a small 

 swamp deeply shaded by a heavy growth of trees, this species was 

 quite numerous. Mature specimens were rare, the larger part being 

 very young to half grown. 



Tulofoma mugnijica Con. Coosa River at Fort William Shoals 

 and Wilsonville. This species was nearly always found on the 

 under side of rocks where there was little or no current. They were 

 o^nerally in colonies ; it was not uncommon to find 20 or 30 under a 

 single stone a foot square or more. 



T. magnifica Con., variety bimonilifera Lea. Farmer and Wil- 

 sonville. This form was found only in a fossil state. In some places 

 they were numerous in cultivated fields and some distance above 

 high-water mark. The size averaged larger than the living magnifica 

 and the lower row of nodules is more strongly developed. 



T. angidata Lea. Coosa River, Wetumpka; tliis form differs 



