48 Calvin Goodrich 



In one case the lines were raised, rough, thickened. In the other the spirals 

 were deeply incised and were much more plainly marked than the first 

 example. 



Measitrcincuts of paratypcs: 



Diameter 



141^2 mm. Ten Island Shoals. St. Clair County 



Hall's Island, Shelbj' County 



Lock 2, St. Clair County 



" 2. " " " " 

 Three Island Shoals, Talladega County 



Fort William " 



Peckerwood " " " 



Coosa River, Schowalter collection 



Anculosa occultata H. H. Smith, new- species 

 Fig. 21 



Shell: Subglobose, the most Neritina-like of all the Anculosae. Thin. Growth 

 lines very delicate, regular, close together. A few revolving striae appear on parts 

 of the shell, are very obscure and do not continue around the whorl. Apex eroded, 

 body whorl very large, broadly rounded at the shoulder, almost flattened, lacks folds 

 or plicae. Suture not very deeply marked. Peristome thin, but firm, straight, flaring 

 so that the aperture is practically round. Columella regularly curved, broadly flat- 

 tened on top, the inner edge almost sharp ; bluish-white with spot of purple at the 

 top, its junction with the peristome lacking the deposit of callous which fills this area 

 in several other species of the genus. Color of shell brown, with four very dark 

 continuous bands. 



Opercuhiin: Thin, red, elongate, apex and basal margin rounded. Growth rays 

 very fine. A few obscure waving lines appear close to and parallel with the right 

 margin. The polar point is placed on the left margin near the base. The spiral lines 

 cannot be made out in entirety, but appear to be widely coiled, as in the operculum 

 of A. sulcata. 



Measurements of type: Altitude, 11 mm.; diameter, 8.}4 mm. Aperture — altitude. 

 6]/2 mm.; diameter, 6% mm. 



Type locality: Coosa River, Duncan's Rifile, Chilton County, Alabama. Herbert 

 H. Smith, collector. 



Type in the Museum of Zoology, University of Michigan ; paratypes in this 

 museum and the Alabama Museum of Natural History. 



The localities in which this species has been collected are Duncan's 

 Rififle, Higgin's Ferry, The Bar, Kutting Ram Shoals and "near the mouth 

 of Yellowleaf Creek,'' all in the Coosa River and within the reaches touch- 

 ing Chilton and Coosa counties. 



Most of the shells, including the young, have the Neritina-like form, a 

 few only being found in this collection which are conic as in the case of 

 the juvenile of hrcznspira Smith, which in a way this species resembles. 



