^8 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. 



Measurcvicnis of paratypcs: 



Altitude Diameter 



22'/4 mm i4'/4 mm. Ten Island Shoals, St. Clair County 



19/2 WA " " " " " 



19 13 " " " " " 



ipi/^ 13^ Hall's Island, Shelby County 



i7y2 UV2 



17 ii'A 



igYz 13^ Lock 2, St. Clair County 



195^ 13 " 2, " 



l6y2 ii'A " 2, " " 



16^ 12 Three Island Shoals, Talladega County 



jg j2 " " 'I " |] 



15^ 12 Fort William " 



18 13 Peckerwood " 



15 iji/^ 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. 



Operculum: 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 uf type: Altitude. 11 mm.; diaiiKter, S'4 mm. Aperture— altitude. 

 61/2 mm.; diameter, 614 mm. 



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

 H. Smith, collector. 



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

 museum and the Alabama Museum of Natural History. 



The locaHties in which this species has Ijccu collected are Duncan's 

 Riffle, Higgin's Ferry, The Bar, Butting Ram vShoals 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 heing found in this collection which are conic as in the case of 

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



