116 



THE NAUTILUS. 



Polygyra obstricta carolinensis (Lea). Typical shells collected 

 in heavy woods along the Little Missouri River in the southeast 

 corner of the County. Here there is much cypress. Clark 

 County corners at the confluence of the Little Missouri and the 

 Ouachita rivers, the former making the southern and the latter 

 the eastern boundary line. 



Polygyra clausa (Say) . Arkadelphia. Generally distributed. 

 The commonest of the Helices in all this region ! 



Polygyra stenotrema ("Fer." Pfr. ). Arkadelphia and Craw- 

 ford's Mill on Big Deceiper Creek. 



Polygyra monodon (Rack) var. Whelen and southeast corner 

 of the County. 



Polygyra fraterna aliciae (Pils. ). Crawford's Mill on Big 

 Deceiper Creek. 



Bulimulu.s sp.? Fragments of a Bvlimutm were collected in 

 the hills west of Arkadelphia. It is probably dealbatus (Say). 



Amaicola cincinnatiensis ( Anth. ). Big Deceiper Creek at Gum 

 Springs. 



Somatogyms xoheeleri Walker. Ouachita River, type locality, 

 under railroad bridge, Arkadelphia. Rare. 



Somatogyrus amnicoloides Walker. Ouachita River, type local- 

 ity, under railroad bridge, Arkadelphia. Rare. 



Campeloma lewisii Walker. 1 Ouachita and Old Rivers, Arka- 

 delphia, very common; Big Deceiper Lake, nine miles south of 

 Arkadelphia; Caddo River. 



[Pleurocera canaliculata Say]. Reported by Sampson on 

 authority of Call from the Ouachita River in Clark County. 

 Not found. 



Pleurocera elevatum (Say). Ouachita, Caddo and Old Rivers 

 near Arkadelphia; Big Deceiper Lake. 



[Pleurocera subidare (Lea)], 2 reported from Clark County, 

 Ouachita River, by Call in Sampson, 8 was not located. Pos- 

 sibly young elevata were mistaken for this species. 



1 Vide, Nautilus, Vol. XXVIII, pp. 126, 127. 



2 Vide Nautilus, Vol, XXX, pp. 122-124, On " Pleurocera subulare, 

 Lee," by Calvin Goodrich. 



3 See ''Preliminary List of the Mollusca of Arkansas,' ' Geol. Surv. of 

 Ark., 1891, Vol. II, p. 197. 



