IIG THE NAUTILUS. 



Polygyraobslrlcta c(irolinen«is (Lea). Typical shells collected 

 in heavy woods along the Little Missouri River in the southeast 

 corner of the County. Here there is much cy])res8. 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. 



J*()lygip-(i dausa (Sa.y). Arkudelphia. 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. AN'^helen and southeast corner 

 of the County. 



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

 Deceiper Creek. 



Bidimulvs sp.? Fragments of a Bidimulus were collected in 

 the hills west of Arkadelphia. It is probably dealb<Uus (Say). 



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

 Springs. 



Somatogyrus loheela'i Walker. Ouachita River, type locality, 

 under railroad bridge, Arkadelphia. Rare. 



Somatogyrus amnicololdes Walker. Ouachita River, type local- 

 ity, under railroad bridge, Arkadelphia. Rare. 



Ca/n/je/oma ^ewrmi Walker. ' 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 subulare (Lea)],^ reported from Clark County, 

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

 sibly young elevata were mistaken for this species. 



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



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

 Lee," by Calvin Goodrich. 



'See "Preliminary List of the MoUusca of Arkansas," Geol. Surv. of 

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



