124 THE NAUTILUS. 



between these Terra Noire rubiginoaas and the Ouachita undatas 

 was collected in the Saline River, at Benton, and this Dr. 

 Walker unhesitatingly calls cerina. 



Fimconaia cerina (Con). Caddo River, Arkadelphia. 



Fitaconaia undata (Bar).' Ouachita River, Arkadelphia and 

 Skillern's Shoals; Old River. A common species. 



Qaadrula coccineum (Con.). A typical specimen was taken 

 from the Ouachita at Arkadelphia in 1913; another was col- 

 lected in June 1914. 



Quadrula solida (Lea). A rare species collected only from the 

 Ouachita River near Arkadelphia. 



Fusconaia cbena (Lea). Ouachita River, Arkadelphia and 

 Skillern's Shoals; Old River. Abundant. 



Sphaerium striatimim Lam. Big Deceiper Creek five miles 

 West of Arkadelphia; Gum Springs: Big Deceiper Lake. 



Musculiuni transversiim (Say). Big Deceiper Lake (teste 

 Sterki). 



Summary. 



Pulmonate Gastropoda 45 



Operculate Gastropoda 7 



Pelecypoda, all of which are Naiades except two 60 



Total species 112 



Bibliography. 



Sampson, "Preliminary List of the Mollusca of Arkansas," 

 Published in the Annual Report of the Geological Survey of 

 Arkansas, Vol. II for 1891, pp. 181-199. 



Call, "A Study of the Unionidae of Arkansas ", Transactions 

 of the St. Louis Academy of Sciences. 1895, pp. 1-65, Plates 

 I-XXI. 



Ortmann, "Notes upon the Families and Genera of the 

 Najades", Annals of the Carnegie Museum, Vol. VIII, No. 2, 

 1912, pp. 222-365, Three Plates. 



Ortmann, "Studies in the Najades". Nautilus, Vol. 

 XXVIII, pp. 129-131 (Caruncidina pnrva); Ditto, XXVIII, 



> See Nautilus, Vol. XXIV, pp. 6-10, 16-24, with plates. On the Validity 

 of Unto undatuf, Barnes, by Bryant Walker. 



