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Genus PLANORBIS. 



Planorbis lentus, Say. Labette Co. (Newlon) ; Barber Co. (Crania). 



In Contribution II, this species was doubtfully recorded under ffeli'soma, 

 which is usually considered as a submenus of Planvrbis. It is a matter of 

 grave doubt whether such a division of American forms has any substantial 

 basis of fact. The specimens submitted and herein reported upon allow 

 the species to stand without mark of doubt. 



Genus LIMNOPHYSA. 

 JLimnopliysa catascopium, Say. Oswego (Newlon). 



l.imiiopli.vsa reflexa, Say. Arkansas Valley at Wichita (Mead). 



These were very poor specimens, but the largest yet received from any 

 portion of the State. 



Genm PHYSA. 



Physa aiiatiua, Lea. Wabaunsee Co. (Miss L. A. Baldwin) ; lieno Cen- 

 tre, (D. H. Platt and L. A. O'Hara); Kansas River and Silver Lake 

 (Quintard). 



P. awttina was originally collected by Maj. F. Hawn, in a "northern 

 tributary of the Arkansas Iliver," and described by Dr. Lea in Proc. Acad. 

 Nat. Sci., Phila., 1864, p. 115; also in Jour. Acad. Nat. Sui., Phila., 2d 

 Series, Vol. VI, p. 171, pi. XXIV, fig. 94. It is very close to Pliysn hawnii, 

 Lea, which was collected by the same gentleman in the Verdigris Iliver, 

 Kansas. A critical revision of the American forms is needed, when, as the 

 facts seem to indicate, both these forms will fall into the synonymy of the 

 ubiquitous and exceedingly-variable Physa heterostropha, Say. 



Physa syriaa. Say. Cedar Creek. Mt, Ida (Snow) ; Ellis (Watson) ; 

 Barber Co. (Cragin) ; Labatte Co. at Oswego (Newlon) ; Wichita (Mead). 



From the last locality came specimens of the var. hildrethiona, which 

 was raised to specific rank by Dr. Lea. No sufficient data have been ob- 

 served to justify the retention of the latter as a species, and it is here 

 ranked as a variety under the species gyrini. This and P. heterostropha 

 will include most of the American so-called species, 



riiysa hawnii, Lea. Cedar Creek at Mt. Ida (Snow) ; Labette Co. at 

 Oswego (Newlon) ; a, pool at Arkansas City (Cragin) ; Shawnee Co. (Quin- 

 tard). 



The reader is referred to the preceding remarks, under Physa au'itina. 

 This form was described as a preliminary description, in Proc. Acad. Nat. 

 Sci., Phila., 1864, p. 115, and finally, with figure, in Jour. Phila. Acad. 

 Nat. Sci., 2d Series, Vol. VI, p. 165, pi. 24, fig. 84. It is often difficult, 

 even impossible, to separate this form from (in'itina on the one hand and 

 heterostropha on the other. In the Arkansas City locality the specimens 

 were found in midwinter not an unusual but by no means a common oc- 

 currence. 



Physa heterostropha. Say. Silver Lake, Shawnee Co. (Quintard). 



See remarks under this species in Contribution II. 



