52 



104a, S. Haydeni W. G. Binney. 



„Testa elongato - ovalis , tenuis, pellucida, succinea ; 

 spira parva, acuta; anfr. 3 convexi, ultimus rugis levibus 

 incrementalibus et sulcis crassis spiralibus, interruptis , in- 

 aequaliter notatus ; sutura mediocris ; columella callo levi 

 induta , apicem interiorem a basi testae monstrans ; apertura 

 obliqua, ovalis, 5 / 7 long, testae aequans, ad basin expan- 

 sior, — Long. 21, diam. 9 mill." (B. Coli. Nr. 65.) 



Succinea Haydeni W. G. Binn. in Proc. Philad. Acad. 

 May 1858. 



ß. Minor; long. 15 mill. 



Habitat in prov. Nebraska Statuum Unitorum , var. ß 

 ad Red River of the North. 



104b. S. lineata W. G. Binney. f 



„Testa oblongo - ovata solidiori , albida , vel cinerea ; 

 spira elevata, acuta, sutura impressa, anfr. ternis convexis, 

 lineis crassis parallelis inter rugas incrementales volventibus 

 ornata; apertura oviformis, partem testae dimidiam aequans; 

 columella plicata, pariete callo albo induta. — Diam. 6, 

 alt. 12 mill." (B.) 



Succinea lineata W. G. Binney in Proc. Philad. Acad. 

 Febr. 1857. 



Habitat in provincia Nebraska. 



Obs. „Similis S. vermetae Say , sed forma magis 

 ovali, apertura, anfractibus convexis et spira breviori differt. 

 Cognoscitur inter Succineas Americanas testa solidiori, aper- 

 tura oviformi, et specialiter lineis volventibus in anfr. ultimo 

 positis." 



Vitrina Drap. 

 13a. V. planospira Benson. f 



„Testa suborbiculato-depressa , peripheria rotundato- 

 ovata , tenui , laevigata , obsolete arcuato - striatula , translu- 

 cente, polita, Cornea; spira convexiuscula, superne planata, 

 sutura canaliculato-marginata; anfractibus 3, celeriter ac- 

 crescentibus, ultimo antice depresso , leviter descendente, 



