168 Notes on certain Terrestrial Mollusca. 



with fluviatile species to 0. M. "Wheatlej by Professor B. Sil- 

 liman, of Yale College, ^N'ew Haven, to whom I dedicate the 

 species. 



RemarTcs. — This shell in general form may be compared with 

 S. Haydeni W. G. Binn., to which^ indeed it is closely allied, 



Fig 14 Fig. 15. 



8. Haydeni W. G. Binn. S. Hawkinsi Baird. 



but it is more attenuated, the last whorl less tnmid and the 

 aperture more narrow. It is distinguishable from S. HawJcinsi 

 Baird, of Brit. Columbia, having one whorl less and a differ- 

 ently formed aperture. 



Succinea 8tretcliiana, nov. sp. 



T. globoso-conica^ tennis, pelhicida, nitida, striatula, virenti-cornea ; 

 spira brevis, obtusiuscula ; sutnra profunda ; anfr. 3 convexi, ultimus 

 inflatns ; columella arcuata, leviter incrassata, recedens; apertura obliqna, 

 rotundato-ovalis ; perist. simplex, marginibus callo tenui junctis. 



Shell globose conic, thin, pellucid, shining, striatulate, green- 

 FiG. 16. ish horn colored ; spire short, rather obtuse ; suture 



deep ; whorls 3, convex, the last roundly inflated ; 

 columella arcuate, slightly thickened, receding; 



S. Stretchiana . . ^ 



Biani aperture oblique, roundly oval ; perist. simple, 



with the margins joined by a thin callus. 



Long. 6J, diam.' 5 mill ; Ap. 5 mill, longa, medio 4 lata ; 

 anfr. ult. 5i mill, longus. 



Habitat— lAti\Q Yalley. Washoe Co., ]N"evada, on the Eastern 

 Slope of the Sierra xTevada, 6500 feet above the sea. A number 



