79 



1077 Sphaerium striatinum Lamarck. 

 Connecticut to Alabama; California. Montana. 



1078 Sphaerium sulcatum Lamarck. 

 Maine to Alabama and California. 



1079 Sphaerium tumidum Baird. 



Sumass river, latitude 49 deg., Washington. 



1080 Stenotrema germana Gould. 

 Vancouver Island to Western Oregon. 



1081 Succinea hawkinsii Baird. 

 Tryon, Mong T M 28, t 2 f 31. 



Very narrow, sub-cylindrical, thin, rugosely striate; spire 

 very short, apex mamillary; whorls 2V 2 , suture not impressed; 

 body very long and narrow, the sides flattened, sub-parallel; aper- 

 ture narrow ovate, two-thirds the total length, viewed from the 

 base exhibiting the interior of the whorl to the apex, columella 

 slightly folded above, with a callous deposit. Covered with a 

 rather oblique dark yellow or orange epidermis. Length 1; 

 diameter 5 mm. 



Living: Washington; British Columbia. 



1082 Succinea Nuttalliana Lea. 

 Tryon, Mong T M 26, t2 f 26. 



Ovate conic, very thin, pellucid, shining, striate; spire acute, 

 attenuate; whorls revolving very obliquely; aperture two-thirds 

 the total length, ovate, broadly rounded below, angled above; 

 columella without fold. Light horn color or greyish. Length 15, 

 diameter 8 mm. 



Living: Snake river, Oregon, to Clear Lake, California. 



1083 Succinea oregonensis Lea. 

 Tryon, Monog T M 23, t 2 f 18. 



Elongated oval, thin, diaphanous, shining, striate; spire acute, 

 suture well impressed; whorls 3, well rounded; body seven- 

 eighths and aperture two-thirds the total length; aperture ovate, 

 one-third longer than broad, columella arcuate. Color deep or- 

 ange or golden. Length 9, diameter 6 mm. 



Living: Vancouver Island to Baja California. 



1084 Succinea lineata W. G. Binney. 

 Tryon, Monog T M 23, t2 f 16. 



Oblong ovate, irregularly wrinkled, between which are coarse, 

 remote, revolving lines; spire acute; whorls 3, very convex; aper- 

 ture V 2 the length of the shell, oval; columella folded. Length 

 12, diameter 6 mm. 



Living: Nebraska; British Columbia; northeastern California; 

 Utah. 



1085 Succinea sillimani Bland. 

 Tryon, Monog T M 24-25, t 2 f 21. 



Oblong-ovate; thin, coarsely striate, shining; spire short, acute, 

 suture impressed; whorls 3, convex, much flattened superiorly; 

 aperture oblique, elongate oval, angular above, effuse at base, 

 columella slightly arcuate, with a thread-like thickening above. 

 White? Length 20, diameter 8.5 mm. 



Living: Humboldt Sink, Nevada, to San Joaquin Valley, Cal- 

 ifornia; Washington. 

 1886 Succinea stretchiana Bland. 



Tryon, Monog T M 19, t 2 f 5. 



Globose-conic, thin, pellucid, shining, striatulate; spire short, 

 obtuse, suture well impressed; whorls 3, convex, last inflated; 

 aperture roundly oval, columella arcuate, slightly thickened. 

 Greenish horn color. Length 6.25, diameter 5 mm. 



Sub-alpine Sierra Nevada, California and Nevada, 4,000 to 

 6,500 feet altitude. 



