PULMONATA— PLANOBB1DAE— PLANORBIS PARVUS. 



947 



were found in the washed up grass from the bottom ; but, although carefully 

 searched for, no living individuals were secured. 



Mr. Tryon informs me our specimens are unusually large, with the 

 margin of the aperture expanded like those from the Saint Lawrence River, 

 described by Mr. Whiteaves as Planorbis macrostomus. 



Collected by expedition as follows: — 



No. 



(?) 



(?) 



(?) 



(?) 



(?) 



K 



Locality. 



Ditches near Salt Lake City, Utah 

 Utah Lake, Utah 



Date. 



July, 1872 

 .... do 



Mud flats near Sink of Sevier River, Utah...; Sept., 1872 

 Fillmore Lake, Utah ' Oct., 1872 



Collector. 



Panquitch Lake, Utah 



do.. 



Saguache, Colo . Sept., 1873 



Dr. H. C. Yarrow. 



Dr. H. C. Yarrow and II. W, 



Henshaw. 

 Dr. II. C. Yarrow. 

 Dr. II. C. Yarrow and II. W. 



Henshaw. 

 Dr. II. C. Yarrow. 

 J. Wolf. 



Subgenus Gyraulus, Agass. 

 PLANORBIS PARVUS, Say. 



Planorbis parvus, Say, Nich. Encycl. 1817-19, pi. i, f. fi. — Say, Couch., Binney's e<l., 45, 

 pi. Ixix, f. 6. — Hald., Mon., 1814, 27, pi. iv, figs. 19-23. — Gould, Iuvert., 

 1841, 209, f. 139.— Adams, Verm. Moll., 1842, 156.— DeKay, X. Y.Moll., 1843, 

 63, pi. iv, f. 58.— Anon., Can. Nat., ii, 1857, 208, f. — .— Binney, Land & Fresh 

 Water Shells N". A., pt. ii, 1865, 133, figs. 222-224.— Robeets, U. S. Geol. 

 Surv. Terr., 1870, 468. 



Planorbis concavus, Anthony, Shells of Cincinnati (no desc). 



Planorbis elevatus, Anthony, Bost. Jour. Nat. Hist., iii, 1840, 327, pi. iii, f. lb.— 

 Gould, Iuvert. Mass., 1841, 207.— DeKay, N. Y. Moll., 1843, 65. 



Helix parvus, Eaton, Zool. Text-Book, 1826, 115. 



Abundant throughout the United States. 

 Collected as follows : — 



No. 



Locality. 



Date. 



Collector. 



3 

 I 



South Park, Colo 



July, iS7^ f. Wolf. 



do 



. do 



J 



Do. 









