36 PHYSA HYPNORUM. 



Color very light yellowish-grey. 

 Foreign Analogue. P. Guildingii, Sw. 

 Geographical Distribution. Near St. Louis, 

 Mr. Emerson: Kentucky and Ohio. 



OBSERVATIONS. 



I am indebted to G. B. Emerson, Esq., Presi- 

 dent of the Boston Society of Natural History, 

 for specimens of this curious shell, which were 

 collected (by himself, I believe) near St. Louis. 

 It is remarkable for the contorted spire, and 

 entire absence of a columellar fold. 



PHYSA HYPNORUM, Lin. 



Plate 5. — Figs. 4 — 9. 



Testa elongata, tenui, polita diaphana: anfractibus 5 — 6 

 planiusculis: spira subacuta. 



SYNONYMS AND REFERENCES. 



Bulla hypnorum, Lin. Syst. Nat., p. 1185. 

 Physa hypnorum, Drap. Moll., pi. 3, figs. 12, 13. 



" hypnorum, Lam. An. sans vert., v. viii. p. 400. 



« " Cuv. Regne An., pi. 26, figs. 5, 6. 



" elongata, Say. Jour. Acad., vol. ii. p. 171. 



