534 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Helicina orbiculata tropica (S.). Bulimulus dealhatus. 



Polygyra texasiana (S.)- Zonitoides singleyana. 



triodontoides. Euconulus cher sinus trochulus (S.). 



leporina. Vertigo rugosula. 



fraterna. Strohilops labyrinthicus texasianus 



f. friersoni. (S.) 



/ alicice Helicina orbiculata tropica 'Jan.' 



Pfr. (S.) 



About 36 per cent, of the total number of land snails listed are thus 

 peculiar to the Ozark fauna; but when its boundaries come to be more 

 exactly defined, and the finger-like extensions of the Austroriparian 

 and Sonoran areas along the river bottoms are eliminated, the propor- 

 tion of special forms will probably be increased. 



II. Annotated List of Species. 



With few exceptions, only the species collected by the authors in 

 March and April, 1903, are treated of here. For a full knowledge of the 

 Ozarkian fauna up to this time, Papers 6, 9 to 25 of the Bibliogra- 

 phy appended must be consulted in connection with this. 



The specimens reported below were collected by the authors, except 

 when another collector's name is given in parenthesis. Unless other- 

 wise stated, all records are from specimens, not from the literature. 

 Helicina orbiculata tropica ' Jan' Pfr. 



Missouri: Chadwick, Christian Co. 



Arkansas: Rogers, Benton Co. ; Blue Mt. Station, Logan Co. 



Indian Territory: Limestone Gap, Choctaw Nation; Wyandotte. 

 Polygyra texasiana (Moric). 



Oklahoma City, Okla. (Ferriss). A form with rather weak, irregu- 

 larly developed striation, similar to the Texan transition? between 

 P. texasiana and P. t. hyperolia. Also Petit Jean, Ark., and Limestone 

 Gap, I. T. (Ferriss) ; found by Pilsbry at neither place. 



Mr. Sampson reports this species from Sebastian and Nevada Cos. 

 Ark., and from Indian Territory, opposite Fort Smith, Ark. 

 Polygyra dorfeuilliana Lea.' PI. XX, figs. 13, 14, 15, 16. 



This species is now known to us from the following localities : 



' This species was named for Mr. Dorfeuille, of Cincinnati, proprietor of a 

 museum and place of amusement known in 1827 as "Dorfeuille's Hell." Mrs. 

 TroUope, in Domestic Manners of the Americans, states that "Cincinnati has 

 not many lions to boast, but among them are two museums of natural history; 

 both of these contain many respectable specimens, particularly that of Mr. Dor- 

 feuille, who has moreover some highly interesting Indian antiquities. He is a 



man of taste and science As Mr. Dorfeuille cannot trust to his 



science for attracting the citizens, he has put liis ingenuity into requisition .... 

 He has constructed a pandemonium in an upper story of his museum, in which he 

 has congregated all the images of horror that his fertile fancy could devise, ' ' etc. 



