112 PUPOIDES. 



dina turrita MENKE, Synops. Meth. Moll., 1830, p. 40; no 

 locality or definition ; Cyclostoma marginatum Say quoted as 

 doubtfully the same. Pupa albUabris (Ward MS.) C. B. 

 ADAMS, Amer. Journ. of Sci., xl, 1841, p. 271 (substitute for 

 marginatus Say) ; Thompson's Vermont, Moll., 1842, p. 158. 

 Bulimus exiguus REEVE, Conch. Icon., v, 1850, pi. 88, fig. 654 

 (St. Domingo, Salle). Pupa arizonensis GABB, Amer. Journ. 

 of Conch., ii, 1866, p. 331, pi. 21, f. 6 (Fort Grant, Arizona). 



The distribution is given above from specimens seen. 

 Localities on the Spanish main are mentioned by Gibbons, 

 but I have not confirmed them. Dr. Sterki has stated that 

 Curacao specimens in the Mazyck collection are typical. In 

 the United States it may be found in all the states from Ari- 

 zona and Colorado eastward, but, so far as I know, nowhere 

 at high elevations, either in the West or in the Alleghenies. 



The size varies considerably in the same colony. Around 

 Philadelphia (pi. 12, fig. 1) some lots run from 4.2 to 4.8 mm. 

 long. In others the largest are 5 mm. long. It prefers places 

 where the rock is limestone, though also common elsewhere. 

 The living shell is usually more or less coated with earth or 

 excrement. 



Figs. 2, 3 represent shalls from Washington Co., South Da- 

 kota. The prominence of the angular tubercle varies, as in 

 most Western lots. 



In a lot from near Monterey, Nuevo Leon, Mexico, the size 

 ranges from 4 mm. long, 5% whorls, to 5 mm., 6 whorls. 



In Arizona the shell is often small and delicate, length 4 

 mm., hardly over 5 whorls, with scarcely any callous pad in 

 the angle of the mouth (pi. 12, fig. 4, Plumosa Range about 8 

 miles east of Quartzsite, western Arizona), thus resembling 

 P. modicus; but in the same lots there are also larger shells. 



The most slender examples are from the Gulf States (pi. 

 12, fig. 5, Big Wills Valley, Alabama), measuring, length 5, 

 diam. 2 mm., 6y 2 whorls. 



The West Indian shells (pi. 12, figs. 6, 7, Castillo de Jagua, 

 entrance of Cienfuegos Bay, Cuba) are mainly typical in 

 form, the angular callus strongly developed but in some lots 

 there are also broader shells than any seen from the United 

 States. Those figured measure : 



