lU 



LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



Fig. 215. 



Diameter, -38 inch (10 millim.); length, -90 inch (23 millim.). 

 Length of aperture, "33 inch (8 millim.) ; breadth of aperture, -18 

 inch (4i millim.). 

 Habitat. — Great Miami River, near Dayton, Ohio. 



Observations. — A fine large species, which seems to 

 exhibit considerable variation, both in form and coloring. 

 The banded varieties are among our most beautiful spe- 

 cies, while we also find those which are of a plain, delicate 

 horn-color, or with bauds but faintly indicated by an 

 almost imperceptible difiference of color in the interior 

 of the mouth, which in these specimens is generally, and 

 in the banded specimens occasionally, tinged with a deli- 

 cate rosy hue. — Anthony. 



The light horn-colored variety alluded to by Mr. Anthony 

 has since been separated by Mr. Lea as T. lahiatum. It is 

 certainly distinct as the whorls are more swollen, shell larger, 

 color different, as is also the aperture. The two figures are 

 from Mr. Anthony's types. 



57. P. vestitum, Conrad. 



Melanin vestita, Conrad, New Fresh Water Shells, p. 57, t. 8, f. 12, 1834. DeKat, 

 MoU. N. Y., p. 101. Wheatley, Cat. Shells U. S.. p. 27. Binney, Check List, 

 No. 287. Brot, List, p. 31. Reeve, Monog. Melania, sp. 322. ML'ller, Synop- 

 sis, p. 47. 



Melania mucronata. Lea, Proc. Acad. Nat. Sci., p. 117, 1861. 



Trypanostoma mucronaUim, Lea, Jour. Acad. Nat. Sci., v, pt. 3, p. 277, t. 36, f. 93. 

 Obs., ix, p. 99. 



Description. — Shell subulate, subturreted; volutions nine, each angu- 

 lated below the middle ; suture deeply impressed ; epidermis smooth, 

 polished, horn-colored, with a dark band revolving below 

 the angle of each whorl ; whorls near the apex acutely cari- 

 nated. 



Observations. — Inhabits small streams in Greene County, 

 Alabama, among the grass which grows on the rocks. The 

 shell is always coated with a deposit which obscures its 

 characters . — Co nrad. 



The following is the description of 



T. mucronatum. — Shell smooth, awl-shaped, thin, diaphanous, straw- 

 yellow; spire extended, pointed; sutures slightly impressed; whorls 



Fig. 217. 



