70 



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



Tig. 135. 



tbe type. It differs from that species in having a longer fuse or basal 

 channel, in which character it approaches the genus lo. 

 It is close!}' allied to monilifemm (nobis), but differs in 

 having a shorter spire ; being channelled on the periph- 

 erj' and having no nodules. There is usually a well 

 defined channel above the periphery, the middle of the 

 lower whorl being carinatc. BcIoav the carina there 

 is usually a single stria. Two specimens of the four 

 before me have a broad single baud on the upper whorls 

 and several bands in the interior. The base of the colu- 

 mella is very much twisted backwards, and the edge of 



the outer lip is disposed to be thickened. The aperture is rather more 



than one-thii'd the length of the shell. — Lea. 



Fig. 13C. 



13. P. moriforme, Lea. 



Trypanostoma moriforme, Lea, Proc. Acad. Kat. Sci., p. 172, 1832. Jour. Acad. Nat. 

 Sci., V, pt. 3, p. 290, t.3G,f. 118. Obs., ix, p. 112. 



Description. — Shell sulcate, subcylindrical, solid, single banded, 

 born-color; spire obtusely conical ; sutures impressed; ivhorls about 

 nine, impressed canaliculate ; aperture rather small, rhombic, white 

 within, with a single band; outer lip acute, A-ery sinuous; columella 

 thickened below and very much twisted. 



Habitat. — Oostenaula River, near Rome, Georgia; Rev. G. White: 

 Tennessee River; Dr. Spillman : Tuscumbia, Alabama; 

 B. Pybas. 



Diameter, -52; length, 1-08 inches. 



Observations. — This is a well characterized species. I 

 have nearly forty specimens from different habitats before 

 me. It is nearly allied to Melanin ( Trypanostoma') infra-" 

 fasciata, Anthony, but it differs in being moi'c solid and 

 being subcylindrical as well as having a more contracted 

 aperture. It has very much the same kind of fine line near the base. 

 It is not quite so angular. The aperture is not quite one-third the 

 length of the shell. It belongs to the group of which Melania {Try- 

 panostoma') canaliculata, Say, may be considered the tj'pe. — Lea. 



The figure is a copy of Mr. Lea's. The peculiar features of 

 this species appear to be well preserved in several specimens 

 before me. Partaking of the general features of canaliculatum, 

 it is yet distinguished by its more cylindrical, elongated form. 



