PLEUROCERA. 103 



Figured from Mr. Lea's plate. The name viridula being 

 preoccupied by Mr. Anthony, I gladly avail myself of the 

 present opportunity to dedicate this species to a gentleman 

 who by his immense labors conducted during a period of 

 nearly forty 3-ears, has done more for the science of conchol- 

 ogy than any other American naturalist. It is closely allied 

 in form to P. Tuomeyi^ Lea, but differs in the striate spire 

 and in the form of the aperture strikingly. In the latter 

 respect it presents rather an unusual type among the Pleuro- 

 cerce. 



45. P. Tuomeyi, Lea. 



Trypanostoma Tuomeyi, Lea, Proc. Acad. Nat. Sci., p. 171, 1862. Jour. Acad. Nat. 

 Sci., V, pt. 3, p. 287, t, 36, f. 111. Obs., ix, p. 109. 



Description. — Shell carinate, somewhat thick, high conical, dark 

 brown; spire attenuate conical; sutures scarcely impressed; whorls 



about ten, flattened ; aperture small, rhomboidal, very dark 



Fig. 196. 

 within ; outer lip sharp, sinuous ; columella a little thick- 

 ened below and very much contorted. 



Habitat. — North Alabama; Prof. Tuomey : Florence, Ala- 

 bama; Rev. G. White. 



Diameter, -45; length, 1-23 inches. 



Observations. — I have about a dozen specimens before me 

 from the two habitats. In outline and size it is perhaps 

 nearest to Melania (Trypanostoma) elongata (nobis) from 

 West Tennessee, but it is easy to distinguish it from that 

 species, by its being rather more slender and its being darker. In 

 outline and color it is very close to Melania (Trypanostoma) Brumbyi 

 (nobis), but it differs in the form of the mouth and in not being 

 striate. The aperture is rather more than one-fourth the length of 

 the shell. I have great pleasure in dedicating this species to ray 

 deceased friend, Prof. Tuomey, to whom I am greatly indebted for 

 many new and interesting species collected by himself while engaged 

 in his geological survey of the State of Alabama. — Lea. 



Closely allied to pyrenellum, Conr., but diliering in the better 

 developed canal, etc. 



