322 AMERICAN JOURNAL 



ANGITREMA, Haldeman. 



a. Body whorl with a coronal of tuhercles. 



1. A. geniculata, Said. Figs. 1 — 3. Short, ponderous; 

 spire sliort, conic; body whorl inflated, geniculate; the angle 

 with large conical tubercles. Yellowish-brown, frequently 

 green banded ; columella with a heavy white deposit, some- 

 times tinged with purple above and below. E. Tenn. 



2. A. salebrosa, Conr. Figs. 4, 5. Short, sub-oval, pon- 

 derous ; spire short ; body whorl with a shoulder formed by 

 numerous obtuse tubercles, with generally one or two inferior 

 rows of tubercles, not so distinct. Yellowish-brown. Tennes- 

 see Biver, Florence, Ala. 



Smaller, narrower and not so much shouldered as No. 1 ; the tubercles 

 more numerous, and having a second, and sometimes third row of them. 



3. A. subglobosa, Lea. Figs. 6, 7. Sub-globose, thick; 

 spire scarcely exserted ; whorls 5, the last very large, with 

 a tuberculate shoulder. Yellowish-brown, with two, some- 

 times three broad green bands. Tenn. ; Coosa River, Ala. 



Wider and smaller than No. 2, with shorter spire. The broad green 

 bands are an excellent distinguishing character. 



4. A. Tuomeyi, Lea. Fig. 8. Inflated, rather thick; 

 spire obtusely conoidal, suture impressed ; whorls 5, the last 

 slightly obliquely tuberculate below the suture, forming a 

 slight shoulder ; columella very much incurved. Dark horn- 

 color, with narrow red bands visible within the aperture. 

 N. Ala. 



Spire more elevated, and tubercles proportionally smaller than in the 

 preceding species. 



&. Body whorl encircled above the aperture by two roios of 

 tuhercles, of which the inferior one is most prominent. 



5. A. Jayana, Lea. Figs. 9, 10. Thick, sub-fusiform ; 

 spire exserted, conical; suture linear; body whorl with a 

 shoulder of distant prominent, rather elevated tubercles, with 

 another row upon the periphery ; aperture sub-rhomboidal. 

 Greenish horn-color, with generally several light green bands ; 

 aperture white or blotched with purple. Tenn. 



c. Body ivhorl with a central roiv of tubercles. 



6. A. rota, Reeve. Fig. 11. Globosely turrited, thick, 

 ponderous ; whorls few, concavely sloping, encircled around 

 the periphery with large, obliquely compressed tubercles ; 

 aperture small, sub-rhomboidal ; columella short. Yellowish 

 olive, with a brown band at base. " United States." 



I have not seen this species. The tubercles are described as compressed 

 obliquely, resembling the fans of a water-wheel. 



