110 PUPOIDES. 



Molluscan fauna of the Orthaulax pugnax zone of the Oligo- 

 cene of Tampa, Florida, in Bull. 90, U. S. Nat. Mus., 1915, p. 

 29, pi. 1, f. 6) from Tampa Silex bed, Ballast Point, Tampa 

 Bay, Florida. Though described as without teeth, the figure 

 shows three. 



I. American species, nos. 1 to 7. 

 II. Oriental and Ethiopian species, nos. 8 to 23. 

 III. Australian species, nos. 24 to 28. 



I. AMERICAN SPECIES OF PUPOIDES. 



1. Shell distinctly tapering; diam. half the length, more or 



less 2 



Shell cylindric or subcylindric ; diam. decidedly less than 

 half the length 5 



2. An angular lamella represented by a small, callous pad 



joined to the outer lip 3 



Angular lamella a distinct and separate tubercle. 



P. cccnopictus, no. 10. 

 No angular tubercle or pad; 3.4 to 4.2 mm. long, 4*/ 2 to 5 



whorls P. modicus, no. 3. 



3. About 5 mm. long ; 51/2 to 6 whorls ; U. S., Mex., West In- 



dies P. marginaius, no. 1. 



3.6 to 4.2 mm. long, 4% to 5 whorls 4 



4. West Indies P. m. nitidulus, no. la. 



Venezuela P. simoni, no. 2. 



5. North American species 6 



South American; cylindric, with slender riblets. 



P. paredesii, no. 7. 



6. Cylindric ; no angular tubercle or callous pad 7 



Slowly tapering, slender, with a small angular tubercle; 



Mazatlan P. chordatus, no. 6. 



7. With slender, spaced riblets; Arizona, New Mexico. 



P. hordaceus, no. 4. 

 Nearly smooth ; South Dakota to New Mexico. 



P. inornatus, no. 5. 



