PAtJNA OP ORTHAULAX PUGNAX ZONE. 25 



Family BULIMULIDAE. 



Genus BULIMULUS Leach. 



Subgenus HYPERAULAX Pilsbry. 



HyperauJax Pilsbrt, Proc. Acad. Nat. Sci., Philadelphia, for 1897, p. 10; Man. 

 Couch., vol. 14, p. 102, 1901 (+Bonnatiius Jousseaume, 1900). Type, 

 BuUmulus ridleyi E. A. Smith. Fernando Noronha Island, Brazil. 



Doctor Pilsbry regards this group as belonging to the immediate 

 vicinity of the South American groups Anctus and Odontostomus. 

 and as probably an early branch of the latter stock before it had 

 divided into the modern genera above mentioned and including 

 Tomigerus. 



The type of the genus is a recent form from the Brazilian island 

 of Fernando Noronha. It bears a very remarkably close resemblance 

 to some of the silex bed species, and there can be no reasonable doubt 

 that they are congeneric. It is a remarkable fact that the group, 

 ^ in the strict sense, includes as far as known only this single living 

 species and the forms known from the silex beds. "Wlij^ species 

 should not have survived on some of the Antilles or on the mainland 

 of South America is a myster3^ The other section of the genus, 

 Bonnanius, which has a conspicuously dentate aperture and short, 

 dumpy shell, is also a denizen of the same island and represented by 

 a single recent species. 



BULIMULUS (HYPERAULAX) FLORIDANUS Conrad. 



Plate 2, fig. 2. 



Bulimus floridanus Conrad, Amer. Journ. Sci., ser. 2, vol. 2, p. 399, fig. 1, 

 Nov., 1846 ; Amer. Journ, Conch., vol. 1, p. 144, pi. 11, fig. 11, 1865 ; not 

 of PfeifCer, 1856. 



BuUmulus longaevus Ancey, Le Naturaliste, May, 1881, p. 414. 



BuUmulus (? Anctus) floridanus Dall, Trans. Wagner Inst., vol. 3, pt. 1, 

 p. 5, pi. 1, fig. 11, Aug., 1890. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. Conrad, 

 Dall, Burns, and other collectors. U. S. Nat. Mus. No. 165010. 



The specimens have been compared with the original type of 

 Conrad, now in the collection of the Academy of Natural Sciences 

 at Philadelphia. Portions of Conrad's shell show traces of distinct 

 fine sharp spiral grooves, but in the process of replacement by silica 

 this fine almost microscopic sculpture is generally lost. 



BULIMULUS (HYPERAULAX) HEILPRINIANUS Dall. 



Plate 2, figs. 1, 10. 



BuUmulus (? Anctus) heilprinianas Dall, Trans. Wagner lust., vol. 3, 

 pt. 1, p. 6, pi. 1, fig. 6&, 10, Aug., 1890. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. Dall and 

 Burns. U. S. Nat. Mus. No. 111962. 



