8 AMPULLARIA GLOBOSA. 



that his own is "less globose" and "flatter on 

 the side and superior part of the whorls." 

 Since Mr. Lea wrote, however, the shell has 

 been found assuming several tolerably distinct 

 forms, as the elongated, pi. 4, fig. 4; the globose, 

 fig. 5; and the oblique, fig. 6. 



This species being found beyond 31 of north 

 latitude, may be considered as occupying the 

 northern limit of an intertropical genus. 



AMPULLARIA GLOBOSA, Swainson. 



SYNONYMS AND REFERENCES. 



A. GLOBOSA, SWAINSON. Zool. Illustrations. 

 Ji. ROTUNDATA, SAY. Disseminator, Aug. 12, 1829, p. 

 245. Mrs. Say's reprint, p. 21. 



DESCRIPTION. 



"SHELL remarkably globose; length and 

 breadth equal, dark brown, but becoming oliva- 

 ceous towards the aperture: spire but little ele- 

 vated: suture moderately impressed: body whirl 



