286 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Bermuda and New Providence, but it is more coarsely striated, and the last 

 whorl is more inflated beknv. 



Jaw as usual ; 1 ribs. 



P. Febigeri (PL VI. Fig. J) has 17 1 17 teeth on the lingual membrane, 

 with 9 laterals, the tenth tooth having a bifid inner cutting point. 



Genitalia as in P. septe?nvolva, cereolus, and Carpenteriana. 



Polygyra pustula, F^R. 



Shell umbilicated, orbicularly depressed, minutely striated, reddish or pale 

 horn-color, hirsute; spire scarcely elevated; whorls 4i, flattened, gradually in- 

 Fig. 184. creasing, the last more convex below, deflected at the aper- 



ture, constricted behind the peristome; umbilicus broad, pervi- 

 ous, with a deep groove marked within the shell by an internal, 

 revolving, ridge-like lamella, branching from a stout, transverse, 

 internal tubercle ; aperture very oblique, narrow, sinuously 

 lunate ; peristome sinuous, white, thickened, acute, somewhat 

 reflected, its terminations joined by a two-forked, elevated, 

 acutely pointed lamina, the basal margin with two approxi- 

 mated acute denticles, the columellar termination entering and 

 somewhat covering the umbilicus. Greater diameter 5, lesser 4 mill. ; height, 

 21 mill. 



Helix pustula, FERUSSAC, Hist, PI. 1. Fig. 1. DESHAYES in FER. I. 78, t. 1. 

 Fig. I. PFEIFFER, Symb., III. 81; Mem., I. 422; IV. 268, excl. /3 ; in 

 CHEMNITZ, ed. 2, I. 376, PI. LXV. Figs. 18-20 (1846). REEVE, Con. Icon., 

 721 (1852). BLAND, Ann. N. Y. Lye., VI. 346, Fig. 1 (1858). W. G. BIN- 

 KEY, Terr. Moll., IV. 94, PI. LXXVII. Fig. 12; L. & Fr.-W. Sh., I. 109 

 (1869). Not of BINNEY. 



Dcedalochila pustula, TKYON, Am. Journ. Conch., III. 62 (1867). 



A species of the whole Southern Region, having been received from Texas, 

 Cedar Keys, St. Augustine, South Carolina, and Lee County, Georgia. 



The groove within the umbilicus is a very marked feature in Ferussac's spe- 

 cies, and though not referred to in his description, is distinctly shown in one of 

 the figures; it is entirely wanting in le/>orina, and also in pustuloides. This 

 groove is not only an external character, but its presence modifies the internal 

 structure of the shell. On opening the base of the last whorl immediately be- 

 hind the aperture, a strongly developed transverse tubercle is seen within, from 

 which a strong ridge-like lamella ums round the umbilical opening, correspond- 

 ing in extent with the groove. This tubercle, and the extension of it, are en- 

 tirely disconnected by a sinus or channel from the floor of the penult whorl. 



The hirsute character of this species is not generally alluded to by authors. 

 The outer edge of the peristome in specimens from St. Augustine is of a deep 

 rose-color. 



