lO TRANSACTIONS OF THE WAGNER FREE 



compressed toward the umbilicus, which is deep, subtubular and small, partly- 

 overshadowed by the reflected pillar-lip ; constriction behind the aperture pro- 

 nounced, narrow, close to the reflection ; aperture very oblique, subcircular, 

 the reflected lips narrow, rather thin, subequal all round, united by a thin cal- 

 lus over the body whorl ; callus within the lower lip thin, small, little eleva- 

 ted, but distinct in fully adult specimens, at the base of the pillar. Alt. of 

 shell 8.0; max. diam. 15.O; min. diam. 12.0 mm. 



Helix crusta var. cunctator Dall. 



Shell smaller, with four and a half whorls, the umbilicus relatively smaller, 

 the base more bevelled toward the umbilicus. Alt. 6.0 ; max. diam. i i.o ; min. 

 diam. 9.0 mm. 



Ballast Point si lex-beds ; also the same formation on the shores of Old 

 Tampa Bay, an arm of Tampa Bay proper, westward from Hillsborough Bay ; 

 collected by Newman, Dall, Shepard and Burns. 



This is much the commonest species of the Ballast Point locality and is 

 frequently very perfectly reproduced by the siliceous pseudomorph. Of the 

 variety three rather encrusted specimens were found. Better material may lead 

 to the belief that it is a distinct species, in which case the varietal name now 

 used will be applicable as a specific name. 



Helix diespiter n. s. 

 Plate I, figures i, la. 



Shell closely resembling H. crusta in form, but larger, with a more covered 

 umbilicus, more horizontally flattened base, and especially a larger and more 

 oval aperture, with a more pronounced expansion where the inner lip joins 

 the body ; the shagreening of the surface is like that of //. crusta, but the in- 

 cremental wrinkles seem relatively stronger. Alt. ii.o; max. diam. 18.0; 

 min. diam. 15.0 mm. 



Ballast Point silex-beds, abundant, but almost always broken and defective ; 

 collected by Dall and Burns. 



This species is closely related to H. crusta, but seems uniformly to differ 

 as above mentioned. The figure is an ideal one, derived from the obvious 

 characters of several partly defective specimens. 



Helix direpta n. s. 



Plate I, figures 7 a, 7 b. 



Shell elevated, stout, subglobose, with five to six and a quarter whorls ; 

 surface nearly smooth, marked with lines of growth and fine, microscopic, 

 close-set spiral striation ; apex rather blunt; whorls moderately full, suture 

 distinct, not deep, the margin not appressed ; base moderately rounded, the 



