AMERICAN SPECIES OF VERTIGO. 149 



others of normal shape) are from the Gulf States. In a speci- 

 men from ' ' Mt. Taylor, ' ' an artificial mound on the St. Johns 

 River, south of Volusia, Florida, the diameter is two-thirds 

 of the length (pi. 13, fig. 6). Examples from Arizona and 

 Tampico, Mexico, appear to be normal in shape and teeth. 



Specimens from Brownstown, St. Ann's, Jamaica, have 

 strongly developed teeth, the inner end of the lower palatal 

 fold scarcely bent downward, the shape normal. Length 1.2 

 to 1.25 mm. 



33. VERTIGO BERMUDENSIS n. sp. PI. 13, figs. 8, 9, 10, 12. 



The shell is minute, oblong, gray, irregularly rather weakly 

 striate but not polished on account of a microscopic granula- 

 tion. Whorls rather strongly convex, the suture appearing 

 margined by translucence of the shell; last whorl convex in 

 front but becoming flattened and tapering downwards dorsally. 

 Some distance behind the aperture there is a very high, mas- 

 sive, rounded crest, followed by a deep contraction, in which 

 there is a pit behind the prominence of the outer lip. The 

 aperture is piriform, having teeth arranged as in V. milium. 

 The angular lamella is rather long and emerges further than 

 the parietal, which is very long and curved, entering spirally. 

 The columellar lamella is somewhat immersed (sometimes in- 

 conspicuous in a front view) ; it enters horizontally, then turns 

 downward along the axis, much as figured for V. milium. 

 The stout upper palatal fold emerges to the palatal callus. 

 The lower palatal arises farther inward, is high and lamellar, 

 penetrating to the dorsal side where it turns downward 

 slightly. The basal fold is absent, or represented by an in- 

 distinct callus. The peristome is well expanded and projects 

 forward in a rounded "auricle" above the middle of the 

 outer margin. 



Length 1.45, diam. 0.8 mm. ; 5 whorls. 



Bermuda: around Church Cave, Paynter's Vale, near 

 Tucker's Town (S. Brown, Arthur Haycock). 



This species has about the size and shape of V. milium, 

 from which it differs chiefly by the enormous development of 

 the oblique crest behind the lip. The much larger V. numel- 



