AKT. 20 FLORIDA TREE SNAILS SIMPSON 39 



This differs from other forms of erenatus in the large aperture, 

 the incurved columella, and the more oblique outer lip. In most 

 shells the colored lines become abraded during life and sometimes 

 change from green to bronze. In some shells the yellow columellar 

 flush is present; in others it is wanting. 



LIGUUS CRENATUS SUBCRENATUS Pilsbry 



Plate 3, fig. 10 



1912. Liguus crenatus subcienatus Pilsbey, Journ. Acad. Nat. Sci. Philadelphia, 

 ser. 2, A'ol. 15, p. 445, pi. 37, figs. 7, 7a. 



Shell large, rather elongated, thin but strong, with but slightly 

 rounded whorls; surface glassy white except the apical region which 

 is dull or milky white; last whorl having a few spiral green lines 

 which are mostly on the base ; columella thin and straight. 



Length 60, diameter 28 mm. ; length 70, diameter 32 mm. 



Grassy, Lower Matecumbe, and Windleys Keys; Long Island; 

 Key Largo. 



A thinner shell than vacaensis^ and it has less convex sides; it is 

 more glassy, being almost as much so as septentrionalis. Sometimes 

 the later whorls are slightly tinted with green. The shell whose 

 dimensions are last given and which I collected on Windleys Key is 

 the largest Liguus I have seen from Florida. Apparently about a 

 quarter of an inch of its apex has been broken off and sealed up, and 

 if it were perfect it would probably measure 77 mm. It very likely 

 had nine whorls, though most shells of this form have but eight. 1 

 collected Liguus at Cape San Antonio, Cuba, which were quite similar 

 to this subspecies. 



LIGUUS CRENATUS ELLIOTTENSIS Pilsbry 



Plate 3, fig. 11 



1912. Liguus crenatus elliottensis Pilsbry, Journ. Acad. Nat. Sci. Philadelphia, 

 ser. 2, vol. 15, p. 447, pi. 37, figs. 3, 3o, 3b. 



Shell small to medium sized, somewhat inflated, thin and usually 

 fragile, with six to six and a half whorls which are generally but 

 slightly rounded, lusterless white, sometimes having transparent gray 

 streaks, and occasionally dark spiral lines on the lower half of the 

 last whorl ; columella thin and straight or but slightly twisted. 



Length 37, diameter 20 mm.; length of a large dead shell from 

 Old Rhodes Key 44, diameter 25 mm. 



Elliotts Key; Old Rhodes Key; Scott's place on Key Largo (Na- 

 tional Museum collection). 



A small form with rather negative characters, being thin and 

 simply colored. I found a number of dead specimens on Old Rhodes 



