THE NAUTILUS. 45 



Polygyra jejuna (Say). Miami and Lemon City. Local and 

 generally rare, but abundant in colonies at certain seasons. On the 

 underside of young cabbage palms in the early morning I found this 

 neat species almost abundant in a small area near the standpipe in 

 Miami. Elsewhere it was very scarce. It hibernates under stones 

 in rock piles. 



Thysanophora vortex (Pfr.). Miami. Abundant in most situa- 

 tions except the pine barrens. 



Thysanophora dioscoricola cceca (Gpy.). Numerous in certain 

 localities on the under surface of the leaves of magnolia and of pal- 

 metto. On the latter sometimes a score can be taken from a single 

 leaf. 



Thysanophora playioptycha granum (Streb.). Miami. Only one 

 specimen secured. 



Family Bulimulid^e. 



Drymcuus dominions Rve. Miami and Lemon City. Rare. The 

 very young of this fragile snail are often found associated with P. 

 dioscoricola caeca, but the adults are seldom seen. 



Ltguus fasciatus (Miill.). Miami. Abundant; distribution lim- 

 ited to a narrow strip of hammock lands bordering the bay not more 

 than one-fourth of a mile wide. Not found in mangroves. Dark 

 colored varieties rare and apparently confined to the most densely 

 forested hammock. This snail is largely eaten by tree crabs, which 

 bite the shells in half during their winter hibernation on the tree 

 trunks. The numerous basal portions of the shells firmly cemented 

 to the trees is evidence of the frequency of this destruction. 

 Family Urocoptidje. 



Urocoptis poeyana (Orb.). Miami. Abundant under stones in 

 pine barrens. Perfect adult specimens with uninjured spires are 

 very rare and when found exceedingly difficult to preserve. 



Macroceramus pontificus (Old.). Miami; rather rare; under 

 edges of flat rocks. 



Cerion incanum (Binn.). Virginia Key. Only dead shells of 

 this species were found on this Key, whither they had probably been 

 carried by the tide from some larger Key. All those secured were 

 inhabited by crabs. 



Family Pupid.e. 



Strobilops labyrinthica Say (Pfr.). Miami and Lemon City ; 

 not rare, preferring moist hammock. 



