4G THE NAUTILUS. 



Strobilops hubbardi stevensoni Pilsbry. n. var. Miami. Rare : 

 found only under bark of dead limbs in mangrove swamp. This sub- 

 species was discovered by the writer in mangroves skirting the Bay 

 close to the State Agricultural Experimental Station in the suburbs 

 of Miami, and was found nowhere else. I requested Prof. Pilsbry 

 to name it after my friend Mr. Stevenson, to whose conchological 

 researches and friendly services the success of my work at Miami 

 was largely due. 



Bifidaria contracta (Say). Miami and Lemon City. Rather' rare ; 

 in hammock mold. 



Bifidaria servilis (Gld.). Miami. Very rare, only two specimens 

 being secured. 



Bifidaria pentodon (Say). Lemon City. Rare, one specimen only, 

 from hammock. 



Bifidaria rupicola (Say). Miami. Rare, in moist hammock under 

 bark and leaves. 



Bifidaria rhoadsi Pils., n. sp. Miami, very rare. 



Family ACIIATINID^. 



Opeas octonoides (C. B. Ad.). Miami. Only found in damp 

 mold under hammock trees along the high tide borders of the 

 Miami River. Rare. 



Opeas gracittima (Pfr.). Miami. Associated with the preceding, 

 but less numerous. Sometimes found alive under rocks in same 

 situations. 



Family GLANDINID.E. 



Glandina truncata minor Pilsbry. n. var. Miami, Lemon City 

 and New Smyrna. Abundant. This depauperate form rarely grows 

 to more than half the size of largest truncata. 



Familv ZONITIDJE. 



ii 



Vitrea indentata (Say). Miami and Lemon City. Rarely asso- 

 ciated with Zonitoides arboretis, which it so closely resembles. 



Comihrs chersinus (Say). Miami. Rare ; associated with its more 

 numerous and darker counterpart, Strobilops labyrinthicus, under 

 moist rotten bark of open hammock. 



Guppya (jundlachi (Pfr.) Miami and Lemon City. Not common. 

 Associated with Zonitoides and Vitrea under bark of logs. 



Zonitoides arboreus (Say). Miami and Lemon City. Abundant. 



Zonitoides dallianus (Simp.) Miami. Only eleven specimens 

 found among two hundred arboreus collected. 



