MOLLUSCA. 



Order PULM0:N^A1^A. 

 Suborder (tEophtla. 



F:tmily HELK ID.E. 



Subfannly Yitrixin^e. 



(ieims Helicodiscus. {Morse.) 



Subgenus. Species. Station. 



1 HelivOfliscus liuentus, Say. f. On dead wood. 



Genus Hyalina, {G-raij.) 



2 Conulus cbersina, Sar. (Julva.) Beds of leaves. 



3 Gastrodonta interna, Smj. r. In deea;,*'d logs. 



4 multidentata, Binn. f. Under damp leaves 



in ravines. 



5 Hj^alina arborea, Say. Decaying logs. 



6 binneyana, Morse, r. Woods. 



7 indentata, »S'a//. Under stones and leaves. 



8 limatula, nVoY?. f. Under bark of logs. 



9 minuscula, Binn. Under rocks or wood. 



10 nitida, Mull. r. Lumber yards near wa- 



ter. 



11 viridnla, Mice. f. Under leaves in ravines. 

 ^2 Mesompbix intertexta, Binn. d. Xot found nearer tlian 



the Big Miami. 

 13 ligera, >'a?/. Kocky places. 



