104 THE NAUTILUS. 



Zotiitoides arboreus S;iy. Common everywhere. 



Zonitoides exiguus Stimp. Fairly common. 



Zotiitoides utiliutn Morse. Quite rare. Woodland. 



Pyrni!dnla a/ternnfa Say. Common. 



Pyramidula alternato alba. One living specimen obtained in the 

 north of Woodland. 



Pyramidula striatella Anth. Plentiful. 



Pyramidula striatella? var. Shell greenish-white, animal nearly 

 white. Can I his be Pattda cronkhitei Newc.? It i.s about the same 

 size as P. striuteUit. 



Pyramidula asleriscus Morse. Caribou, Woodland and Maduwaska 

 Lake. Rare. 



Helicodiscus lineatus Say. Widely distributed, nowhere abundant. 



Punctum pi/ymamm Drap. Rare. 



Sphyradium etlentitlum. Drap. Well-distril)Uted. 



Succinea oHii/itn Say. Common everywhere. 



Succinea ocalis Gld. 



Succinea firm-it Say. Common in wet places on lake shores and 

 river fiats, together with S. ovnlis. 



Carychium exfi/mnn Say. Very abundant in wet places every- 

 where. 



Carychium exile Lea. Not common ; found with C. exiijtiuin. 



Aplexa hypnorum Inline. In ditches along the roads in three dif- 

 ferent places in Woodland ; specimens abundant. 



PlnjKn heterostropha Say. Common in all streams. 



Physa aiiciUoritt Say. Only se j n at Square Lake Inlet. 



Lenmcea emaryinata Say == </////>/(/ Mighels and Litniicea emarginata 

 Mighels, Binn. From Cross Lake, Square Lake, Portage Lake, Fish 

 River, Saint John River, at Fort Kent and Aroostook River. 



This is an extremely variable species, Caribou individuals differ 

 greatly in every locality. 



Limncea desicliosa Say. Aroostook River, Caribou stream, Salmon 

 Brook. 



Linmiea huntilis Say. Common in damp places and ditches along 

 the roads. 



Planorbis trivolvis Say. Common in Barren Brook, Caribou. In 

 Caribou Lake, Washbnrn, and in nearly every small lake I have 

 seen in Aroostook county, fine specimens can be obtained. 



Planorbts campanulalus Say. Cross Lake, Square Lake, Eagle 

 Lake and Portage Lake. 



