44 



Observations on the Terrestrial 



preaching this abnoi-mal form has elsewhere been observed in 

 the State. 



Nauta elongata, Say. 

 Occurs in the vicinity of Portland, Maine. I found one speci- 

 men of this species at Bethel, Maine, the only time I have ever 

 noticed it inland. The animal agrees with Say's description in 

 having a white ring surrounding the base of tentacles, a feature 

 which Dr. Gould says he failed to notice in Massachusetts speci- 

 mens. 



ANCYLIN"^. 

 Ancylus parallelus, Hald. 

 Occurs in several places in Cumberland County. The animal 

 i» white throughout, the tentacles are short, blunt, cylindrical and 

 wide apart, head wide, and obtuse : Buccal plate is a thin corneous 

 horse-shoe shaped lamina. The body is capable of turning al- 

 most completely round in its shell. The heart is on the right side 

 of the animal, about midway between the two extremities of the 

 body, and pulsates forty-eight times per minute. 



Ancylus rivularis, Say. 



Quite rare. 



Ancylus tardus, Say. 

 Catalogued by Mighels. 



Ancylus ovalis. nov. sp. {Figs. 101, 102.) 



I propose this, and the following species with some reluctance, 

 as the specitic characters of nearly all the species 

 of this genus are but faintly marked, and the dan- 

 ger of multiplying false species is but too ap- 

 parent ; still believing these to be new, I present 

 th^m. 



Shell very small, depressed, irregularly ovate, 

 (Figs. 101, 102.) apex nearly central, round, smooth and blunt, 



