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Mighels, a careful aud enthusiastic worker in the same 

 field. His paper was published in the Proceedings of 

 the Boston Society of Natural History in 1843, and was 

 entitled " Catalogue of the Marine Fluviatile and Ter- 

 restrial Shells of the State of Maine " (Bost. Jour. Nat. 

 Hist., Vol. IV, p. 308). The following is a brief 

 extract from my paper above mentioned. The lines in 

 quotations being taken from Dr. Mighel's paper, while 

 the contrasts as observed by me are printed in italics. 



Mesodon albolabris. " Solitary." Great abundance. 



Anguispira alternata. " Abundant." Not abundant, except on isl- 

 ands. 



Hyalina indentata. " Appears to be rare." Not rare. 



Hyalina electrina. "Rare." Quite common. 



Conulus chersina is more abundant than his words would seem to 

 indicate. 



Strobila labyrinthica. " Found sparingly." Common all over the 

 State. 



Pupillas and Isthmias. Were noted as found sparingly by Dr. Mi- 

 ghels. Most of the species are quite common. 



Zoogenetes harpa. Is now abundant in several parts of the state, 

 and particularly about Portland. Mighels did not find it at the time 

 of the publication of his catalogue. 



Succinea avara. Mighels mentions only one locality. It is now 

 common all over the state. 



Helisoma bicarinata. "Not aware that it is abundant anywhere." 

 Exceedingly abundant. 



Ancylus rivularis. "Found in plenty." One of our scarcest shells. 



Radix ampla. This species was found in great abundance when first 

 discovered in Eagle Lake in the northern part of the state, in company 

 with Physa ancillaria. 



In company with Mr. John M. Gould, I visited this lake in 1859, 

 and a most careful search revealed only a few dead specimens of E. 

 ampla, and not a vestige of Physa ancillaria. Mr. Fuller has since 

 discovered the shell on the shores of Lake Sebago. 



Dr. C. B. Adams first described a species of land snail 

 known as Papilla badia, as occurring in Vermont. The 

 shell differed very slightly from a European species P. 



