HELIX. 101 



be observed by a powerful lens. The umbilicus is rather large and deep. 

 It is nearly the form of H. Idbyrinthica Say, but is a smaller species, is 

 differently striated, and has no teeth. Found on wet sticks on the mar- 

 gin of a pond. 



HELIX MILIUM MORSE. 



The shell figured on plate 79, figs. 4 and 5, from a draw- 

 ing of Mr. E. S. Morse, was sent me from Portland by 

 that gentleman under this name. To publish it here 

 would be anticipating his own description. 



Since writing the above the description of this species 

 has been published. It is given below, although it 

 appeared after January 1st, 1859, the date to which the 

 subject is brought down. 



It is taken from the Proc. of Boston Soc. Nat. Hist. vii. 

 p. 28, April, 1859. 



Shell minute, transparent, shining ; epidermis white, with a 

 greenish tinge ; distinctly and regularly striated above ; whorls 

 rounded, rapidly enlarging ; suture very deeply impressed ; spire 

 slightly elevated ; microscopic lines running parallel with the 

 whorls, more conspicuous beneath ; umbilicus quite large, deep, 

 and showing all the volutions ; outer lip sharp. Diam. 0.05 ; 

 height, 0.02. 



Distribution. Portland, Me. ; Augusta, Me. ; Bethel, Me. ; 

 Saco, Me. ; Westbrook, Me. 



Observations. The rapidly enlarging whorls remind one at first 

 sight of the young of H. indentata Say. The under side resem- 

 bles slightly the young of H. minuscula Binney. It is about the 

 size of H. minutissima Lea. 



The peculiarities of the shell are its diminutive size, its rapidly 

 enlarging and well rounded whorls, its deep and regular striations, 

 which become obscure at the apex, and the microscopic lines run- 

 ning parallel with the whorls. 



This little shell I first found at Mt. Independence, Westbrook, 

 Me., August 16, 1857, in company with Pupa exigua Say, and 

 the smaller Helices. 



Found generally on low lands, where they seemed to be sur- 



