72 LAND AND FRESH WATER MOLLUSKS 



Alaska commanded by Lieutenant Stoney, U. S. N. The true Z. 

 sumassi Baird is apparently a Stagnicola, but the present species 

 belongs to Radix. It is not in the least like L. mighelsi (ampla 

 Mighels) though often given that name. 



Lymnaea (Acella?) kirtlandiana Lea. 



? Limncea exilis Lea, Trans. Am. Phil. Soc, v, p. 114, pi. xix, fig. 82, 1837. 



Ohio. 

 Limncea kirtlandiana Lea, Proc. Am. Phil. Soc, 11, p. 33, 1841 ; Trans. 

 Am. Phil. Soc, ix, p. 12, 1842. — Binney, Land and Fvv. Sh. N. Am., 

 ii, p. 67, 1865. 

 Limncea lanceata Gould, Proc. Boston Soc. N. Hist., 111, p. 64, 1848. — 

 Agassiz, Lake Superior, p. 244, pi. vn, figs. 8, 9, 1850. — Tryon, Mon. 

 Limn., pt. 2, pp. 112-113, P*- xvin, figs. 10, 11, 1872. 

 Range. — Ohio to Nebraska, and northward. 



Poland, Ohio ! Iowa River, Iowa ! Apple Creek, Nebraska ! Pic 

 Lake, north of Lake Superior, in western Ontario ! 



The original types of Lea's Limncea exilis are in 

 the National Museum, and after a careful examina- 

 tion of them I am inclined to believe that they are 

 somewhat abnormal dead specimens of this species 

 rather than a mutation of L. rejlexa, as supposed by 

 Binney; unless we extend L. rejlexa to cover the 



1. "., ,. whole group, which seems to me unwarranted. L. 

 n&a ktrtlandt- . . 



ana Lea. lanceata is an immature specimen of what was earlier 



called kirtlandiana by Lea. The figures of both 

 these forms in Binney's work are uncharacteristic, especially that of 

 lanceata, which shows nothing of the "flatness of its whorls" re- 

 ferred to by Gould in his remarks. 



These shells have all the characteristics of Acella except that they 

 are less fragile, larger, and darker colored. They have the gyrate 

 pillar of Lymnaea and not the plicate columella of Stagnicola, which 

 in other respects they recall. Until an exhaustive anatomical and 

 experimental study of these animals is made, all group-references must 

 be merely tentative. 



Lymnaea (Galba) truncatula Midler. 



Buccinum truncatulum Muller, Verm. Terr, et Fluv., n, p. 130, 1774 



(Europe). 

 Limneus minutus Draparnaud, Tableau, p. 51, 1801 ; Hist., p. 53, pi- III, 



figs. 5-6, 1805 (France). 

 Limnaa ferruginea Haldeman, Mon. Limn., pt. 3, third page of cover, Mar. 



13, 1841 ; pt. 4, p. 49, pi. 13, figs. 19, 20, 1842 (Oregon). 



Range. — Europe, northern Asia and America. 



