68 



LAND AND FRESH-WATER SHELLS OF N. A. [PART II. 



scribed. It may have been mistaken for L. acuta, being about the size 

 and having the aspect of that shelL It may be distinguished from it by 

 having a longer and narrower body whirl, and a shorter and narrower 

 aperture. The fold on the columella is smaller and the outer lip less 

 .curved. It is a smaller species than the refiexu, Say, has one whirl less, 

 and the mouth is longer. In other characters it resembles it, if the re- 

 flected lip be excepted. The aperture is rather less than half the length 

 of the shell. Most of the specimens have an obscure brown line within 

 the maigin of the outer lip. The body whirl is disposed to be flattened, 

 and is irregularly wrinkled. Under the lens, the fine striae which usually 

 are found in the Limnwas, may be observed beautifully displayed over the 

 whole shell. The superior portion of all the specimens sent, have more or 

 less deposit of the oxide of iron, which gives them the appearance of 

 having two colors, (Lea.) 



Limnaea kirtlandiana, Lea, Proc. Am. Phil. Soc, II, 33 (1841) ; Trans. 

 IX, 12; Obs. IV, 12 (1844). 



No. 852t of the collection, so labelled by Mr. Lea, are from 

 Apple Creek, lat. 4t°. 



Mr. Lea's description and a figure drawn from his type are 

 "•iven above. 



Fig. 112. 



Li'iuuaea lamceata, Gould. — Shell moderate, thin, diaphanous, 

 horn-colored, attenuated, delicately reticulated with incremental and re- 

 volving striae ; whirls six, flattened, quite oblique, the last 

 equalling three-fourths of the shell's length ; aperture narrow, 

 almost equalling one-half the shell's length, acute posteriorly ; 

 columella fold conspicuous, acute, scarcely spiral ; labrum with 

 a submarginal chestnut band. Length f , breadth j inch. 



North shore of Lake Superior, " Pic Lake," where it was col- 

 lected by Prof. Agassiz. 



Next to L. gracilis this is the most delicate species we have. 

 It may be compared with L. attenuata and L. rejiexa, from both 

 of which it diifers in the flatness of its whirls, in its aperture, 

 which is proportionally much longer and narrower, and in being only about 

 half their size. It is much like large specimens of Phi/sa fn/jmurttm re- 

 versed. {Gould.) 



Limnaa Innceata, Gocld, Proc. Boston Soc. Nat. Hist. Ill, 64 (1848) ; in 

 AcAssiz' Lake Superior, 244, pi, vii, f. 8-9 ; Otia, 206. 



In addition to Goukrs original description, I am able to add 



