LIMN^EA. 



31 



the specimens are exactly alike ; but notwithstanding this and the re- 

 markable dili'erence between those represented in the plate, I doubt not 

 they are specifically the same. It is allied to L. decollata, Nobis, but it is 

 readily distinguished from that shell by its amplitude, by a proportionately 

 larger penultimate whirl, by the reflected labrum, by a much broader 

 labium, and by an open umbilicus, which is always entirely closed in L. 

 decollata. I regard that represented by fig. a as the prevailing type of the 

 species. Fig. h is a little shorter, and rather more tumid ; fig. c repre- 

 sents a distorted specimen. (^Mighth.) 



Limns-a ampin, Mighels, Bost. Journ. N. H. IV, 347, pi. xvi, f 1, a, h, c 

 (Apr. 1843); Proc. I, 129 (Oct. 1S43), not of Haetmaxn.'— White- 

 AVES, Can. Nat. (Apr. 1863), VIII, 112, f. 11. 



This is a well-marked species, not easily confounded with any 

 other. The description and Fig. 34 are 

 copied from Mighels. Since their publica- 

 tion, the species seems to have been entirely 

 unnoticed till Mr. Kenuicott found it at 

 Fort Simpson. 



The European species most nearly related 

 to L. ampla is L. auricularia. So strong 

 is the resemblance between some forms of 

 the two that their identity is almost suggest- 

 ed. I have, therefore, copied Moquin-Tan- 



don's figure of L. auricularia. Umncea aurieulaHa. 



Fig. 35, 



Fig. m. 



L.iiniicea decollata, Mighels. — Shell very ventricose, rather thick, 

 subovate or subrotund, in outline an irregular rhomboid ; epi- 

 dermis of an olivaceous green color, rather thin, deciduous ; 

 whirls two to three ; spire very short, generally decollated ; 

 whole surface generally rather rough ; strije of growth coarse 

 and fine alternately ; transverse striae on the body whirl 

 sparse, interrupted, sometimes obsolete ; body whirl com- 

 poses almost the whole shell ; aperture very large, subcam- 

 panulate ; its length is very little greater than the breadth, 

 and occupies more than two-thirds the length of the shell ; 

 labrum rather thin, simple ; fold of the columella very promi- 

 nent. Length .6, breadth .5, height .4 inch. 



' Gnlnaria ampla, Hartmann, 1842, is referred by Reeve to L. auricularia. 

 Should it prove a distinct species, our shell might be called L. mi'jhehi. 



