104 HELICEA. 



Found ai Bethel, Me., in company with Pupa pentodon and Pupa 

 exigua, September 28, 1856. 



Observations. This shell differs from H. annulata Case, in being 

 smaller, the umbilicus not so large, spire not elevated, intercostal 

 space not marked with parallel lines, but finely striated ; the color 

 is also different. 



Its peculiar thin, transparent ribs, depressed spire, and deep 

 umbilicus, are prominent features that can never confound it with 

 other species. 



The above is Morse's description from the Proceedings 

 of the Boston Society of Natural History, March, 1857, 

 vol. vi. p. 128. 



The figure is very much enlarged from a specimen 

 kindly sent me by the discoverer. The species is very dis- 

 tinct, and cannot readily be confounded with any other 

 now known to inhabit America. Another character which 

 easily distinguishes it from the nearest allied species, H. 

 exigua.) is this : the ribs are much less numerous and seem 

 formed by a continuation or lapping over of the epidermis 

 at every period of repose from growth of the shell. 



It is difficult to imagine on what grounds Gould could 

 have based the opinion copied below from the Boston 

 Proc. vi. 72. 



This species, the most minute of any yet observed, was found by 

 Mr. Morse in the vicinity of Portland, and has been collected also 

 at several localities in Massachusetts. Dr. Gould considered it to 

 be the species described by Mr. Lea, under the name of Helix 

 minutissima. It was regarded by Dr. Binney as the young of 

 H. minuscida, but Dr. Gould believed it to be a distinct species. 



HELIX KOPNODES. 



Plate LXXX. Figure 14. 



Testa depresso-globosa, corrugata, subtus lasvigata ; spira brevis, de- 



pressa ; sutura mediocris ; anfr. quinque, rapide accreseentes, ultimus 



permagnus, ventricosus, interdum lineis volventibus crassis notata ; aper- 



tura magna, rotundata ; perist. simplex, acutum, marginibus approximatis. 



