52 



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



nielaiitlio coarctata, Lea. — Shell imperforate, ovately turreted, 

 thick, the surface decussated by revolving strife and lines of growth ; light 

 greenish horn color, with 

 darker longitudinal streaks pj^^ io7. 



marking the margins of form- 

 er peristomes, white under 

 the epidermis ; spire elongat- 

 ed, apex entire ; whirls 6, 

 regularly increasing, slightly 

 convex, the last one equalling 

 more than one-half the shell's 

 length, imperforate, some- 

 times compressed and ob- 

 Mdantho coarctata. tusely carinated ; aperture Melantko coarctata. 



