206 



octantem longitadinis .Tquantc, anfr. 5 convexiusculis ; sutura modica ; 

 apertura - t longitudinis testae, late lunata ; columella modice arcuata, 

 lamina callosl imluta. 



Long. 1.5; lat. 0.8 poll. Inhabits Louisiana. Rev. I'.. R. Beadle. 



Differs from '•■ truncata in its extreme tenuity, inflated form, short 

 spire, fewer whorls, paler color, finer striation, and nearly straight 

 pillar. 



LlMNEA LANCEATA. L. testa fragili, diaphana, eorneil, attenuata, 

 striis incrementalibus et striis volventibus argute reticulata; spires 

 anfractibus 6 planiusculis perobliquis, ultimo | testae sequante ; aper- 

 tura anoiista, dimidiam longitudinis fere adequante, postice acuta; 

 plica columellari conspicua, acuta, vix spirali ; labro fascia castanea 

 submarginali picto. 



Long. |; lat. \ poll. Inhabits north shore of Lake Superior, " Fie 

 Lake." Prof. Agassiz. 



Next to /.. gracilis this is the most slender species we have. It 

 differs from /.. attenuata and L. reflexa in the flatness of its whorls, 

 its aperture, which is proportionally much larger and narrower, and 

 in being only about half their size. It maybe conmared to a large 

 specimen of Physa hypnorum reversed. 



[T7= Vol. iii. 193, (April, 1850.) 



VaGINULTXS LlBERlANUS. V. corpore ovali, elongato, postice 

 ampliato, fuscato infra pallidiori, maculis inequalibus laceratis nigris 

 utroque asperso et linea" dorsali mediano pallido notato; solea trien- 

 fcem latitudinis adequante, transverse rugosS. ; tentaculis parvis oculi- 

 feris bulbosis. 



Long. 2 ; lat. i poll. Hab. Liberia. Dr. Perkins. 



A smaller and more slender animal than V. Floridanus. Its 

 blotches are also larger and less numerous, and occur underneath, 

 as well as on the back. In form, it compares somewhat with V. 

 Langsdorfii, from Brazil, but not in coloring. 



Si ciiN'i: \ BPUBCA. T. parvfi, fragili, virescente, striis laxis, 

 scabris, lutum cumulantibus ; spiraj anfr. 3 ventricosis ; sutura pro- 

 funda; apertura rotuudato-ovata, trientes duos longitud. testae ade- 

 quante ; columella acuta, vahle arcuata, absque plica. 



Long. &■; hit. ,'-'„ poll. 1 lab. Liberia, on the moist sides of water 

 pits, and in crevices of trees. Dr. Perkins. 



Similar to S. avara in form and in the peculiarity of becoming 

 invested with an earthy coating. It differs in its paler color, and its 

 more arched columella. 



Sucrivi-'. \ helicoidea. T. parvil, late umbilicata, tenui, stra- 

 tninea, supra oblique tirata, infra laevigata; spira depress^, anfr. 3£ 

 rotuudatis, ultimo subangulato ; apertura lunata, alta. 



