206 



octantem longitudinis asquante, anfr. 5 convexiusculis ; sutura modica ; 

 apertura -| longitudinis testae, late lunatfi ; columella modice areuata, 

 lamina callosfi induta. 



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



Differs from G. truncata in its extreme tenuity, inflated form, short 

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

 pillar. 



Limnea lanceata. L. testa fragili, diaphanti, cornea, attenuata, 

 striis incrementalibus et striis volventibus argute reticulata ; spirse 

 anfractibus 6 planiusculis perobliquis, ultimo i| testas sequante; aper- 

 tura angusta, dimidiam longitudinis fere adequante, postice acuta ; 

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

 submarginali picto. 



Long. -| ; lat. i- poll. Inhabits north shore of Lake Superior, " Pic 

 Lake." Prof. Agassiz. 



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

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

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

 in being only about half their size. It may be compared to a large 

 specimen of Pkysa Injpnorum reversed. 



03^- Vol. iii. 193, (April, 1850.) 



Vaginulus Lirerianus. V. corpore ovali, elongato, postice 

 ampliato, fuscato infra pallidiori, maculis inequalibus laceratis nigris 

 utroque asperso et lined dorsali mediano pallido notato ; solea trien- 

 tem latitudinis adequante, transverse rugosa ; tentacuHs parvis oculi- 

 feris bulbosis. 



Long. 2 ; lat. ^ poll. Hab. Liberia. Dr. Perl-ins. 



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. 



Succinea spurca. T. parva, fragili, virescente, striis laxis, 

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

 funda ; apertura rotundato-ovata, trientes duos longitud. testas ade- 

 quante ; columella acuta, valde arcuatH, absque plica. 



Long. T 3 ff ; lat. T 2 o \>oW- Hab. 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. 



Succinea helicoidka. T. parva, late" umbilicata, tenui, stra- 

 minea, supra oblique lirata, infra laevigata ; spira depressa, anfr. 3£ 

 rotundatis, ultimo subangulato ; apertura lunata, alta. 



