46 



larger and more solid, less convex whorls, a darker and less vari- 

 egated surface. Besides its dark pitchy color changing towards 

 the tip to flammulated fawn color covered by a velvety epidermis, 

 it may be known by its minute, close set revolving lines. 



Melania Vainafa. Testa elongato-conica, lawis, badia (ju- 

 nioribus herbaceis et lineolis flexuosis fuscis pictis) : spira decol- 

 lata, anfr. 4-5 superstitibus, subplanulatis, ultimo plerumque striis 

 distantibus cincto ; sutura marginata : apertura ovata, testa? qua- 

 drantem a?quans. Long. y s , lat. T 3 jj poll. Hub. Falls of Vainafa, 

 Upolu. 



It has the form and general color of small, smooth, specimens 

 of M. Virginica, but the whorls are more flattened, and the front 

 of the aperture is more rounded. 



Melania scitula. Testa gracilis, elongato-conica, decollata, 

 epidermide piceo induta : spira anfr. superstitibus ad 5 valde con- 

 vexis, supernis longitud'malitcr plicatis, infernis spiraliter liratis, 

 prsecipue juxta suturam et ad basim : apertura obovata, quadran- 

 tem testae baud a?quans, antice aliquanto producta ; fauce livido. 

 Long. |, lat. -]- poll. Hub. Upolu. 



It has the form and size of M. abjecta, Ilald., from Alabama, 

 also of M. truncatula, Lam. It is more robust, paler, and the 

 folds are more prominent and on more whorls than in M. plicata. 

 Lea. 



Melania silicula. Testa parva, gracilis, sub-cylindrica, trun- 

 cata, epidermide fusco-castaneo induta : spira anfr. ad 4 super- 

 stitibus, rotundatis, spiraliter liratis, supernis longitudinaliter pli- 

 catis ; ultimo fusco-zonato ; sutura bene impressa ; apertura 

 rotundato-ovata, antice vix producta ; fauce subviolaceo. Long. 

 £, lat. -£ poll. Hdb. Nisqually, Oregon. 



Very much like the preceding, but considerably smaller, more 

 cylindrical, the whorls more plaited, and a band on the basal one. 

 It resembles M. proximo,. Say, which is less cylindrical and with- 

 out folds. 



Melania bulbosa. Testa parva, conico-oblonga, nitida, de- 

 collata, fusco-viridis : spira anfr. superstitibus 2-3 rotundis ; sutu- 

 ra profunda : apertura ovato-rotundata, vix effusa. Long. £, 

 lat. ^ 9 g- poll. Hab. Columbia River. 



