Descrvption of a New Species of Helix. 283 



received a communication from Prof. Safford of the Tennessee 

 Geological Survey, telling me that he finds in Tennessee a sys- 

 tem of stratified rocks of great thickness, between the primary 

 and Pottsdam sandstone. 



On the south-east, then, we have the system, on the north- 

 west in the Azoic of Foster and Whitney, on the north in the 

 Huronian of Sir Wm. Logan, and in the north-east in the Taco- 

 nic of Prof. Emmons. 



To our State Survey belongs the honor of its discovery and 

 proper placing of it in the geology of North America. 



XXY. — Descrvption of a !N"ew Species of Helix, from 

 Boiigainsville Island. 



By Wesley Newcomb, M.D., of Oakland, Cal., Corresponding Member. 

 Bead May 28th, 1860. 



Iflelix An^asiana. (nov. sp.) 



T. imperforata globoso-depressa, solida, malleata, rufo-brunnea, epider- 

 mide aureolo-tincta ; spira brevi, obtusa ; anfr. 5 planiusculis, sensim 

 accrescentibus, ultimo ad peripheriam obsolete carinato ; sutura valde 

 impressa, non marginata ; apertura rotundato-hmari, iiitns alba ; peristo- 

 mate reflexo ; marginibus callo tenui junctis ; columellari calloso, dila- 

 tato, adnato. 



Shell imperforate, depressly globose, solid, malleated, epi- 

 dermis reddish brown, tinged with golden ; spire short, obtuse ; 

 whirls 5, slightly flattened, regularly enlarging, the last one 

 slightly keeled at the periphery ; suture well impressed, not 

 margined ; aperture roundly lunar, white within ; lip reflected, 

 the margins joined by a thin callus; columella thick, dilated, 

 adhering. 



Diam. maj. 60, rain. 48, Alt. 34: mill. Aper. 26, mill, longa, 

 27, lata. 



Hah. — Bougainsville Island, 



