FRESHWATER AND LAND SHELLS. 99 



Helix Californiensis. Plate XXIII. fig. 79. 



Testd globosd, imperforatd, granosd, fused, unifasciatd; anfractibus quinis ; apertura 

 ■subrotundata ; labro rejiexo ; columella lavi. 



Shell globose, imperforate, granose, brownish, single banded ; whorls five; aperture 

 nearly round ; outer lip reflected ; columella smooth. 



Hab. St Diego, Upper California. Professor Nuttall. 



My Cabinet. 



Cabinet of Professor Nuttall. 



Diam. -7, Length -6 of an inch. 



Bernards.— This species is remarkable for its globoseness and the 

 single small dark band placed in the middle of a light and broader one 

 immediately above the centre of the whorl. 



Helix Townsendiana. Plate XXIII. fig. 80. 



Testa obtuso-conied, longitudinaliter striata, rugosa, fusca, umbilicata; anfractibus quinis; 

 apertura, subrotundatd, ; labro reflexo ; columelld lavi. 



Shell obtusely conical, longitudinally striate, rough, brownish, umbilicate ; whorls 

 five; aperture nearly round ; lip reflected ; columella smooth. 



Hab. Wahlamat, near its junction with the Columbia River. Pro- 

 fessor Nuttall. 



My Cabinet. 



Cabinet of Professor Nuttall. 



Diam. 1, Length '6 of an inch. 



Remarks. — In general form, and nearly in size, this species resembles 

 H. thyroidus (Say), but differs from it in being of a darker colour and 

 in being rugose. Under the microscope minute transverse striae may 

 be observed. The lip is beautifully white, and the last whorl near its 



