OP CONCHOLOGY. 225 



Dimemiom. — Length 13 millimetres, diameter 7 mill. 



Habitat. — Oakland, California. Eev. J. Eowell. 



My Cabinet. Cabinet of Mr. Eowell. 



Observations. — Eesembles Ph. sparsestriata, nob., in form, 

 but is at once distinguished from that species by being smoother, 

 with the growth-lines more crowded, and from that and all other 

 Physse by the very peculiar columella, which curves diago- 

 nally to the right at such an angle as to make it appear al- 

 most truncate. It is a pretty species, of medium size, which 

 I received from Mr. Eowell two years ago. A number of 

 specimens are before me. 



5. Physa malleata, Tryon. — t. 23, f. 14. 



Description. — Shell cylindrical or lengthened oval, malle- 

 ated, smooth, much polished, amber-colored; spire moderate, 

 suture not well impressed; aperture somewhat ear-shaped, 

 narrow above, wide and broadly rounded below; columella 

 narrow, turned to the right, tinged with pink, as well as the 

 outer lip. 



Dimensions. — Length 12 millimetres, diameter 6J mill. 



Sabitat. — Hell Gate Eiver, Oregon. "Fandango Valley," a 

 part of "Goose Lake Yalley." W. M. Gabb. 



My Cabinet. Cabinet of Mr. Gabb. 



Observations. — This species does not very closely approach 

 any of the preceding. Ph. propinqua is malleated, but with 

 this, the resemblance ceases entirely. It is more closely related 

 to the following, but differs in having the columella tinged with 

 pink, in having a wider aperture, and a shorter spire. The 

 two species come from far distant localities. 



6. Physa distinguenda, Tryon. — t. 23, f. 6. 



Description. — Shell variable in outline, sometimes cylindrical, 

 sometimes more inflated, lengthened; spire somewhat longer 

 than in the last species; whorls convex, suture well impressed; 

 surface malleated, crowded with growth lines; aperture long 

 and narrow, rather wider below; columella long and narrow, 

 white, almost without fold, turned a little to the right below. 



Dimensions. — Length 13 millimetres, diameter 7 mill. 



Habitat. — Marysville and Stockton, California. Eev. J. 

 Eowell. 



My Cabinet. Cabinet of Mr. Eowell. 



Observations. — The differences between this and the prece- 

 ding species have already been pointed out. It is apparently 



