98 



LAND AND FRESH- WATER SHELLS OF N. A. [PART IT. 



Fig. 1G7. 



also the amount of convexity. The true Aphxa peruviana has a very 

 prominent apex, with sliouldered, swollen body whirl. Allowance must 

 be made in the following measurements for the constant erosion of the 

 apex. A slender specimen measures long. 1.23, long. spir. .27, lat. .63. 

 A swollen specimen long. ].25, long. spir. .24, lat. .7. The largest speci- 

 men must have measured 1.43 ; mean diverg. 60->. 

 Mazatlan ; not common. (^Carpenter.) 



Aphxa aurantia, Carpenter, Brit. Mua- 



Cat. of Mazatl. Shells, p. 179(1856). 



r^Tsx*. A-A Aplexa peruviana, Menke, CARPEXXf^R 



dim, testft Carpenter, 1. 0. 



The shell figured above (Fig. 1G6) 

 was received from Mr. Carpenter. 

 Fig. 167 gives a comparison between 

 Bulinus maugerse and aurantius. 

 They appear to me very nearly re- 

 lated, if not identical. 



B. aurantius. 



B. viaugerce. 



Blllimis nitens, Philippi. — Shell longitudinally ovate, acute, im- 

 perforate, chestnut brown, very smooth and shining ; apical whirls coui- 

 priging one-fourth the whole length ; columellar fold rather prominent, 

 columella short, straight, compressed. 

 Fie. 168. ^'^ is ^^1® largest species of the genus, the whirls, five to 



six^ number, form a conical apex, with moderate suture, 

 the last one being inflated, smaller in the centre ; a sur- 

 face polished, imbroken by lines of growth, and dark 

 brown color further characterize it ; on the suture is a 

 white band reminding one of Natica glaucina ; columella 

 straight, adherent, short, with a well-defined fold ; inner 

 lip thin and adherent throughout, divided into two por- 

 tions, of whicli the lower is thicker and more expanded ; 

 no umbilicus. Long. II4''', diam. 64'"; ap. 8^'" long, 

 Bulinus miens. 3!/" broad. 



Hah. Mexico. 

 Ph. peruviana, Gray, from its description, appears to resemble it nearly, 

 but difl'ers in having a shorter body whirl, which comprises scarcely a 

 fifth of the whole shell's length, and the whirls are more inflated. 

 (^Phllippi.) 



Phj/sa nitens, Puilippi in Kustek, Ch. ed. 2, p. 5, pi. i, f. 1, 2. 



