PIIYSA. 



83 



heterostropha, and presenting netarly the same varieties ; translucent ; tex- 

 ture very thin ; lines of accretion fine ; aperture wide, colu- 

 mella thick, with the fold obsolete, or but slightly impressed. 



Mexico ? India ? 



Specimens of this shell were presented to the Academy of 

 Natural Sciences by Dr. M. Burrough, and Mexico is given as 

 the native country, but as this enterprising traveller also 

 made collections in Indiaj it is not impossible that they may 

 be from the latter country. In either case, the species appears 

 to occur in too great abundance to allow us to suppose that 

 it is now characterized for the first time. Fig. 13 is from a 

 specimen in Dr. Jay's collection, and may be a distinct 

 species. (^Haldeman.) 



Physa osculans, Haldeman, Men. p. 29, pi. ii, f. 13, excl. 

 heterostropha) (1843). 



Subsequent researches have left no doubt of the habitat being 

 Mexico. 



The specimens figured on Plate 2, Figs. 11 and 13, of Halde- 

 man's Monograph were subsequently referred to Physa hetero- 

 stropha. I have, therefore, retained the name osculans (as he 

 suggests) for the Mexican form with narrower aperture and more 

 pointed spire. My figure is copied from his figure 13. See also 

 remarks under Physa heterostropha. 



f. 11, 12 ( = 



Cat. No. 



8978 

 91)09 

 9U1 



No. of Sp. 



Locality. 



San Felipe Springs 



Mexico. 



City of Mexico. 



From whom received. 



Beale. 



Acad. Nat. Sc. Phila. 



Lt. Beale. 



Pliysa mexicana, Philippi. — Shell imperforate, ovate, inflated, 

 light horn-color, thin, dull and not shining, very finely wrinkled ; the 

 apical whirls occupy one-fourth of whole length ; mouth 

 wide ; columellar fold broadly expanded, almost in the centre 

 of the aperture. 



Shell ovate, inflated, formed by five whirls, and covered 

 with fine broken microscopic wrinkles, parallel to the lines 

 of growth, which prevents the surface from being shining. 

 Whirls tolerably arched, forming a depressed suture, last 

 whirl globose. Mouth longitudinally ovate, wide, the inner 

 lip tolerably widely folded, the columella below the fold is 

 appressed, prominent and rimmed — in one individual of only 

 i^l'" the outer lip is furnished with a smoky, reddish thicken- 

 ing. Height ^"', breadth 5|'"; ap. 7''' long. 3|'" broad. 



Hah, Mexico. (^Kiister.) 



