] 34 THE NAUTILUS. 



On some specimens of P. clappi the elevated lamellae are in part 

 subobsolete. 



Dentition not yet examined, so that the species may turn out to 

 be a Planogyra rather than a Punctum, 



Punctum californicum n. sp. 



Similar to P. conspectum in the small, deep umbilicus and color. 

 Spire somewhat more elevated ; whorls fully 4, closely revolving, 

 the last decidedly narrower than in conspectum (viewed from above). 

 Surface lusterless, with fine, even, hair-like striation, and in places 

 showing faint traces of spiral striae. Umbilicus narrow and deep, 

 its width contained 4i times in greatest diameter of the shell. Aper- 

 ture wider than high, shaped much as in P. conspecium. 



Alt. 1*14, greatest diarn. 1'85 mm. 



Fish Camp, Fresno Co., California. 



Gastrodonta (Taxeodonta) lamellidens n. sp. 



Shell similar to G. multidentata, but larger, with an additional 

 whorl, and instead of radial rows of teeth having partition-like 

 radial barriers, generally three in the young, one, not far within, in 

 the adult shell. Alt. 1'6, diam. 3*7 mm. 



Thunderhead, Great Smoky Mts. 



This is one of Mr. J. H. Ferriss' finds. It was only obtained in 

 small numbers, but probably is abundant, overlooked on account 

 of the small size. I have not heard of G. multidentata being found 

 so far south as this. 



Gastrodonta collisella percallosa n. \;ir. 



Shell similar to G. collisella or a small ligera with globose base ; 

 having an extremely heavy callus within the outer and basal walls 

 of the aperture, extending about one-third whorl inward ; no lamella. 

 Whorls 7i. Size of G. collisella. 



Mr. Geo. H. Clapp, of Pittsburgh, Pa., when in Philadelphia 

 lately, called my attention to this form. Upon examining the col- 

 lection of the Academy, two trays of it were found, one set collected 

 by A. G. Wetherby (who also supplied Mr. Clapp's specimens), on 

 the Tennessee river, 3 miles above Chattanooga, Hamilton Co., the 

 other by G. A. Lathrop, at Nashville, Tenu. In correspondence 

 with Mr. Wetherby some years ago, we mutually agreed that the 

 shells were a small, heavily calloused variety of G. ligera; but upon 

 reconsideration_I am disposed to rank them rather with G. collisella. 



