•j:i.j \ ■ Lingual Dentition of Mbllusca. 



Teeth l'.'.l L9. Centrals sub-oval, rounded a1 base, narrowing 

 ,,-,] thi which is squarely truncated ; apex broadly re- 



curved into an obtuse beak, beyond which an- two long, narrow, 

 . like projections. First Beven laterals uniform, in an aln 

 -ht transverse Beries, detached, inclining obliquely toward 

 median line, large, Bquare, broadly reflexed, extending 

 ond the base in a wide, blunt beak, al each side of which arc 



Rio. 10. 



ion'oi PlanorbU trlvol\ is, Bay. 



ally one or more small denticles. These laterals pass gradually 

 into the uncini, which are in curving rows, long, narrow, widely 

 recurved, with variable, Btrong, beak-like dictations on their 

 apices and outer sid< 



There is great variation in the digitatipns on the uncini, no two 

 ol which appear alike. The laterals also vary somewhat in the 

 breadth of their recurved beal 



I . 10, a, represents two central teeth with two of the firsi 

 laterals on thelefl of the median line : b the merging of the laterals 

 into the uncini : and c extreme uncini. b and c are taken from 

 the right of the median line. 



Tulotoma roagniflca, Conrad. 

 Through the kindn< >s ol I >r. E. R. Schow alter, of [Tniontown, 

 bama, we are able to describe the lingual dentition of Tulo- 

 ,,, magnify ■ Conrad. The specimens received from Dr. 

 S- n in the I Alabama. 



Ii v, i.l I that in its lingual dentition Tulotoma is more 



, ,| ,,, | ■■ '1 by (Jill. Proc. A. 'ad. N. 



