21 Genitalia and Lingual 



The specimens agree perfectly with the description and fig- 

 ures in, the "Terrestrial MoUusks of the United States." 

 The genital system is also the same as figured by Leidy in 

 the same work, and hy Moquin-Tandon (Moll. Terr, et Fluv. 

 de France). There can be no doubt, therefore, of the iden- 

 tity of the species. 



The figure of the dentition- of this species given by me in 

 L. and F. W. Shells N. A., I, p. 63, f. 105, is drawn from 

 some other species. 



The true L. Jlavus now examined byme has central teeth with subobso- 

 lete side cusps, bearing no cutting points, central ciisp short, with a 

 shoi-t, bluntly pointed cutting point. Laterals like the centrals, but un- 

 symmetrical. Marginals aculeate, the extreme cues bifurcated. Teeth 

 in the lingual examined over GO-1-60. 



The figure by Dr. Leidy published by Mr. Bland and 

 myself (Ann. Lye. Nat. Hist, of N. Y., IX, 285) though 

 unsatisfactory, was, no doubt, drawn from this species. 



The lingual membrane examined by me agrees with the 

 figures given by Heyuemann * of the dentition of L. jlavus. 



Iiimax agrestis, Linn. 



Specimens from Burlington, N. J., of this species, of un- 

 doubted identity, agreeing externally and anatomically with 

 the figures in the "Terrestrial MoUusks of the United States," 

 furnished the lingual membrane here described. 



Teeth 50-1-50, with 14 perfect laterals. Centrals long, narrow, with a 

 middle long cusp, extending to the lower edge of base of attachment, and 

 bearing a long, acute cutting point, extending far below the lower 

 edge; side cusps subobsolete, but bearing well-developed, triangular 

 cutting points. Laterals like centrals, but unsymmetrical by the changed 

 form of the inner cutting point. Marginal teeth aculeate, the extreme 

 ones do not appear to be bifurcate. 



Jaw wide, low, slightly arcuate, with broad median projection. 



* See Mai. Blatt, X. 



