308 A MANUAL OF AMERICAN LAND SHELLS. 



Cherokee Couuty, IS^ortb Carolina; also in Georgia and Eastern Ten- 

 nessee. It is a species of the Cumberland Subregiou. 



The lower figure was photographed on to the w^ood. 



Jaw as usual, arcuate, ends attenuated, blunt; anterior surface with 

 about 14 stout, separated ribs, deuticulating either margin. 



Lingual membrane long and narrow. Teeth about 35-1-35. Cen- 

 trals with a stout, short median cusp, bearing a very short, blunt cut- 

 ting- point, the outer cusps subobsolete. Laterals 15, like the centrals, 

 but asymmetrical. Marginals wide, low, with one inner, short, broad, 

 sharply bifurcated cutting point, and one shorter, outer, bifurcated cut- 

 ting point. Those figured are very bluntly denticulated; on other por- 

 tions of the same membrane the cutting points are much more devel- 

 oped and more acute (Terr. Moll., Y, Plate VIII, Fig. I). 



The genital system (Terr. Moll., V, Plate XI, Fig. G) is peculiar in 

 several respects. The ovary is very slender, and equals about one-half 

 the length of the oviduct. The epididymis is highly developed, greatly 

 convoluted, stout, four times the length of the ovary. The oviduct is 

 convoluted. The prostate is greatly developed. The penis sac is short, 

 cylindrical, entering the vagina near its base, and receiving both vas 

 deferens and retractor muscle at its apex. The genital bladder is small, 

 oval, with a short duct entering the vagina about the middle of its 

 length. The vas deferens is swollen on leaving the prostate. Testicle 

 not observed. 



Mesodoii Cliristyi, Bland. 



Shell imperforate, depressed, rather solid, with numerous oblique. 

 Fig. 330. rib-like strife, dark horn-colored ; spire short, obtuse; whorls 

 ^^ 4^, rather convex, the last descending at the aperture, slightly 

 angular at the periphery, constricted, above gibbous; base 

 convex, excavated in the middle ; aperture depressed, with 

 M. Christy!, a strong, oblique, lamelliform parietal tooth ; peristome re- 

 flected, with a white callus within. Greater diameter 10, lesser 8"""; 

 height, 4^™"'. 



Eelix Christiji, Blaxd, Ann. N. Y. Lye, vii, 117, pi. iv, figs. 5, 6 (I860).— W. G. BiN- 



NEY, L. & Fr.-W. Sb., i, 141 (1839). 

 Mesodon Cluistiji, Tryon, Am. Jouru. Conch., iii, 40 (1867). — W. G. Binxey, Terr. 



Moll., V, 325. 



Mountains in Cherokee County, ISTorth Carolina; a species of the 

 Cumberland Subregion ; also in liutherford County, North Carolina, 

 Jaw as usual in the genus; 10 ribs. 



