EASTERN PROVINCE— INTERIOR REGION SPECIES. 311 



Stout, loner, cyliudrical, receiving the retractor muscle and vas deferens 

 at its summit ; genitil bladder snbconical, on a short, small duct ; the 

 vas deferens is coTivoluted as it leaves the prostate. As already 

 stated, these organs are specifically different from those of albolahris, 

 whose shell is so nearly allied to that of exoletus. 



JTIesodon l^^heatleya, Bland. 



Shell imperforate, depressed, conoid-globose, thin, reddish horn-col- 

 ored, with numerous rib-like slria^, and microscopic granula- Pm. 332.* 

 tions, with very short hairs; spire shortly conoid; suture 

 deeply impressed ; whorls oA, rather convex, the last rounded, 

 slijjhtly depressed at the aperture, constricted; base convex, 

 excavated in the umbilical region; aperture oblique, lunate, 

 with a small parietal, tooth like tubercle; peristome acute, 

 rose-colored, equally angularly reflected, appressed at the 

 columella. Greater diameter 14, lesser 12""" ; height, 7""". ^uyi!^''^' 



JTelix JThrafleiii, Bland, Ann. N. Y. Lye, vii, 118, pi. iv, fig. 19 (I860).— W. G. Binxey, 



L. & Fr.-VV. Sh., i, 145 (1869). 

 Mesodon IVhe/itleyi. Thyon, Am. Journ. Couch., iii, 40 (1867).— W. G. Binney, Terr. 



Moll., V, 3-27. 



Mountains in Cherokee County, Hayesville, Eoan Mountain, Mitchell 

 County, Black Mountain, Pinnacle of Blue Eidge 4,500 feet, iu Korth 

 Carolina. Habersham County iii Georgia. It may prove a species of 

 the Cumberland Subregion. 



Jaw as usual in tlie genus, with about 12 ribs. 



Lingual membrane long. Teeth about G7-1-G7, with over 12 laterals 

 Centrals and laterals as usual in the genus. Marginals higli, nar- 

 row, with one very long cutting point to the single cusp. Outer mar- 

 ginals about as high as wide, with one long, inner, obtusely pointed 

 cutting point, and one shorter, outer cutting point. The first marginal 

 teeth resemble those of thyroides in the single, greatly produced cut- 

 ting point. The extreme marginals, however, are bifid. (Terr. Moll., 

 V, Plate Vlir, Fig. E.) 



The genital system in the specimens received was too decayed to al- 

 low of complete examination. The i^enis sac, however, was in perfect 

 condition. It forms the peculiar feature of the system on account of 

 irs enormous development. It is short, cylindrical, with blunt ends, 

 very stout, three or four times as large as the oviduct, with retractor 

 muscle and vas deferens at its apex. 



* The hirsnic character of the shell is not shc^wn in the figure. 



