98 



TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Subgenus MESOMPHIX, Raf. 



Shell umbilicated or perforated, globosely depressed, tliin, striated, reddish 

 horn-color, lighter below, shining; whorls 4^-6; aperture lunar-ovate; peri- 

 stome simple, straight, acute, extremities approaching, that of the columella 

 subreflexed. 



Animal (of Z. fuliginosus) nearly twice as long as the diameter of the shell, 

 blackish, or bluish-black, darkest on the head, neck, and eye-peduncles. Eye- 

 peduncles short in proportion to the length of the animal, and set widely apart. 

 Respiratory foramen in the angle formed by the junction of the peristome with 

 the body-whorl. Base of foot whitish, the locomotive band defined by two 

 very fine lines, or furrows. A double marginal furrow runs along the side of 

 the foot, from the head nearly to the posterior extremity, where it passes up- 

 ward, ami joins that from the opposite side, leaving posteriorly a flattened, 

 rounded extremity, somewhat prominent and glandular. Upon the centre of 

 the extremity is a longitudinal fissure, or sinus, which is sometimes expanded, 

 and at other times closed and invisible. Secretion of mucus from the extrem- 

 ity profuse. 



Zonites capnodes, W. G. Binx. 



Shell depressed, horn-colored or smoky, globose, wrinkled, below smooth; 

 spire short, depressed ; suture moderate ; whorls 5, rapidly increasing, the 

 last very ventricose and large, sometimes marked 

 with coarse revolving lines ; aperture large, round ; 

 peristome simple, acute, ends approached, joined 

 by a slight deposition of brownish callus over the 

 parietal wall, reflected at the small and deep um- 

 bilicus. Greater diameter 35, lesser 28 mill.; 

 height, 13 mill. 



Helix kopnodes, W. G. BiNNEY, Proc. Acad. Nat. 

 8ci. Philad. 1857, 186 ; Terr. Moll., IV. 104, 

 PI. LXXX. Fig. 14. — Pfeiffek, Mon. Hel. Viv., IV. 34(3. 

 Hyalina kopnodes, Tryon, Am. Journ. Conch., II. 248 (1SG6). 

 Zonites kopnodes, W. G. Binxey, L. & Fr.-W. Sh., 1. 284 (1869) excl. Fig. 508 



(= Icevigatus). 

 It may be said to belong to the Cumberland Subregion, though it lias spread 

 into the adjoining subregion. I have actually received it from Uniontown, 

 Perry Co., Ala., where it occurs also apparently subfossil, from Dallas Co., Ala., 

 Stephenson, Ala., and Sewannee, Franklin Co., Tcnn. From Marengo Co., 

 Tenn., also subfossil. 



Animal dirty white, the granules sometimes marked by a darker color, run- 

 ning into a light fawn-color on the top of the back near the head ; eye-peduncles 

 and tentacles darker; upper part of tail is also a slight slate-color, darker be- 



Fig. 19. 



