214 A MANUAL OF AMERICAN LAND SHELLS. 



paler on the posterior extremity and base ; collar grayish- white ; foot 

 narrow, exceeding in length twice the transverse diameter of the 

 shell; eye-peduncles long and slender. There are well-marked lines 

 running obliquely towards the center of the base of the foot, where is 

 an extremely narrow line, representing, no doubt the locomotive disk. 

 The other characters of Zonites are present in the species, such as the 

 longitudinal furrows and caudal i>ore. 



Jaw (see Terr. Moll,, I, Plate XII, Fig. 7) strongly arcuate, ends 

 rounded ; anterior surface striated ; concave margin with a well-devel- 

 oped median projection. 



Lingual dentition (Terr. Moll., Plate II, Fig. M) : Teeth 38-1-38, 

 with 14 laterals. 



The genital system (figured by Leidy, Terr. Moll., I, Plate XII, 

 Figs. 4-7) is quite complicated. The genital bladder is small, oval, on ] 

 a loug, delicate duct, from about the middle of the length of which 

 there is a connecting duct to the middle of the penis sac and a second 

 duct to the apex of the dart sac. This last organ is long, large at its 

 junction with the vagina, tapering above, and furnished below its apex 

 with an accessory, short, delicate, cylindrical gland, terminating in a 

 small pyriform bulb. The dart is long, delicate, strictly arrow-shaped, 

 with pointed, enlarged head and much thickened at the i:)osterior ter- 

 mination. The penis sac is stout, short, receiving at its apex the vas 

 deferens, on the commencement of which the retractor muscle is in- 

 serted. 



See remarks on the genitalia of Z. intertextus. 



Zonites intertextus. Binney. 



Shell perforated, subpyramidal ; epidermis yellowish horn-color; 

 whorls C or 7, with numerous fine, oblique striae and verv 



Fig. 226. ' ■ ^ 



minute, sprial striae, intersecting each other ; outer whorl 

 with a narrow, light-colored band and an ill-defined, brown- 

 ish band below it; aperture rounded, a little transverse; 

 peristome thin, somewhat thickened within by a deposition 

 z. intertextus. ^^ tcstaccous matter, its columellar extremity slightly 

 reflected at its junction with the base of the shell; perforation small, 

 sometimes nearly obsolete; base whiter than the upper surface. 

 Greater diameter 15, lesser 13^""" ; height, 10™'". 



