EASTERN PKOVINCE INTERIOR REGION SPECIES, 211 



Pfeifit'er, Desliaves, Cliemuitz, and Eeeve liave confouuded Z. inor- 

 natus with this species, even qnoting in some instances Dr. Binney's 

 figure of inornatus in tbe Boston Journal, which represents an entirely 

 smooth shell. Pfeiffer also quotes H. riifa, De Kay, as a synonym 'of 

 kvvigatiis. It seems rather to be the young of some other species. 



Eeeve figured lawigatus under the name of itiornata, describing it as 

 striate in the text. 



Much confusion regarding the species of this group has existed also 

 among American collectors, who have depended for the names of their 

 shells on their friends rather than on the study of descriptions. 



The species under consideration is at once distinguished from all the 

 others of the grou^) by the fact of its being the only one furnished 

 with strise over the upper surface. 



Jaw as usual in the genus. 



Zonites Iwvigaius (Terr. Moll., V, Plate II, Fig. F) is peculiar in hav- 

 ing no cutting points to the side cusps of the central teeth on its lin- 

 gual membrane, and no perfect lateral teeth (see p. 204). I found in one 

 specimen 28 rows of 19-1-19 teeth. Another specimen had 17-1-17 

 teeth. One-half of one transverse row, with the central tooth, is figured 

 on Plate II, Fig. F. This peculiar dentition distinguishes the species 

 from all its allies. The membrane has peculiarly square ends. 



The ovary is short and vagina long. The genital bladder, with its 

 duct, forms a short, cylindrical, sac-like organ, opening near the base 

 of the vagina and tapering at the apex. The penis sac is long, cylindri- 

 cal, larger. at its apex, where it receives the vas deferens. At its base 

 the penis sac has its opening into the vagina, w^ith a short, stout organ 

 (dj s) with rounded ajjex, where a retractor muscle (r) seems to be at- 

 tached. This organ may be a dart sac or some form of prostate gland 

 (Terr. Moll., V, Plate XI, Fig. E). 



Zonites Riig'eli. 



Shell depressed-globose, perforated, thin, delicately wrinkled, the 

 apical whorls sometimes striate, greenish horn-colored, ^'«- "'^• 



dark smoky above ; spire slightly elevated, apex flat ; 

 whorls 6, slightly rounded, the last globose, scarcely 

 excavated at the perforation 5 aperture large, rounded, 

 oblique; peristome simple, thin, ends slightly ap- 

 proaching, the columellar one scarcely broadened. 

 Larger diameter 19, lesser 15"""; height, 9""". 



Zoiiilvs i;u(/tii, W. G. BiNNEY, Auu. N. Y. Ac. Sc, i, 357, pi. xv, tig. 



H (lo79). Z. Bugdl. 



