164 PROCEEDINGS OF THE ACADEMY OF 
more separated than in Helix, and the separate rows are more 
widely removed the one from the other, especially near the outer 
inargin of the membrane. 
Though the simple aculeate form of marginals seems a generic — 
character in Zonites, we find the marginals bifid in Z. fulvus (pl. 
XVII., fig. 5), and bifid or even trifid in Z. Gundlachi (pl. II1., fig. 
10), also for the first four marginals in miliwm. This character 
reminds us of Vitrina (see below); Vitrinoconus (Semper, Phil. 
Archip., 91); Vatrinoidea (Ibid., p. 85); Vatrinopsis (Ibid., p. 86), 
and the numerous genera of disintegrated Nanina; also some 
species of Limax. The first marginals of Z. eriguus have a side 
spur. 
Taking the general characters of dentition into consideration 
Zonites is nearest allied to Limax among our genera, but in the 
latter the marginals are generally more slender or spine-like, and 
have a less sole-like base of attachment. 
The approximate count of teeth in the various species now 
follows :— : 
Zonites capnodes (pl. III., fig. 12; pl. II., fig. 6) has 66—1—66 
teeth, with 9 perfect laterals on each side the median row. An- 
other specimen gave 46—1—46 teeth, with 70 rows of teeth in all. 
Z. fuliginosus (pl. II., fig. 1) gave 87 rows of 64—1—64 teeth. 
Another specimen 57—1—57. Both linguals have 4 perfect laterals. 
Fig. 6 gives the eighth marginal from the outer edge. 
Z. friabilis (pl. II., fig. 4) has 57—1—57 teeth with 6 laterals. 
Fig. b gives the extreme marginals of two adjacent rows. 
Z. caducus: is known only by the description and figure of 
Fischer and Crosse (Moll. Mex. et Guat. 149, pl. VIIL., fig. 13-16). 
There are 75—1—75 teeth with 5 laterals. 
Zonites levigatus (pl. II., fig. 1, 2) is peculiar in having no cut- 
ting points to the side cusps of the central teeth, and no perfect 
lateral teeth. 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 pl. II., fig. 1. A more 
enlarged view of a portion is given in fig. 2. 
1 T will here mention that Semper, Archip., Phil. ‘78, pl. III., fig. 27; 
pl. V., fig. 21, figures the genitalia, jaw, and dentition of a Zonites from 
Tennessee, which he refers to Z. lweubratus, Say. I do not know what 
species he had before him. Z. lweubratus is not found in Tennessee. See 
Ann. N. Y. Lye. N. H., pl. XI., fig. 24. 
