306 BULLETIN OF THE 
EXPLANATION OF THE PLATES. 
Plate I. , 
Fig. A. Lingual dentition of Hemitrochus Milleri, Pfr. 
Fig. B. Jaw of same. 
Fig. C. Lingual dentition of Plagioptycha Duclosiana, Fér. 
Fig. D. ss ef Bulimulus immaculatus ; b, a marginal tooth. 
Fig. E. sé ee Leptaxis undata, Lowe. 
Fig. F. rf i Bulimulus Schiedeanus, Pfr. 
Fig. G. “4 ss Simpulopsis corrugatus, Guppy. + 
Fig. H. x ‘s Cionella Gloynei, Gibbons. 
Fig. I. ie < Zonites Whitneyi, Newc. 
Fig. J. nf 5 Omalonyx felina, Guppy. 
Fig. K. Mesodon Chilhoweensis, Lewis. 
Fig. L. ff fi Plebecula lurida, Lowe. 
Fig. M. ef og Microphysa Stearnsi, BI. 
Fig. N. Jaw of same. 
Plate IT. 
Fig. A. Chlamydephorus Gibbonsi. 
Fig. B. oh nf lingual dentition. 
Fig. C. Triodopsis vultuosa, Gld., lingual dentition. 
Fig. D. Urocyclus Kirki, Gray, jaw. 
Fig. H. ce a «lingual dentition. 
Fig. F. Hemphillia glandulosa. 
Fig. G. Genitalia of Mesodon devia, Gld.; a, penis sac; 6, genital bladder 
and duct. 
Fig. H. Vitrinizonites latissimus, Lewis, lingual dentition. 
Fig. I. Genitalia of Mesodon Sayii, var. Chilhoweensis. 
Fig. J. Genitalia of Pomatia Buffoniana, Val. 
0. ovary. 
a, accessory gland, 
e. epididymis. 
ov. oviduct. 
v. d. vas deferens. 
g. 6. genital bladder. 
pr. prostate gland. 
p. Ss. penis sac. 
or, external orifice. 
