240 SYSTEMATIC PALEONTOLOGY 



Family LITTORINID/E. 



Genus LITTORINA Ferussac. 

 LiTTORINA IRRORATA (Say). 



Plate LVIII, Fig. 1. 



Turbo irroratus Say, 18'i2, Jour. Acad. Nat. Sci. Phila., voL ii, 1st ser., p. 239. 

 Litorina irrorata Dall, 1892, Trans. Waguer Free Inst. Sci., voL iii, pt. ii, p. 320. 



Description. — " Shell thick, greenish or pale cinereous, with numerous 

 revolving, elevated, obtuse, equal lines, which are spotted with abbreviated 

 brownish lines; suture not indented; si)ire acute; labium incrassated, 

 5 ellowish-brown ; lahrum within white and thick, at the edge thin, and 

 lineated with dark brownish; throat white; columella with an indenta- 

 tion; operculum coriaceous." Say, 1822. 



A single somewhat worn specimen of this species has been found. This 

 is the first record of it in the Miocene. 



Length (restored), 14 mm.; diameter, 11 mm. 



Occurrence. — Ciioptank Formation. Choptank Elver. 



Collection. — U. S. National Museum. 



Family FOSSARID/E. 



Genus FOSSARUS Philippi. 



Subgenus ISAPIS H. and A. Adams. 



Fossarus (Isapis) dalli (Whitfield). 



Plate LYIII, Fig. 2. 



Carinorbis (Delphinula) globnlus Heilprin, 1887, Proc. Acad. Nat. Sci. Phila., vol. 



xxxix, p. 404. 

 Not Delphinula globulus H. C. Lea. 

 Trichotropis dalli Whitfield, 1894, Mon. xxiv, U. S. Geol. Survey, p. 127, pi. xxiii, 



figs. 1-4. 



Description. — "Shell rather small, obliquely ovate, ventricose; body 

 volution forming nearly the entire bulk, very ventricose on the side and 

 below, and. somewhat flattened on the shoulder. A'olutions about four in 

 number, the apex slightly mammillated ; aperture round-oval, nearly as 

 wide as long, the peristome entire, in contact Avith the preceding volution 

 on the upper inner side, but not coalescent; umbilicus small but distinctly 



