PLATE XII. 47 
Oxotus? (WEsTONIA ?) LAMELLOSUS (Barrande) (p. 463). 
Ficure 7. Enlargement of a dorsal valve, the type specimen. Copied from Barrande [1879b, Pl. OVI, fig. 1: 2A]. 
7a. Surface and lamelle of shell greatly enlarged. Copied from Barrande [1879b, Pl. CVI, fig. 1: 3f]. 
7b. Elongate dorsal valve. Copied from Barrande [1879b, Pl. OXI, fig. rx: 2A). 
. 7c. Distorted ventral ? valve. Copied from Barrande [1879b, Pl. CXI, fig. 1x: 1A]. 
7d. Enlargement of the surface of the specimen represented in figure 7c. Copied from Barrande [1879b, Pl. 
CXI, fig. rx: 1f]. 
The specimens represented are all from Locality 303 1, Lower Ordovician, Etage dl, Libetschoy, Bohemia. 
: OBoLus COMPLEXUS Barrande (p. 387). 
[PI. XII, figs. 3 and 3a.] 
Ficures 8 and 8’. Cast of interior and side outline of a ventral ? valve from Locality 303i, Lower Ordovician, Etage 
dl, Kruschna Hora, Bohemia. Copied from Barrande [1879b, Pl. XCV, figs. m1: 1A and 1B, respec- 
tively]. 
8a. Supposed cast of interior of dorsal valve from Locality 303h, Lower Ordovician, Etage dl, Milinsky Wrch, 
near Woleschna, Bohemia. Copied from Barrande [1879b, Pl. XCV, fig. m1: 2C]. 
OBOLUS FEISTMANTELI (Barrande) (p. 391). 
(Pl. XII, figs. 1, la-f.] 
9. Cast of the inner surface of the frontal rim of the shell, greatly enlarged. Original in the Museum of Com- 
parative Zoology; cast in the United States National Museum (Cat. No. 57088d). 
9a. Traces of the minute terminal vessels that cross the inner surface near the anterolateral margins of the 
shell; greatly enlarged from a portion of the surface of the specimen represented by figure le. Original 
in the Museum of Comparative Zoology; cast in the United States National Museum (Cat. No. 57088c). 
The specimens represented are both from Locality 303i, Lower Ordovician sandstone, Etage dl, Kruschna Hora, 
Bohemia. 
