PLATE XIV. 53 
OBoLuUsS APOLLINIS Eichwald (p. 381). 
[Text figs. 4, p. 299, and 15, p. 299; and PI. VII, figs. 1-8, 10-17.] 
Figure 6. Exterior of a ventral valve. The portion of the frontal margin anterior to the crack running through it has 
been restored. e 
6a. Exterior of adorsal valve. The portion of the frontal margin anterior to the crack running through it has 
been restored. 
The specimens represented in figures 6 and 6a can not now be located. The National Museum records give 
the locality as 395, Upper Cambrian Obolus sandstone at Joa, near Jegelecht, Esthonia, Russia, and the catalogue 
number as 51525. Six other specimens with this catalogue number are figured on Plate VII of this monograph. 
OBOLUS APOLLINIS MAXIMUS Mickwitz (p. 384). 
(Pl. VII, fig. 9.} 
Figure 7. Exterior of the central and posterior portions of a dorsal valve that illustrates the character of the outer 
surface of the numerous layers of the shell. From Locality 395, Upper Cambrian Obolus sandstone 
at Joa, near Jegelecht, Esthonia, Russia. U.S. Nat. Mus. Cat. No. 51528b. 
7a. Partly exfoliated broken ventral valve, showing the impression of the main vascular sinuses on one of 
the inner layers of the shell, also the laminated character and interior markings of the shell. From 
Locality 336j, Upper Cambrian Obolus sandstone at Staroja Ladoga, Government of Novgorod, Russia. 
U.S. Nat. Mus. Cat. No. 26924a. 
