144 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
DESCRIPTION OF THE PLATE. 
Fig. 1. Struthiolithus chersonensis Brandt. From superficial deposits in the neigh- 
borhood of Kalgan, China. Obverse, or more weathered aspect, with 
prominent pittings. X $. 
Fig. 2. Reverse aspect of same specimen, showing uncorroded areas. Millimeter 
scale at bottom of the figures. X §. 
(Reproduced from photographs by Mr. C. H. Currier, of Boston.) 
