DR. MANTELL ON FOSSIL FORAMINIFERA. 
471 
and intestinal tube are partially filled with a brown granular endochrome, 
and are very distinct. 
Fig. 13. A Rotalia, collected by Mr. Williamson, from a recent deposit of marine 
sand, near Boston, Lincolnshire. In this figure the specimen is repre- 
sented as seen by reflected light, with a power magnifying fifty diameters. 
Fig. 14. The same object viewed by transmitted light ; the body of the animal 
occupies the chambers of the shell, as in the recent state, and closely 
resembles in appearance the fossils above delineated. 
Fig. 15. The shell of a recent Rotalia from the Levant. 
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%* Figures 9, 13 and 14, have been added to the Plate, by permission, since the 
communication w^as read before the Royal Society. 
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