32 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 11, NO. 2 



aration of sandy silica. The figures shown in table 6 roughly sug- 

 gest a ratio of R"0 to SiOo, of i : i, with a variable quantity of water. 

 However, the chemical composition must be considered very doubtful. 



TABLE 5. Analyses op Neotocite, Stratopeite, and a Mineral Near Neotocite- 



100.61 99.86 99.95 100.67 100.30 98.11 



° Part or all of the iron may be present as FeO in which case a correspondingly large 

 part of the manganese will have the form of Mn02. 



TABLE 6. Molecular Ratios Reduced to 100. 



SiO: .30.3 28.6 27.4 



R2O3 3.5 3.2 6.3 



R"0 28.0 26.3 20.2 



H2O 38.2 41.9 46.1 



100,0 100.0 100.0 100.0 100.0 100.0 



*" Ratios after deducting calcium carbonate equivalent to CO-. 



PALEONTOLOGY. — Shell regeneration in aPennsyhanian brachiopod.^ 

 W. Armstrong Price, West Virginia Geological Survey. (Com- 

 municated by Sidney Paige.) 



The accompanying photograph, figure i, shows an area of abnormal 

 sculpture upon the interior surface of a pedicle valve of Derbya crassa 

 (Meek and Hay den). The specimen consists merely of the impres- 

 sion of the interior of the valve in a fine-grained, calcareous sand- 

 stone. It was associated with numerous impressions- of normal shells 

 of this species and with other marine invertebrates. 



1 Published with the permission of the Superintendent of the West Virginia Geological 

 Survey. Received December 13, 1920. 



2 In gray, sandy .shale collected by Mr. David B. Reger, from the Kanawha Black 

 Flint horizon of the Kanawha Group of the Pottsville Series near Summit Station, Web- 

 ster County, West Virginia. 



