Campbell — Rogers's Geology of the Virginias. 357 



up this little eye-like Chazy fossil go twining over and around 

 each other, and up to the present time they have been rarely 

 observed branching and never anastomozing. 



This fossil does not seem near enough any already recognized 

 form to be included in it generically, and until other relation- 

 ships are found it may properly stand by itself a separate genus. 



Strephochetus {6tpkq)oo I twine, oxsroG canal), nov. gen. 

 r^A. free calcareous sponge showing in structure concentric 

 layers composed of minute twining canals./ 



Strephochetus ocettatus, n. sp. 



Type of genus. - A compact calcareous sponge, spherical 

 or slightly flattened, distinctly concentric in character, usually 

 less than half an inch in diameter, forming when in masses, a 

 tough limestone. When weathered the concentric character is 

 very evident, the fossil then looking like little eyes peering 

 from the stone. 



These forms are often gathered in crowded masses, the in- 

 termediate spaces being filled with fragments of the fossil 

 mingled with oolitic grains. More rarely they appear here and 

 there in a mass of oolite, s* 



This fossil occurs in^connection with well recognized Chazy 

 forms and especially with Maclurea magna. It is found in 

 place in the towns of Addison, Bridport, etc., in Addison 

 County, Vermont, and in bowlders in those towns as well as at 

 Crown Point, N. Y. 



Middlebury College. 



Art. XLYII. — William B. Rogers's Geology of the Virginias* 

 A Review ; by J. L. and H. D. Campbell. 



Mrs. ¥m. B. Eogers could not have commemorated the 

 life and labors of her distinguished husband in a more fitting 

 way than she has done, by collecting and editing his reports 

 and other valuable papers on the Geology of the Virginias, 

 which form a neat and compact volume of about 800 pages. 

 The geological survey of Virginia (at that time including West 

 Virginia), for which Prof. Eogers, with a competent corps of 

 assistants, was employed, was never fully completed ; and yet 

 enough had been done to justify his beginning work on his 

 final report, while his assistants were closing up some remnants 



* A reprint of Annual Reports and other Papers, on the Geology of the Vir- 

 ginias. By the late William Barton Rogers, LL.D., etc., Director of the Geolog- 

 ical Survey of Virginia from 1835 to 1841; President of the National Academy 

 of Sciences. New Vork : D. Appleton & Co. 



