744 SCIENTIFIC RECORD FOR 188* 



Coal Rocks of Eastern Virginia," from Transactions of the Association 

 of American Geologists and Naturalists, 1840-'42. Contains descrip- 

 tions of plants with one plate. Also a reprint of " Contributions to the 

 Geology of the Tertiary Formations of Virginia," by W. B. Eogers and 

 H. D. Eogers, from the Transactions of the American Philosophical 

 Society, Philadelphia, 1835 and 1837. Contains descriptions of Miocene 

 and Eocene fossils, with five plates. 



[Rogers, W. B.]. — Geology of the Virginias. Science^ vol. vi, I^o. 126, 

 pp. 17, 18. July, 1885. Cambridge. 



A review of " Reprint of Geological Reports and other Papers on the 

 Geology of the Virginias," by the late William B. Rogers. 1884. New 

 York. 



ScuDDER, S. H. — The Geological History of Myriopods and Arachnids. 

 Eighth annual address of the retiring president of the Cambridge 

 Entomological Club. Fsyche, vol. — , pp. 245-250. January-March, 

 1885. Cambridge. 



A summary of our knowledge of the geologic history of the two 

 groups. The author also gives two tables of the geological distribution 

 of Myriopods and of Arachnids. {Sec Scudder, S. H., in the Amer. Nat, 

 vol. XIX, p. 1210, December, 1885.) 



Scudder, S. H. — Description of an Articulate of Doubtful Relationship 

 from the Tertiary Beds of Florissant, Colo., Memoirs of the National 

 Academy of Sciences^ vol. iii, pp. 1-6, figs. 1-3 on p. 3 (read at Wash- 

 ington, April 20, 1882), published 1885. 



The form is called Planocephalus* aselloidcs. Three figures of it are 

 given on page 3 ; its relations are carefully discussed, and the author 

 concludes that its place is among the Thysanura, between the Ginura 

 and the Symphyla ; that it is of equivalent value to them, and for this 

 new group proposes the name of Ballostoma. 



Scudder, S. H. — New Genera and Species of Fossil Cockroaches from 

 the Older American Rocks. Proc. Acad. Nat. Sci. Fliilad., vol. — , pp. 

 34-39. April, 1885. Philadelphia. 



Des.cribes the new genus Promylacris,^ and the species P. ovale, and 

 the new genus Paromylacris\ and the species P. rotundum. These 

 two genera of Mylacrida; are from the Carboniferous deposits of Mazon 

 Creek, Illinois. Of the Blattinariai he describes the following new 

 genera and species from the Triassic beds of Fairplay, Colo. : Spilo- 

 blattina § 8. Oardineri, 8. triassica, 8. guttata, 8. marginata, Petrahlutfina 



* Planocepbaln.s n. g. from 7rXavdc<o, ■Hecpciki}. f 7tp6, uvXaxpi?. 



t Ttapoi, nvXaycpii. ^ dTtlXoi, Blattina. 



