LIST OF PUBLICATIONS. 



163 



PoGUE, Joseph E. The great rainbow 

 natural bridge of souttiern Utah. 



Nat. Oeog. Mag., 22, 

 No. 11, Nov., 1911, 

 pp. 1048-1056, 6 il- 

 lustrations. 

 A description of a wonderful 

 natural bridge, discovered Au- 

 gust 14, 1900, which is located 

 near the southeast corner of 

 Utah (lat. 37° 03' 21" ; long. 

 110° 56' 48" west of Green- 

 wich), and measures 309 feet in 

 height by 278 feet between 

 abutments. Copies of six nega- 

 tives illustrating the bridge are 

 deposited in the U. S. National 

 Museum. 



ScHALLER, Waldemar T. Crystallized 

 varlscite from Utah. 



Proc. U. 8. Nat. Mus., 

 41, No. 1867, Jan. 

 31, 1912, pp. 413- 

 430, pi. 33, figs. 1, 2. 

 Gives a detailed description 

 of the optical properties, crys- 

 tallography, and chemical com- 

 position, with notes on the oc- 

 currence and gem quality, of 

 well crystallized variscite from 

 near Lucin, Utah. The mate- 

 rial investigated comprises 2 

 specimens now in the U. S. 

 National Museum. 



PALEONTOLOGY. 



Bassleb, Ray S. The early Paleozoic 

 Bryozoa of the Baltic Provinces. 



Bull. V. S. Nat. Mus., 

 77, Dec. 23, 1911, 

 pp. 1-xxi. 1-382, pis. 

 1-13, figs. 1-226. 

 Based largely upon a collec- 

 tion presented to the Museum 

 by the late Dr. August von 

 Mickwitz, of Reval, Russia, 

 upon condition that a detailed 

 study be made of the numerous 

 faunas represented in it. This 

 bulletin presents, so far as pos- 

 sible, a complete account of all 

 Russian Ordovician and early 

 Silurian bryozoa, and is the 

 first detailed inter-continental 

 correlation to be published. 

 The first 53 pages are devoted 

 to a comparisoji of the stratig- 

 raphy and paleontology of Bal- 

 tic Russia and North America. 

 The study of the bryozoan 

 faunas indicates that the great- 

 er part of the Russian Ordovi- 

 cian section may be directly 

 correlated with the Black River 

 group of America, while the 

 Upper Lyckholm and Borkholm 

 limestones of Russia are the 

 equivalents of the American 

 Richmond group. Sixty-five out 

 of 161 species of bryozoa are 

 common to the two areas in 

 the Middle Ordovician beds, 

 while in the higher strata the 

 ratio is still greater. 



Berry, Edward W. A revision of the 

 fossil ferns from the Potomac Group 

 which have been referred to the 



Berry, Edward W. — Continued. 



genera Cladophlebis and Thyrsop- 

 teris. 



Proc. U. S. Nat. Mus., 



41, No. 1862. Oct. 6, 



1911, pp. 307-332. 



This is the last of a series 



of four papers dealing with the 



Lower Cretaceous plants of 



Maryland and Virginia, based 



almost entirely upon specimens 



in the U. S. National Museum. 



Systematic paleontology. Lower 



Cretaceous. (Pteridophyta, Cycado- 

 phytae, Gymnospermse. Monocotyle- 

 donae, Dicotyledonte. ) 



Maryland Ocol. Surt., 

 Loicer Cretaceous, 

 1911, pp. 214-508, 

 pis. 22-97, figs. 2-15. 

 Gives descriptions and illus- 

 trations of all the known fos- 

 sil plants from the Potomac 

 Group of Maryland, as well as 

 numerous species from Virginia 

 and the District of Columbia. 

 A large proportion of the speci- 

 mens illustrated are the prop- 

 erty of the U. S. National Mu- 

 seum. 



GiLMOEE, Charles W. A new fossil 

 alligator from the Hell Creek beds 

 of Montana. 



Proc. U. 8. Nat Mus., 

 41, No. 1860, Sept. 

 9, 1911, pp. 297- 

 302, pis. 26, 27, 

 fis. 1. 

 Describes Brachychampsa 

 montana, a new genus and spe- 

 cies of the Alligatoridae. 



