146 



REPORT OF NATIONAL MUSEUM, 1911. 



Springer, Frank — Continued. 



field expedition was undertaken to 

 obtain authentic evidence bearing 

 upon this question with the re- 

 sults published in this and the 

 paper entitled " The Waverlyan 

 period of Tennessee," by R. S. 

 Bassler. 



Stanton, Timothy W. Fox Hills 

 sandstone and Lance formation 

 (."Cera tors Beds") in South Da- 

 kota, North Dakota, and eastern 

 Wyoming. 



Amer. Joum. Sci., 30, Sept., 

 1910, pp. 172-188. 

 The paleontologic evidence cited 

 is based on Geological Survey col- 

 lections which will be transferred 

 to the U. S. National Museum. 

 The paper is an argument for 

 assigning the Lance formation to 

 the Cretaceous and for correlating 

 it. with a part of the Laramie. 



Walcott, Charles D. Olenellus and 

 other genera of the Mesonacidae. 



Smithsonian Misc. Colls.. 

 53, No. 6, August 12, 

 1910, pp. 231-422, pis. 

 23-44, figs. 10-17. 

 Proposes 4 new genera, 14 new 

 species, and 1 new variety of the 

 Mesonacidae, and redefines, de- 

 scribes, and discusses the known 

 Olenellus-Vike trilobites, distribut- 

 ing them among 10 genera. The 

 telson of Olenellus is shown to 

 have resulted from the great de- 

 velopment of the median spine on 

 the fifteenth segment and the ab- 

 sorption of the posterior rudi- 

 mentary segments and pygidium 

 of Mesonacis and Pcedeumias. 

 Figures the visual surface of the 

 eye of Olenellus gilberti, showing 

 42 facets. 



> Pre-Cambrian rocks of the Bow 



River Valley, Alberta, Canada. 



SmithsonMn Misc. Colls., 53, 

 No. 7, August, 1910, pp. 

 423-431, pis. 45-47. 

 Announces the discovery of a 

 series of strata unconformably un- 

 derlying the Cambrian strata in 

 the Bow Valley of Alberta, giving 

 sections, and proposing the terms 

 Hector and Corral Creek for the 

 beds in question. Accompanied 

 by a topographic and geologic map 

 of the Bow Valley. 



Walcott, Charles D. Abrupt appear- 

 ance of the Cambrian fauna on the 

 North American continent. 



Smithsonian Misc. Colls., 57, 

 No. 1, August 18, 1910, 

 pp. 1-16, with 1 map. 

 Discusses the pre-Cambrian sedi- 

 mentation of North America, con- 

 cludes that the strata were depos- 

 ited in fresh-water lakes having no 

 connection with the ocean, pro- 

 poses the term Lipalian era for 

 the period between the formation 

 of the Algonkian continents and 

 the earliest encroachment of the 

 Lower Cambrian sea, and concludes 

 that the apparently abrupt ap- 

 pearance of the Cambrian fauna 

 is to be explained by the absence 

 on our present land areas of the 

 sediments, and hence faunas, of 

 the Lipalian period. 



Middle Cambrian Merostomata. 



Smithsonian Misc. Colls., 

 57, No. 2, April 8, 1911, 

 pp. 17-40, pis. 2-7. 

 Describes and figures numerous 

 specimens representing a new sub- 

 order of Eurypterid crustaceans. 

 These show the dorsal and ventral 

 surfaces, the branchiae and appen- 

 dages. 



Middle Cambrian holothurians 



and medusae. 



Smithsonian Misc. Colls., 57, 

 No. 3, June 13, 1911, pp. 

 41-68, pis. 8-13, figs. 2-6. 

 Describes and figures 1 new fam- 

 ily and 4 new genera and species 

 of holothurians from the Burgess 

 shale member of the Stephen for- 

 mation, a name which is defined ; 

 and a new genus and species of 

 medusae. 



Cambrian faunas of China. 



Smithsonian Misc. Colls., 57, 



No. 4, June 17, 1911, pp. 



69-108, pis. 14-17, figs. 



7, 7a. 

 Describes and figures 23 new 

 species of fossils collected in 

 China by Eliot Blackwelder, and 

 in Manchuria by J. V. Iddings ; 2 

 new species from Quebec, and 4 

 new species from Alabama. Pro- 

 poses 5 new genera and 1 new 

 subgenus, figuring the type speci- 

 mens of each ; also figures the 

 lype species of 1 old genus. A 

 list gives the new generic reference 

 of all species affected by the 

 changes in the genera. 



