128 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



Additional stratigraphic data aiv presented regarding two of tlie twelve 

 known localities: <illenogle (British Colnniltia) and the Yukon-Alaska bound- 

 ary. Regarding the former (Olenogle) this paper corrects the accepted refer- 

 ence of the Glenogle graptolites to "Kicking Horse I'ass." It regards and dis- 

 cusses the discovery of fossils below, and makes a correction in the stratigraphy 

 of the beds above, the graptolite shales, for which it pi'oposes the formational 

 name Glenogle shales. The beds above are shown to be of Richmond age, the 

 first recorded instance of Richmond beds west of I^ake AVinnipeg and north of 

 the Canadian boundary. Regarding the latter (Yukon-Alaska boundary) this 

 paper lists four new localities in the genei'al Aicinity of the one previously 

 known and presents new light on the stratigraphy of the graptolite-bearing 

 beds, giving a section of the Paleozoic beds south of the Tatonduk River and 

 defining one new formation, the Tatonduk shales. These collections have all 

 been reported on by Doctor Ruedemann, whose reports are copied. There is 

 also recorded a slight change in the recorded localities for Dicranograptus 

 nicflolsoni ivhUkinus (Miller). 



The bearing of the data presented on such questions as the number of 

 graptolite horizons in the West, their origin and dispersal, is discussed and 

 the conclusions drawn that there appear to be several horizons, and that the 

 main channels of communication probably opened to the north. 



The next paper was read by title. 



IS'EW KIND OF TYPE SPECIMEN 

 BY E. L. TROXELL 



The next paper, illustrated by lantern slides and dealing with several 

 Upper Cambrian trilobites of Iowa, was presented by the author and dis- 

 cussed by Messrs. Weller and Chadwick. 



UPPER CAMBRIAN TRILOBITES 

 BY O. T. WALTER 



(Abstract) 



As far as now known, only three trilobites have been reported from the 

 Upper Cambrian of Iowa, namely, Dikehjcephalus minnesotensis Owen, lUrr- 

 nurus quadratus Hall, and a new species of llkmurns, here designated as 

 Illrenurus calvini. These three species are found associated in the Saint Law- 

 rence limestone near Lansing, Allamakee County, Iowa. Ilhvnurits quadratus 

 Hall occurs somewhat doubtfully at this place, while Ilkcnurns calvini is found 

 in abundance and in association with Dikelocephahis minnesotensis. As in the 

 case with the latter, the new Ulanurus is more or less dismembered; a restora- 

 tion brings out several interesting features. The first reference made to I. 

 calvini was by the late Prof. S. Calvin in the Iowa Geological Survey, volume 

 IV, page 58. This species differs notably from I. quadratus in the presence of 

 long postero-lateral extensions of the fixed cheeks. 



Some notes on a trilobite from the province of Szechuan, west China, are 

 also presented. 



