494 Scientific Intelligence. 



The species of Diatoms peculiar to it are : Coscinodiscus perforatus, 

 Aulacodiscus crux^ Eupodiscus Rogersii, and 3Iastagonia actinop- 

 tychus. Mr. Stodder gives a list of the species afforded by the 

 several beds.— Proc. Boston Soc. Nat. Hist., xviii, 206, 1875. 



1. Carboniferous Articulates. — Mr. S. H. Scudder has described 

 (Canadian Naturalist, April, 1876) a fossil larve from a Car- 

 boniferous shale near Sydney, Cape Breton, which he refers to a 

 genus near Libellula, and names provisionally Lihellula Carhona- 

 ria; and also, accompanying it, part of a wing of a Cockroach, 

 which he names Blattina sepulta. 



Mr. Scudder has also published a supplement to his paper on 

 Carboniferous Myriapods (noticed in this Journal, III, vi, 225) in 

 the Memoirs of the Boston Society of Natural History for 1875, 

 giving figures of the specimens there described. 



Mr. H, Woodward has described a new fossil Scorpion, from 

 the British Coal-measures, at Sandwell Park and Skegby Collieries, 

 naming it Eoscorpius A nglicus ; also a gigantic Orthopterous In- 

 sect, from Scotland, which he calls Lithomantis carbonarius. — 

 Q. J. Geol. /Soc, xxxii, 57, 60, 1876. 



8. Note on the Uinta and Wahsatch Manges: A Correction. — 

 In vol. Ill, chapter 7, of the reports of the United States Geolog- 

 ical Exploration of the Fortieth Parallel, in mentioning the Wah- 

 satch and Uinta ranges, I stated that the date of their uplift was 

 at the close of the Jurassic period. The chapter was written in 

 1869, after a brief visit to the two ranges and before the final de- 

 of horizons and fossils were effected. In 1870-'71-'72 



a more careful examination revealed the fact that the more impor- 

 tant uplift of these two ranges occurred at the close of the Creta- 

 ceous, and not at the close of the Jurassic period. The error had 

 arisen from the extremely close resemblance of certain conglome- 

 rates of the lower Eocene with those of the lowest horizon of the 

 Cretaceous. In the Uinta range it was in reality the Eocene con- 

 glomerates, and not those of the lower Cretaceous, which we had 

 observed resting unconformably upon the upper shales of the Ju- 

 rassic, Continued delay in the publication of the geological vol- 

 umes of our series induces me now to make this correction. In the 

 case of the Uinta there is clearly no non-conformity, from the low- 

 est exposures of the Carboniferous to the highest Cretaceous 

 horizon, while the lowest Eocene rests upon the Cretaceous with 

 distinct non-conformity. 



In the Wahsatch the evidence is far more complicated. While 

 the post-Cretaceous disturbance clearly had its profound effect on 

 the range, there are also many facts which confirm our belief that 

 the close of the Jurassic also marked a period of orographical 

 activity, as it did in the Sierra Nevada. Clarence King. 



9. The trilobite, Ceraurus pleurexanthemus, of Trenton Falls, 

 New York. — Mr. C. D. Walcott has given an accoimt of the 

 mode of occurrence of this species and of the characters of the 

 under surface of the dorsal shell, in vol. xi of the Annals of the 



