Reviews — Geology of Illinois. 427 



by his able Eeport (in vol. ii.) on the Fossil Plants of Illinois, 

 occupying 40 pages of letterpress and illustrated by 17 well-executed 

 plates. In the same volume are descriptions of the Vertebrata by 

 Messrs. J. S. Newberry and A. H. Worthen ; and of the Invertehrata 

 by Messrs. F. B. Meek and A. H. Worthen. 



Among the EcJiinodermata, as might be expected from the known 

 richness of this region, are many new and remarkable forms. There 

 is a most wonderful Crinoid ; placed near the Gilbertsocrinus of 

 Phillips, and named Goniasteroidocrinus {=Trematocrinus of Hall), 

 certainly the most anomalous form of Crinoid (if such it be) which 

 we have seen. In addition to five bifurcated processes (supposed 

 by Phillips and others to be the arms), it appears to have true arms 

 superadded to these, placed in the interspaces between the five thick 

 bifurcated arms, which are considered to be equivalent to the side- 

 branches of the column of Pentacrinus. Many new forms of 

 Crustacea, Araclinida, and Myriapoda, are added to the fauna of the 

 Coal-period, they include Eurypterus Mazonensis, M. and W. from 

 Mazon Creek, G-rundy Co. Illinois ; a new Limidus [Bellinurus 

 Dance), a new Macruran Decapod (^Anthrapalcemon gracilis) ; Palao- 

 caris typus (referred by Messrs. Meek and Worthen to the Decapoda- 

 Macrura, but resembling more nearly the Isopoda-aherrantia) , one 

 of those debateable forms which, like Gampsonyx jimhriatus, from 

 the Permian of Saarbruck, can only be explained on the Darwinian 

 hypothesis. Acanthotelson Stimpsoni, M. and W. and A. Event, M. 

 and W. two admitted species of Isopods. 



Among the Bivalved Entomostraca, Ceratiocaris ? sinuatus M. and 

 W., and Leaia tricarinata, M. and W. may be mentioned. 



In the Myriapoda, Euphoheria armigera M. and W., a huge Centi- 

 pede, and E. major, M. and W., even larger. 



Eoscorpius carhonarius, M. and W., a new Coal-measure, Scorpion 

 and Mazonia Woodiana, M. and W., a still more interesting form of 

 Arachnide. 



Several species of true Insects : Miamia Dance, Chrestotes lapidea, 

 Mantis, ? Megantlientonmm pustulatum, Eupliemerites simplex, E. gigas, 

 and E. affinis, have been identified by Mr. Samuel H. Scudder, of 

 Boston, from the Coal-measures of Illinois. 



We cannot do justice in our limited space to this admirable 

 Eeport, nor give any detailed account of the careful way in which, 

 county by county, the region has been traversed and worked out by 

 Mr. Worthen and his colleagues. 



Numerous maps, sections, plates, and woodcuts, illustrate both 

 the Geology and Palajontology of the State, and reflect the highest 

 credit on the artists and draughtsmen employed in their execution. 



GrEOLOGicAL ExcuKSiON TO HuNSTANTON. — The members of the 

 Geologists' Association, accompanied by Professor J. Morris, F.G.S., 

 visited Hunstanton, Norfolk, on August 2nd, for the purpose of ex- 

 amining the interesting geological features of this locality. 



