NORTH AMERICAN INVERTEBRATE PALAEONTOLOGY. 5G5 



Claypole, E. W. — On the occurreuce of the Genus Balmanites ju the 

 Lower Carboniferous Rocks of Ohio. (Geol. Magazine, 3(1 Decade, 

 July, 1884, vol. i, No. vii, pp. 303, 307, London.) 

 The author describes Dalmanites'i Cuyahogw, illustrated by a wood- 

 cut, and he discusses the Trilobitic fauna of the carboniferous. 



DwiGHT, William 1>. — llecent Explorations in the Wappinger Valley 



Limestone of Dutchess County, New York, No. 4. 

 Descriptions of Calciferous ? Fossils. (Araer. Journ. of Sci. and Arts, 



April, 1884, vol. xxvii, article xxix, pp. 249-259, pi. vii, New Haven, 



]884.) 



The figures are clear. TJie new species described are as follows: 

 Bathyunis taurifrons, B. ? crotalifrons, Gyrtoceras vassarina, G. ? dac- 

 tyloides, G. microscopicum, Orthoceras spissiseptum, 0. Henrietta, and On- 

 coceras rasiforme. 



FoEKSTE, Aug. F.— The Power of Motion in Crinoid Stems (January. 



1884). (Amer. Naturalist, vol. xviii. No. 1, pp. 57, 58; figure in text, 



Philadelphia, 1884.) 



The author, froui the fact that he found a crinoid stem disposed in a 

 perfect natural coil, argues that it placed itself in that position, was de- 

 stroyed while in that position, and must have had the power of motion 

 to place itself in that position. 



Fontaine, W. M. — Contributions to the Knowledge of the older Meso- 

 zoic Flora of Virginia. Monographs of the United States Geological 

 Survey, vol. vi, pp. 1-144, pis. i-liv. 4to. Washington, 1883. [Ap- 

 ])eared December, 1884.] 



This work is divided into three parts. In the first Professor Fontaine 

 gives a brief description of the geology of the Virginia Mesozoic areas. 

 Tn the second he describes the flora, among it the two new genera, Mer- 

 tensides n. g. and Paeudodanwopsis n. g., and twenty-seven new species: 

 Schizoneura virginiensis, Acrostichides rhomhifoUus, A. microphyllus, A. 

 densifolins. Mertensides distans, Asterocarpus virginiensis, A. platyracMs^ 

 A.pentimrpa., Pecopteris rarinervis, Gladophlehissiihfalcata, G. auricnlata, 

 G. ovata, G. microphylla, G. pseudotchithiensis, G. rotnndiloba, Lonchop- 

 teris virginiensis, Pseudodanceopsis reticnlata, P. nervosa, PetrophyUum in- 

 wquale, Gtenophylhmi trnncatum, G. grandifolinm, G. giganteum, Podo- 

 zamitcs emmonsi, Sphenozamitcs rogersianus, Gycadites tenuinervis, Zamio- 

 strohus virginiensis, Baiera multijida. 



A table comparing them with plants from the Triassac, Jurassic, and 

 Eh;ietic of other regions is given; 9 per cent, show aflSnities with Tri- 

 assic forms, 19 per cent, with Jurassic forms, and 28 per cent, with 

 Khsetic forms. The flora must therefore be considered not older than 

 the Rhtetic. 



In the third part he republishes Emmqiis's figures of the Mesozoic flora 



