280 Reviews—Fawna of the Batesville Sandstone. 
treatment. In the case of coal the theory is proposed that the 
various stages between plant beds and anthracite are due to a com- 
bination of an increasing amount of pressure and the heat developed 
by the pressure, but this theory—as pointed out by the authors— 
cannot be said to be universally accepted. In this country, for 
example, it has been shown that the anthracites of South Wales are 
mainly due to original differences in composition and bear little 
relation to the earth-movements that have given the coalfield its 
structure." 
In the concluding chapter, on Historical Geology, we have a concise 
account of North American stratigraphy. 
One of the chief defects of an otherwise admirable book is the 
small space allotted to geological mapsand sections. Lack of detailed 
knowledge of stratigraphy we can understand, but a civil engineer 
should be able to interpret nearly every geological map set before 
him, and this would be almost impossible if he had to rely upon 
the scant details presented in some five pages of text. As regards 
geological sections, some of the authors’ are badly drawn, such as 
figs. 97 and 98, whilst the section, fig. 116, is impossible. 
demahs 5 
IV.—Fauna or tHe BaresvitteE Sanpsrone or NortHEeRN ARKANSAS. 
By Grorce H. Grety. Bulletin 593, Department of the Interior, 
United States Geological Survey (George Otis Smith, Director), 
1915. pp. 170, pls. i—x1. 
‘{\HIS is a companion work to that on the ‘‘ Wewoka Formation ”’, 
issued by the author a few months since, which was noticed 
in the Gzorogican Magazine for 1915, p. 569, and deals similarly 
with Carboniferous invertebrates. The Batesville Sandstone is con- 
sidered to favour a correlation with the Cypress Sandstone and the 
Ste. Genevieve Limestone, which belong to the later Mississippi Series 
of the older Carboniferous formation. The fauna is characterized by 
an abundance of Cephalopoda, large Pelecypods, comparatively few 
Brachiopoda, besidesmany Bryozoa. In all 128 species are described 
and. mostly figured, as against 30 species discussed from the same 
beds by Professor Weller in 1898 (Trans. New York Acad. Sci., 
vol. xvi). These species are represented under the following groups 
and genera:—Foraminifera: Zrochammina, Endothyra. Coelenterata: 
Zaphrentis. Helmintha: Spirorbis. Bryozoa:  Batostomelia, 
Lioclema, Tabulipora, Cystodictya, Glyptopora, Fenestella, Polypora, 
Archimedes, Rhopalonaria. Brachiopoda: Lingulidiscina, Cranta, 
Schuchertella, Orthotetes, Productella, Productus, Diaphragmus, 
Camarotechia, Dielasma, Girtyella, Spirifer, Reticularia, Spirvferina, 
Clyothyridinia, Composita, Eumetria. .Pelecypoda: Sphenotus, 
Edmondia, Nucula, Leda, Yoidia, Sulcatipinna, Leptodesma, Cono- 
cardium, Caneyella, Myalina, Schizodus, Deltopecten, Myoconcha, 
Lithophagus, Allorisma, Oypricardella. Scaphopoda: Levidentalium. 
Gastropoda: Lepetopsis, Pleurotomaria, Euconospira, Bembexia(?), 
1 Coals of South Wales (Mem. Geol. Surv.), 1908; 2nd ed., 1915. 
