360 The American Geologist. May, 1893 
stratigraphic distribution of all the species. The work really affords 
a useful condensed manual of the actual Paris basin according to the 
most recent views without attempting to make correlations with English 
localities. It would be a reasonable sequel to this work if the authors should 
continue their study so as to warrant ihem in indicating the English 
and, if possible, the American parallels of the strata of theParis basin. 
Notes on the Correlation table of British and continental Tertiary strata. 
George F. Harris. (Extracted from Newton's "Systematic list of 
the Frederick E. Edwards collection in the British Museum,'" London, 
1891.) The table itself is "An approximate correlation of the Tertiary 
beds of Europe" — an outgrowth or accompaniment of the work above 
reviewed. The "Notes" call attention to and reproduce various other 
classifications, viz.: that of Mayer-Eymar in 1884; those of Dollfus of 
1875, 1877 and 1889 : Gosselet in 1888; Prestwich in 1888; and of Stremm, 
Meig, and Bertrand & Kilian in 1888. 
A revision of the British fossil Cainozoic Echinoidea. J. Walter 
Gregory. (Proceedings of the Geologists' Association, Vol. XII, Xos. 
1 and 2, Julv, 1891.) 
The author brings to bear on his results a study of all available col- 
lections, public and private. Under each species he gives "the present 
resting place of its type specimen," and adds a general account of the 
collections in the various museums. He adds five foreign species to the 
English fauna, describes eight new species, two of them belonging to 
genera new to the British area, discards six English species as syno- 
nyms, and suggests, (1) that the London clay echinoids are dwarfed 
subtropical forms, (2) that the lower Eocene echinoids are more allied 
to the lower than the upper chalk, (3) that some connection must have 
been established between the British sea and that of the Mediterranean 
basin in the middle, and perhaps upper, Eocenes, and (4) that the most 
striking feature in the Crag echinoid fauna is that it is of twofold ori- 
gin: since in addition to the ordinary North Atlantic forms it contains a 
series of genera found in the Mexican and Antillean regions, or of 
species most closely allied to these, which testifies of some direct con- 
nection of warm, shallow sea, and probably points to the past existence 
of at least a ridge or chain of islands across the southern part of the 
North Atlantic. 
CORRESPO:S;DE^OE. 
The Older Drift in the Delaware Valley. In the March num- 
ber of the Geologist professor A. A. Wright makes some statements 
concerning the older drift of the Delaware valley to which I should like 
to respond briefly, going back to the time his original paper on the sub- 
ject was presented, as well as one by professor G. F. Wright bearing 
on the same question. 
This was at Rochester, in August, 1892. On that occasion I was 
much surprised to learn that professor G. F. Wright (whose paper was 
