226 
Reviews — The P alceontographical Society. 
1. Dr. Wright gives part 6th of vol. i. of the Cretaceous Echino- 
derms, especially of the genera Cottaldici, Discoidca, and Echinoconus. 
In treatiug of the “ Echinoidea exocyclica,” the author takes great 
care to define the seven groups in which Breynius, one of the first 
and best of early Ecbinodermatologists, arranged the Echinidae, with 
the synonyms nsed by others ; and he gives a translation of the 
rare “ Schediasma de Echinis,” etc., frorn Breynius’s “ Dissertatio 
physica,” etc., 1732. 
2. Mr. Davidson adds to his immense collection of Brachiopodal 
literature and iconography some valuable supplemental notes, de- 
scriptions, and figures of Tertiary and Cretaceous species, either new 
or not sufficiently well known. 
This enthusiastic student of Brachiopodal life-forms, liaving liim- 
self drawn on stone for the Society upwards of 200 quarto plates, 
often crowded with good figures, has thus enabled the Society to 
expend considerable sums on the illustration of other subjects, 
which would eise have waited, perhaps in vain, for costly figuring. 
3. Mr. S. Y. Wood, the veteran geologist of the Crag, contributes 
a Supplement to his monographic account of the Bivalves of the 
Crag (and this Supplement is a monograph of itself. with 5 plates), 
some concluding remarks on the distribution of the Crag fauna, and 
an admirable “ Synoptical List of Marine Mollusca from the Upper 
Tertiaries of the East of England,” with remarks and an analysis of 
the list. The stratal grouping adopted 1 is (downwards) : 
Post-Glacial ; Valley Gravel, and Upland and Lowland 
Brick-earths. 
Gravel* ) f >ost ‘^ ac ' a ^> anc * Glacial (?). 
Upper Glacial; the great Chalky Boulder-clay. 
Middle Glacial; Sand and Gravel. 
T ,,, . , | The Contorted Drift. 
Lower Glacial { The ?ebbly Sand and p e bble-beds. 
Chillesford Beds ; Clay and Sand. 
Fluvio-marine Beds. 
p , ( Red Crag, excepting the Scrobicularia-beds above, and 
Red l the Walton Crag below. 
Crag. ( Older or Walton Red Crag. 
Coralline Crag. 
Glacial 
Beds. 
Upper 
Crag. 
Lower or 
White Crag. 
“ The results of the Table indicate,’’ writes the author, p. 220, “an almost identical 
per-centage of forms not known as living in the case of the older Red Crag and the 
Coralline, which is in eonflict with the geological break, which I still believe to exist 
between the two formations. With the exception of the Middle Glacial column of it, 
however, the Table shows very forcibly the dirainishing Mediterranean aspect of the 
fauna as we ascend in the geological scale. In the Coralline Crag there are fifty-two 
Mediterranean forms not living in the British seas, and only twenty of the converse 
character ; and of these twenty, two, viz. Odostumia Guhonm and Psammobia 
tellinelln, are I.usitanian. In the Walton Red Crag the respective numbers are 
fourteen and thirteen ; hut in the rest of the Red Crag the British species not living 
in the Mediteranean are in number more than double those of the converse character; 
wliile in the Fluvio-marine Crag these proportions are increased five-fold ; and in 
the Chillesford beds nineteen-fold. In the Lower Glacial there occur thirteen, in 
the Upper Glacial twenty-one, and in the Post-Glacial nineteen British species un- 
1 See also the Introduction to this Supplement, Part 1, 1872, by S. V. Wood, Jun., 
F.G.S., and F. W. Harmer, F.G.S. 
