210 Reviews— Canadian Naturalist and Geologist. 
which he proposes to divide the four great groups of Animals (Ver- 
tebrata, Articulata, Mollusca, and Radiata), according to their 
analogies, into four branches, to be called, 1. Nervous, 2. Motive, 
3. Nutritive, and, 4. Embryonic or Reproductive Class. Arranged 
in a tabular form, they serve to express the leading feature of the 
several divisions of each group of animals. Thus Birds, Insects, 
Snails, and Acalephs represent the four groups of the Motive 
class (2).—II. ‘On the Fossils of the Genus Rusophycus, by Dr. Daw- 
son. This genus was established by Prof. Hall for certain trans- 
versely wrinkled impressions found in rocks of the ‘ Clinton Group’ 
(Middle Silurian) of New York, and supposed to be fossil Sea-weeds. 
Similar objects are described by Mr. Billings from the Chazy Sand- 
stone of Grenville, Canada, &c. ‘These curious and irregular bodies, 
Dr. Dawson believes, may be casts of the impressions of the lami- 
nated gill-feet of Trilobites, and that they may have been connected 
with the place of incubation at the end of burrows.—III. ‘ Note on 
the Geology of Eastern New York,’ by Prof. Hall and Sir W. E. Logan, 
being the commencement of a comparison of Eastern New York with 
Eastern Canada.—lV. ‘ On the Geology of the Ottawa Valley,’ by 
J. A. Grant, M.D., F.G.S., &c. (being the extract of a Lecture 
delivered to the Ottawa Natural History Society). This consists 
of a description of the geological features of this valley, but it re- 
quires a map to render it intelligible to a stranger.—V. ‘ On Peat 
and its Uses,’ by Dr. T. Sterry Hunt, F.R.S. A description of the 
several Canadian peat-deposits, and the various processes which 
have been tried for producing from peat-oil, parafline, wood-naphtha, 
and sulphate of ammonia. ‘There are also numerous interesting and 
original Botanical papers. 
Memoirs oF THE GEOLOGICAL SURVEY OF GREAT BRITAIN. 
1. Mr. Green’s Memorr on parts of Oxfordshire, Bucks, and 
Northamptonshire, is a careful statement of the facts observed by 
him in the district surveyed, showing the grounds on which he has 
mapped its surface, mostly composed of Oolitic strata. Clear wood- 
cuts illustrate some of his points. Whether or not the geological 
results arrived at are in accordance with those held by others ex- 
perienced in the mysteries of the Oolitic rocks—their variableness, 
their homotaxeous difficulties, and such like,—at all events we have 
a clear and well-written Memoir of careful work. 
2. Mr. Drew’s Memoir on the Country between Folkestone and 
Rye, including Romney Marsh, is a succinct, clear, and instructive 
account of South-eastern England, of which little has been pub- 
lished since the days of Fitton and Mantell. Itis only by such 
close and long-continued examination as the Surveyors make, that 
the much-broken Wealden district, with its many-bedded shales 
and sands, can be disentangled and clearly mapped. One of the 
most interesting facts worked out by Mr. Drew is the up-coming 
of the ‘ Ashburnham Beds’ (lowest part of the ‘ Hastings Sands’) 
at Rye, where a deep Artesian boring traverses 330 feet of them, 
