Reviews—Hall’s Paleontology of New York. 521 
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T.—Somrm Dervontan AND Srturtan Fosstrs or Norta AMERICA. 
By James Hat and J. M. Cuarxe. 
N continuation of the grand series of monographs on the Natural 
History of the State of New York, prepared by eminent 
naturalists and geologists, and issued from time to time at the expense 
of the State, we have lately received a handsome instalment. This 
is a thick quarto volume, entitled :— 
“Geological Survey of the State of New York. Paleontology : 
Vol. VII. Text and Plates. Containing descriptions of the Trilo- 
bites and other Crustacea of the Oriskany, Upper Helderberg, 
Hamilton, Portage, Chemung, and Catskill Groups. By James Hall, 
State Geologist and Palzontologist. Assisted by John M. Clarke.” 
4to. Ixiv. and 256 pages, and 45 plates. Together with a 
“Supplement to Vol. V. Part 2, of the Paleontology of New-York 
State. Pteropoda, Cephalopoda, and Annelida;” 42 pages, and 
plates 114 to 129. Albany, N. Y., 1888. 
This is a most valuable contribution to our knowledge of the 
paleontology, chiefly of the Devonian rocks of the State of New 
York; and is a large addition to the extensive series of State 
publications, which the veteran Professor Hall has already produced 
in Albany, N.Y., with the aid of the State Museum of Natural History. 
In the preparation of the important volume before us, Dr. James 
Hall states, in the preface, that he has to acknowledge with great 
Satisfaction the able and untiring efforts of his Assistant, Mr. John 
M. Clarke, both in the preparation of the matter for the press, and in 
the critical study of the material. With such fossils Mr. Clarke’s 
long-continued researches have made him well acquainted, as shown 
to a great extent by his previous memoirs. 
A study of the descriptions and figures of the Trilobites, forming 
the first 152 pages and 34 plates, particularly impress us with the 
fact of a close similarity of the North-American Devonian forms to 
those of Europe. Many of the genera, as Calymene, Homalonotus, 
Phacops, Dalmanites, Lichas, and Proétus suggest to some extent an 
Upper-Silurian facies, as found in this country ; and some, as Phacops 
and certain forms of Proétus, seem to be closely related to the 
Devonian species of the Eifel. 
Attention is arrested by such species here figured as Dalmanites 
regalis, in which the front border is ornamented with a symmetrical 
denticulation, consisting of distinct, subquadrate, tooth-like processes, 
resembling the cog-wheels of a clock. These are shown in 
Dalmanites Aigeria to have united one to the other along the outer 
margin, leaving hollows between their bases. Such a structure is 
seen also in T’rinucleus, as figured and explained by the late J. W. 
Salter and Dr. H. Woodward. 
Some of the figures given of Homalonotus, Dalmanites, and Lichas 
admirably convey the idea of the great size attained by several of 
the species, and of the rich and grotesque ornamentation frequently 
present. 
