Arete A lat Seah i ee 
Mineralogy and Geology. 395 
cellent figures, both of the typical Belinurus and the new genus Prest- 
wichia. From these figures and the accompanying remarks, it bec 
specimens figured by Prestwich, really exist, and consequently forbid the 
reference of our species to this new genus, As it also differs upon quite 
characters from the genus Belinurus, as now restricted and 
clearly illustrated by Mr. Woodward, it becomes necessary to propose for 
its reception a third genus, holding a somewhat intermediate position 
between Belinurus and Prestwichia. 
For this new genus I would propose the name Huproops, in allusion to 
the anterior position of its eyes. This form is at once distinguished from 
the restricted genus Belinurus, by its anchylosed abdominal segments, 
and the anterior position of its eyes, as well as by the more oval or sub- 
circular outline of its abdomen. From Prestwichia, with which it more 
nearly agrees in general form, us well as in its anchylosed segments, it 
differs remarkably in having the area enclosed by its eye-ridge (glabella) 
comparatively small, and of a quadrangular form, with the eyes situated 
far forward at its anterior Jateral angles. On comparing these characters 
of the central region of its head with the corresponding parts of Prest- 
wichia, as illustrated by Mr. Woodward, it will be seen that the latter 
differs in having the glabella proportionately much larger, and trans- 
versely elliptic in outline, with the eyes widely separated and placed far 
‘back at its lateral extremities. It also has within this large elliptic area 
a smaller crown-shaped one not seen in Huproops, but corresponding in 
Size and general appearance with that bearing the eyes at its anterior 
lateral angles in the latter type. 
March 29th, 1867. 
2. Geological Survey of Illinois, A. H. Worruen, Director. Volume 
II, Paleontology, xix, and 470 pp., royal 8vo, with 50 plates and 30 
wood-cuts. Springfield, 1866. Published by authority of the Legislature 
of Illinois——This important and beautifully illustrated work, consists, be- 
sides the Introduction, of three Sections, as follows: 
Section I.—* riptions of new speciesof Vertebrates, mainly from 
on Subcarboniferous limestones and Coal Measures. By J. S. Newserry 
and A, H 
“Remarks on the occurrence of Fossil Fishes in Illinois. By A. H. 
Worrnen. 
“Supplement to descriptions of Vertebrates, consisting of a description 
of a new genus, and species of Reptiles from the Coal-measures. By 
Prof. Epw. D. Copz. — 
Section II.—* Descriptions of Invertebrates from the Carboniferous 
system. By F. B, Mex and A. H. Worrnen. ee 
By H. A. Prov, M.D. 
is. By Lro 
