278 Progress of Invertebrate Paleontology in [ April, 
duties, but he is known to have, in an advanced state of progress, | 
some important investigations concerning the structure of Trilo- 
bites. 
Professor A. G. Wetherby has continued his publications in the 
Jour. Cin. Soc. Nat. Hist. during the past year. In the January, 
1880, number, he has an illustrated article entitled, ‘‘ Descriptions 
of new Crinoids from the Cincinnati group of the Lower Silurian 
and the Subcarboniferous of Kentucky.” Also in the July, 1880, 
number, “ Remarks on the Trenton limestone of Kentucky, with 
descriptions of new Fossils from that formation and tlie Kaskas- 
kia (Chester) group, Subcarboniferous ;” likewise illustrated. In 
the last-named article Professor Wetherby proposes the new 
genus Hybocystites. The January, 1881, number of the same 
journal contains another illustrated article from his pen, entitled 
“ Description of Crinoids from the Upper Carboniferous of Pulaski 
county, Kentucky.” Besides these published articles, Professor 
Wetherby has two or three others in a forward state of progress. 
In the June, 1880, number of the American Fournal of Science, 
Professor R. P. Whitfield has an article “On the occurrence of 
true Lingula in the Trenton limestones,” illustrated by two wood- 
cuts. His remarks are based upon a new species from Minnesota, 
which he calls Z. e/deri, In the Annual Report of the Wisconsin 
Geological Survey for 1880, pp. 44-71, he has published “ De- 
scriptions of new species of Fossils from the Paleozoic formations 
of Wisconsin.” He herein proposes a new generic designation for 
a group of corals which he states to be in all respects compound 
Cystophyllia, under the name of Cystostylus. 
Professor H. S. Williams has an interesting article in the 
December, 1880, number of the Avmerican Yournal of Science, 
entitled “ Abstract of some palzontological studies of the Life 
History of Spirifer /evis Hall,” upon a subject which may be 
properly designated synthetic paleontology. In this article 
Professor Williams traces a series of forms of Spirifer, which 
are known in different formations by different specific names, 
through the strata of all the formations, from the Niagara to 
the Chemung, inclusive, and says of these groups of shells: 
“ There is nothing of a specific character evolved in this series 
of forms which did not appear in the first forms; but there is 
every evidence for the belief that the species has lived through 
this long geological time without losing its character, and that all 
