276 Progress of Invertebrate Paleontology in [ April, 
article for publication in the Proceedings of the Academy “On 
some new Lower Eocene Mollusca from Clark county, Alabama, 
with some points as to the stratigraphical position of the beds con- 
taining them.” Professor Heilprin has also completed the prepara- 
tion of a “ Revision of the Eocene Mollusca of the Eastern and 
Southern United States,” which, when published, will constitute 
a much needed addition to our palzontological literature. 
Mr. S. A. Miller has continued his publications in the Journal 
of the Cincinnati Society of Natural History during the past year. 
He began a series of articles, mainly historical, in the October, 
1879, number of the Journal, entitled “ North American Mesozoic 
and Cenozoic Geology and Palzontology,” which he has contin- 
ued in each subsequent number to that of January, 1881. He in- 
forms me that it will be completed in the next April number, and 
that the whole series will embrace upwards of three hundred 
pages. In the January, 1880, number, Mr, Miller has three. 
palzontological articles, entitled respectively, “Silurian Ichnolites, 
with definitions of new genera and species ;” “Descriptions of 
two new species from the Niagara group and five from the Keo- — 
kuk group;” and Note upon the habits of some fossil Annelids ; 
the two first mentioned being illustrated. In the first named of 
these three articles he proposes six new generic names for as 
many different kinds of tracks which he has found upon the Lower 
Silurian slaty shales near Cincinnati. The July and October, 
1880, number, and the January, 1881, number of the Journal, each 
contains an illustrated paleontological article from his pen, en- 
titled respectively, “‘ Description of four new species of Silurian fos- 
sils;” “ Description of four new species and one variety of Silurian 
fossils ;” and “ Description of five new species of Silurian fossils, 
and remarks upon an undetermined form.” Mr. Miller has also_ 
completed the MS. of catalogue of the North American Mesozoic 
and Cenozoic fossils, upon the same general plan of his catalogue 
of Palzozoic fossils published a few years ago, whish he hopes 
soon to publish, 
Professor A. S. Packard, Jr., in the July, 1880, number of the 
AMERICAN NATURALIST, has an instructive illustrated article on 
“The structure of the aye of Trilobites.” In concluding this article 
Professor Packard says, “I now feel authorized in claiming that the 
Trilobite’s eye was organized on the same plan as that of the 
Limulus, and thus when we add the close resemblance in the 
