-1881.] the United States for the year 1880. | 277 
_larval forms, in the general anatomy of the body-segments, and 
the fact demonstrated by Mr. Walcott that the Trilobites had 
jointed, round limbs (and probably membranous ones), we are led: 
to believe that the two groups of Merostomata and Trilobites are 
sub-divisions or orders of one and the same sub-class of Crustacea 
for which we have previously proposed the term Pa/@ocarida.” 
In his memoir on the Anatomy and Embryology of Limulus, he 
also makes direct structural comparisons of the eyes of Trilobites 
and Limulus. 
Mr, Samuel H. Scudder has published in the Bulletin of the 
Harvard College Library two installments of his Bibliography of 
Fossil Insects, and a third installment will soon be out. He ha 
also completed a memoir on the Devonian Insects of New Bruns- 
wick for the Boston Society of Natural History, the general con- 
clusions of which have appeared in the form of an article in the 
American Fournal of Science for February. Besides these works 
he has in hand a paper on the geology and palzontology of Floris- 
sante, Colorado; and another on the structure and affinities of 
Euphorberia M. & W. 
Advance sheets of two posthumous articles by the late Wm. 
M. Gabb, edited by Geo: W. Tryon, Jr., have lately been issued 
by the Acad. Nat. Sci. Philadelphia. They are entitled respec- 
tively, “ Descriptions of Caribbean Miocene Fossils, and “ De-. 
Scriptions of New Species of Fossils from the Pliocene clay beds 
between Limon and Moen, Costa Rica, together with notes on 
previously known species from there and elsewhere in the Carib- 
bean area.” They comprise together pp. 337-380, and plates 
44-47, inclusive, of the Jour. Acad. Nat. Sci. Philad. (2). Vol. 
vill. In the latter paper Mr. Gabb has proposed the new generic 
name of Parkeria for a group of gastropods (not Parkeria Car- 
penter and Brady, a genus of Foraminifera). 
Lieut. A. W. Vogdes published in the Proc. Acad. Nat. Sci. 
Philad. for 1880, p. 176,:“ Description of a new Crustacean, Caly- 
mene rostrata, from the Upper Silurian of Georgia, with remarks 
upon Calyméne clintont.” Four wood-cuts. 
Messrs. Wachsmuth and Springer have in press the second 
part of their Revision of the Palzocrinoidea, and also a supple- 
ment to the first part. It is the intention of the authors to com- 
plete this important work as soon as practicable. . 
Mr. C. D. Walcott has been long absent upon distant field” 
