1 lO 
Coj)e — Sketch of Or. Hay den. 
of which are as yet undescribed. They are generally in a good 
state of preservation, and so far as observed, never silicified. 
Those of interest in this connection are: 
Stictofora mufabilis Ul. 
*' pauper a Ul. 
Pachydictya acuta Hall. 
Eurydictya multipara Hall's sp. 
Ceramoporella sp. (a) 
AtactoporcUa sp. (a) 
Prasopora lycopcrdon Van. 
(typical and very abundant. 
Dekayia frentonensis. Ul. 
Prtif^opora petrcliialis Nich. 
Alonolrypclla tnultitahulata Ul. 
BatoatuiiirUa f trriifoitcusi.'i Nich.sp. 
CamereUa n. sp. (a) 
Lingula ririniforniis Hall. 
" cohouri^^cHsis Bill. 
Bellerophon bilobatus Sowerby. 
Cyrtolites compress ua Conrad. 
Fusispira terebriformis Hall. 
Raphistoma lenticularis Hall. 
Murc/iisonia milleri Hall, (typical) 
tlolopea vcntricosa Hall. 
" leiosoma Bill. 
Pellinomya Icvata Hall. 
I^yrodrsma planum Conrad. 
Conchicolites ficxuosum Hall. 
Dalmanitcs callicephalus Green. 
(To be continued.) 
F. V. HAYDEN, M. D., LL. D. 
BY E. D. COPE. 
Ferdinand V. Ilayden, M. D,, Ph. D., the well-known geolo-^ 
gist, died December 23 at his residence in Philadelphia, after an 
illness which confined him to his room for over a vear and a 
half. 
He was born in Westfield, Mass., Sciotember 7, 1S29, and at 
an earl}' age emigrated to Ohio, and was graduated from Ober- 
lin College in 1850. He afterward studied medicine at the Al- 
bany Medical College, taking his degree in 1S53. He did not 
practice medicine, but in the spring of the year of his graduation 
visited the "bad lands" of Dakota on White river in the in- 
terest of Prof. James Hall, explored one of the remarkable an- 
cient deposits of extinct animals, and returned with a large and 
valuable collection of fossil vertebrates. He spent the three fol- 
lowing years in exploring the upper IVIissouri, and his large 
collection of fossils was partly given to the Academy of Sci- 
ences in St. Louis and a part to the Academy in Philadelphia. 
These collections attracted the attention of the officers of the 
Smithsonian Institution, and he was appointed, at the sugges- 
tion of general J. A. Logan, geologist on the staff of lieuten- 
ant G. K. Warren, of the U. S. topographical engineers, who wa.s 
then making a reconnoissance of the Northwest, and continued 
