1887 | Mineralogy and Petrography. 1109 
1858, Zaxocrinus multibrachiatus Lyon and Cassiday (labelled 
i mer. collections Forbestocrinus meeki Hall). 
Amer. Journ. Sci., vol. xiii. 
1861. Vaxocrinus lyoni Hall (Cyathocrinus lyoni) Meek and Wor- 
_ then. 1868 (Barycrinus lyoni). Proc. Acad. Nat. Sci. 
Phil. Syn. Cyathocrinus hexadactylus—Chas. S. Beach- 
ler. 
The Carboniferous Genus Stereosternum.—The reception of 
a nearly entire specimen of the remarkable reptile Stereosternum 
tumidum Cope, from San Paolo, Brazil, through Professor Or- 
ville Derby, enables me to add a number of characters to those 
already known. The sternal region presents a large coracoid 
on each side posteriorly, and a transverse element anteriorly. 
Whether the latter is clavicle or the transverse limbs of a large 
interclavicle, is uncertain. The foramen of the humerus is er- 
the ectepicondylar 
membered.—£. D. Cope 
MINERALOGY AND PETROGRAPHY.* 
teries locked up in the depths of rock-masses, and must examine 
geologist, but of 
them with the critical eyes not merely of ice th fr ania 
“e chemist and physicist as well. We oo Mme, 
* Edited by Dr. W. S. BAYLEY, Madison, | 
2 Miner. u. Petrog. Mitth., vili., 1857, p 4 
