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PROCEEDINGS 
OF THE 
AMERICAN PHILOSOPHICAL SOCIETY, 
HELD AT PHILADELPHIA, FOR PROMOTING USRFUL KNOWLEDGE, 
VOL. XXI. 1884. No. 116, 
TABLE OF CONTENTS. 
PAGE. 
/ Synopsis of the Species of Oreodontide. By H. D. Cope (with plate). 508 
On the Structure of the Skull in the Elasmobranch genus Didymodus. 
By BD CGD ay avy slelnaie side eine is ales ure eniewnenalivs 0d sie'leiaia's eons O72 
Photodynamic Notes, No. IX. he Pliny Harte Chase ...e.vcoevves 590 
Stated Meeting, Jwne 20.... 0065 VV) RR OL 
Stated Meeting, July 18......+ Rue an 618 
Correction of Minutes of January 18. By #. D. Oope.........- wiewre GLO 
Notes on the Codex Ramirez, with a translation of the same. By 
OUND LEN UUUU ON EU's tuach \isieie Wee Ute ENNIS Cohth MW UATE y Veen weer GLO 
The Pennsylvania Prison System. By Richard Vaudi...ccccccecees 651 
Notes on the Stromateide. By Theodore Gill......... vesesovseeeees O04 
: Stated Meeting, AUGUat Lbs... ees ie neceesecs 672 
{ Stated Meeting, September 19...cecceesseevees B%4 
i. Thermometrical Observations in Quito, Ecuador. By @. B. Brock- 
\ WANs sss ee eie Ce bib e wlacebierdle Vieldyely be@ibly GIG OU bv isiwele'yn wibin’ 4 pole’ ee CLO 
A" Stated Meeting, Coneten fA Ore cin to 685 
On some Indian Picture Rocks in Fayette Co. By J. Sheth Wail. 687 
Stated Meeting, October 17....... eesees weve! O80 
Trap Dykes in the Archean Rocks of Southeastern Pennsylvania. 
j By Dr. Persifor Frazer... ccicceees RHEL uae Mer huNN is Mouser aioe 691 
On Herderite. By F. A, Genth.......0.005 RON Sfrimale shi ghiniee couih iy 694. 
Notes on the Natural Bridge of Virginia. By (0. A. Ashburner...... 699 
| Stated Meeting, November 7...... RE 700 
| Stated Meeting, November 21...... ee Gay 702 
ie Stated Meeting, December 5...... UNG Rau hades 705 
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