TY  - JOUR
TI  - On the Structure of the Skull in the Elasmobranch Genus Didymodus
T2  - Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
VL  - 21
IS  - 116
UR  - https://www.biodiversitylibrary.org/part/213685
PB  - American Philosophical  Society
CY  - Philadelphia
PY  - 1884
SP  - 572
EP  - 590
AU  - Cope, E. D. (Edward Drinker),
ER  -