EXPLANATION OF PLATE XLVIIT. 



Fig. 1. Base of pectoral 6pine of Pelecoplerua chirurgus, displaying the stout (a, b) and slender (c, d, c) 

 basilar bones, with fossae for the inner ones; /, coraco-clavieular foramen. 



2. Base of pectoral spine of Pdecopterua 2>cririciosus ; lettering as in the preceding figure. 

 Figs. 3-8. Erwichthe nilida, Cope, probable maxillary, preinaxillary, and other bones. 

 FlG. 6. Distal end of dentary bone, from outside; a, from above. 



7. f Hvomandibular bone. 



