ANNIVERSARY ADDRESS OF THE PRESIDENT. 55 
being the homologue of the Dinosaurian prepubis, does not destroy 
it ; since in these latter the pubic component of the tubercle may 
grow and largely increase, the ischiatic element not augmenting, 
until the latter is ultimately absolutely dominated by the former, 
and that which in its origin was dual, finally appears to be, and is, 
wholly composed of an outgrowth of the pubis alone, and the ilio- 
pubic tubercle becomes a pubic tubercle. Now something of this 
kind can be traced out in those singularly reptile-like Monotremes, 
the Hchidna (fig. 6) and Ornithorhynchus (fig. 7). And I have 
Fig. 6.—Pelvis of Echidna. (After Wiedersheim. ) 
a. Ilium. ts. Ischium. p. Pubis. m. Marsupial bone. 
tip. Tuberculum ilio-pubicum. 
thought that the horn-shaped process which juts out from the 
front border of the os pubis in Chelonia (Testudo, fig. 8) may have 
a similar origin, and that here, in a living reptile, we find the mor- 
phological equivalent of the prepubis of the extinct Ornithopoda. 
I have already, in treating of the presymphysial bone, incidentally 
referred to one of the latest additions to our knowledge of cranial 
structure in Dinosaurians, Prof. Cope’s paper ‘“‘ On the Characters of 
the Skull in Hadrosauride.” The description and figures of the 
skull of Diclonius mirabilis show that it had a skull in form “a 
good deal like that of a goose.” Hach maxillary bone contained 
630 teeth, and each splenial 406 teeth, giving a grand total of 2072 
teeth. Its dentition is so remarkable and so unique, and these 
details of construction are so singular, that I hope no long time will 
elapse before a fully descriptive and copiously illustrated memoir 
upon it will appear. 
In my address last year I alluded to the remarkable works 
