34 
of the present manuscript that independently he had arrived at the same 
conclusion, and in an article then submitted for publication had proposed 
the name Lambeosaurus lambei for the reception of the referred skulls. The 
better preserved specimen, No. 2869, Geol. Surv., Can., had been selected 
by him as the type of this new genus and species. Since the discussion by 
Parks obviously rests on information largely gleaned from the literature, 
the present more detailed and critical study of the typical specimens, 
together with a complete description of the type of Lambeosaurus , appears 
worthy of publication with but little change from the form in which it was 
originally prepared. 
In view of the several nomenclatural changes proposed in the present 
paper a list of the recognized genera and species of Canadian hadrosaurian 
dinosauria is appended in order to show their assignment in the classifica- 
tion of the Hadrosaurid® as here adopted. 
Family, Hadrosaurid^e 1 Cope, 1869 
Sub-family, Hadrosaurince Lambe, 1918 
Belly River Formation 
Kritosaurm marginatus (Lambe), 1902 
“ notabilis (Lambe), 1914 
“ incurvimanus Parks, 1919 
Edmonton Formation 
Edmontosaurus regalia Lambe, 1917 
Theapeaiua edmontoni Gilmore, 1923 
Sub-family, Saurolophince Brown, 1914 
Belly River Formation 
Pro8aurolophus maximua Brown, 1916 
Edmonton Formation 
Saurolophw osborni Brown, 1912 
Sub-family, Lambeosaurinoe Parks, 1923 
Belly River Formation 
Corythosauru8 casuariw Brown, 1914 
“ excavatus Gilmore, 1923 
“ intermedius Parks, 1923 
Lambeosaurus lambei Parks, 1923 
Paraaaurolophus walkeri Parks, 1922 
Edmonton Formation 
Hypaerosaurus altispinus Brown, 1913 
Cheneosaurus tolmanensis Lambe, 1917 
J The family name Hadrosaurid® was not proposed by Lambe, as Parks has inferred (Toronto 
Univ. Studies, No. 11, 1920, p. 8), but by Cope, and as shown by Lambe (Ottawa Naturalist, vol. 
33, 1918, p. 137), clearly has priority over Trachodontid® of Lydekker, 1888. Since at this time 
it is impossible to determine whether the genus Trachodon belongs to the crested or non-crested 
forms, I see no good reason for the proposed retention of the sub-family name Trachodontin® (Brown, 
1914) instead of Hadrosaurin® (Lambe, 1918), which in all probability, as shown by the non-footed 
ischium, is a non-crested form. 
