1918] The Ottawa Naturalist. 139 



Although a comparison of Trachodon mirabilis Leidy, (repre- 

 sented by a single tooth) with Diclonius mirabilis Cope, (known from 

 the complete skeleton) is necessarily limited, it is clear that the 

 two forms are not conspecific, the pointed tooth of the former differ- 

 ing in a marked degree from the teeth of the latter with apices 

 rounded in lateral outline as figured by Cope. It is difficult, if not 

 impossible, to arrive at any conclusion regarding their generic rela- 

 tionship, but it is highly probable, in view of their difference in 

 geological age, that they are not congeneric. It is considered best, 

 therefore, under the circumstances, to retain the generic term Diclon- 

 ius in association with the Lance species which has been so long 

 known to palaeontologists generally as Diclonius mirabilis of Cope. 



The genus Claosaurus was established by Marsh in 1890 on 

 the remains of a small hadrosaur, from the Niobrara of Kansas, 

 which had been described by him in 1872 under the name Hadro- 

 saurus agilis. There were available for comparison the more im- 

 portant portions of the skeleton, but no parts of the skull except teeth 

 were obtained. To this genus Marsh later assigned a species, from 

 the Lance formation of Wyoming, which he described, from com- 

 prehensive material (including the skull) as C. annectens. 



That Marsh was wrong in referring his Wyoming species to so 

 early a genus as Claosaurus is most probable. That the species 

 belongs to the genus Hadrosaurus is unlikely. The genus Trachodon, 

 to which this species is sometimes assigned, is not definable and 

 therefore cannot be properly used for its reception. 



The species annectens of Marsh comes under the sub-family 

 Hadrosaurinae and probably belongs to an unnamed genus. For 

 the purpose, however, of this paper the generic term Claosaurus is 

 made use of to receive it. 



Dr. C. W. Gilmore, writing in 1910 1 " on the genus Trachodon, 

 concludes, in part, that "the use of the term Trachodon should be 

 restricted in its application to some one of the trachodonts found 

 in the older beds" (Belly River, Judith River, etc.). To which 

 then of the several at present known Belly River genera could the term 

 Trachodon be applied? 



BRIEF NOTES ON THE PREVALENCE OF CERTAIN BIRDS 



IN BRITISH COLUMBIA. 



By Allen Brooks, 



Major, British Expeditionary Force, France. 



Band-tailed Pigeons (Columbia fasciata Say) Very few of 



these are killed in B. C. The depletion must cojpae^ ^their winter 



quarters. 



"Science, new seric-.s, vol. XLI. p. 658. 



