ON A SUPPOSED NEW SPECIES OF NOTOTHERIUM. 



By C. W. De Vis, M.A. 



For some time it has appeared with increasing probability that 

 the series of Nototheroid jaws forming part of the Queensland 

 collection includes representatives of a Nototherium distinct from 

 N. mitcJielli, Ow., distinct also from N. mermis, Ow., a species which 

 has not as yet been met with by the collectors or friends of the 

 Museum. The suspicion originally based on the very backward 

 position of the inlet of the dental canal in a mandibular fragment, 

 was partially confii-med by a mandible retaining one of its premo- 

 lars ; but this tooth was ground down almost to its base, and al- 

 though it presented appearances irreconcileable with those which 

 would probably be yielded by a premolar of N .mitchelli (as identified 

 by Sir E.. Owen) similarly abraded, it did not, or rather could not, va. 

 such condition inspire full confidence in its distinctiveness. All 

 such ground for hesitation has however been removed by the 

 the acquisition of a lately adult jaw in which the premolar is well 

 preserved ; the specific differences displayed by it are obvious, 

 and may be allowed to determine the presence of a third species 

 in the drifts of the Darling Downs, for which may be proposed 

 the name, if an excusable one, 



Nototherium dunexse. 



Diagnostic characters: — Tusk-like incisors well developed; pre- 

 molar (p") small, subtriangular, uniiobate; inlet of dental canal 

 much behind postmolar angle and much above alveolar 

 level ; exterobasal ridges of molars interrupted ; talons anterior 

 and posterior well-developed; molars gradually enlarged; inner 

 symphysial curve opposite hinder lolje of m\ 



