202 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



Measurements. 



mm. 



[ longitudinal of crown ; 6 



Diameters of m T < anteroposterior ; 4 



( transverse posteriorly ; 1.6 



f longitudinal of crown ; 5 



Diameters of m ^ -< anteroposterior ; 2 



( transverse posteriorly ; 1.5 



f longitudinal of crown ; 5 



Diameters of m ¥ < anteroposterior ; 2 



( transverse posteriorly ; 1 



The teeth of the second specimen are a little larger than those above measured. 

 They are in a decayed jaw, with the incisor in place, and they agree with the types 

 in all details, excepting only that the external column of the anterior lobe is not 

 grooved. 



The Wheatley collection contains a first inferior molar, and probably two 

 superior molars. The former differs from those above described in having a charac- 

 ter which is, I believe, only individual, since in every other respect the teeth are 

 identical. None of the triangles are isolated, but are connected by a narrow strip 

 of dentine, which is narrow posteriorly but widens anteriorly until it opens out 

 into the terminal loop. On this account the sectional name of Anaptogonia was 

 proposed for it. This name antedates that of Evotomys Coues by three years, and 

 must be used for the forms to which the name Hypudcens was used by Baird, 

 a name which had been already employed in another sense. 



In the inferior m. l,the triangles which do not open on one side to the anterior 

 loop are 1|, then one on each side, and the short wide terminal loop which is 

 bilobed or emarginate in the middle of the end. The ridges, which are very promi- 

 nent and acute, are, therefore, -§-; at the extremity there are two short ones, 

 between which a third and more prominent one rises a little below the grinding 

 surface. A little more attrition would give the distal loop a trilobate outline, and a 

 little more, an acuminate one, from the loss of the lateral angles ; finally the 

 median ridge disappears also. In its present state one of the terminal lobes is 

 almost external, making the ridges -§-. 



Measurements. 



mm. 

 Length, grinding surface ; 5.0 



Width, grinding surface ; ' 2.4 



Length, fang and crown ; 7.8 



Two opposite molars, held in natural relation by the matrix, resemble the above 

 in structure and size so closely as to leave little doubt that they belong to the same 

 species. Whether they should be referred to the superior or inferior series is uncer- 

 tain, though analogy with the Anaptogonia rutila would suggest the latter. They 

 represent the right and left second molars, and the triangular areas if isolated, 



