MAMMALIA. 339 



Stuttgardt, the geological relations of which are well deter- 

 mined as between lias and Keuper sandstone. The teeth of 

 Microlestes from an agglomerate occupying a fissure of the 

 carboniferous limestone near Frome, submitted to the writer 

 by the discoverer, Mr. Charles Moore, F.G.S., in 1858, are 

 four in number, two being molars of the upper jaw, each 

 with four fangs ; one a molar with a narrower crown and 

 two fangs from the lower jaw ; and the fourth a small, pointed, 

 front tooth. The crowns of the molars are short vertically in 

 proportion to their breadth ; the distinct enamel contrasts 

 with the cement-covered fangs ; the grinding surface shews a 

 wide and shallow depression, surrounded by small, low, 

 obtuse cusps, three of equal size being on one side, a larger 

 cusp near one end, and smaller and less regular cusps on the 

 side opposite the three. One lower molar shews a similar 

 type, but with the three marginal cusps less equal in size : a 

 second smaller, and from a more anterior part of the series has 

 three low cusps on one side, and but one cusp on the other 

 side of the crown, the grinding surface of which presents an 

 elongate triangular form. This tooth had two fangs. The 

 crown of the largest of the upper molars does not exceed one 

 line in its longest diameter. Amongst existing Mammals, 

 some of the small molars of the marsupial and insectivorous 

 Myrmecobius of Australia offer the nearest resemblance to 

 these fossil teeth ; but a still closer one is presented by the 

 small tubercular molars of the extinct oolitic Mammal called 

 Plagiaulax (fig. 120, m i and 2). 



Genus Dromatherium* — This genus is founded on a 

 ramus of a lower jaw, not quite an inch in length, containing 

 7 tricuspid molars, like those of SpalacotJicrium, preceded 

 apparently by 3 simple, slender, cuspidate premolars, in a 

 continuous series ; in advance of which is a canine and 3 

 conical incisors, the latter being divided by short intervals, as 



* Emmons, "American Geology," pt. vi., 1857, p. 03. 



