THE TRIASSIC PERIOD. 231 



lastly, there has been found in strata of Triassic age one of 

 the branches of the lower jaw of a small Mammal, which has 

 been described under the name of Drowiatherium sylvestre 

 (fig. 156). The fossil exhibits ten small molars placed side 

 by side, one canine, and three incisors, separated by small 

 intervals, and it indicates a small insectivorous animal, prob- 

 ably most nearly related to the existing Myrmecobius. 



LITERATURE. 



The following list comprises a few of the more important 

 sources of information as to the Triassic strata and their fossil 

 contents : 



(1) 'Geology of Oxford and the Valley of the Thames.' 



Phillips. 



(2) ' Memoirs of the Geological Survey of Great Britain and 



Ireland. ' 



(3) 'Report on the Geology of Londonderry,' &c. Portlock. 



(4) " On the Zone of Avicula contorta, " &c. ' Quart. Journ. 



Geol. Soc., ' vol. xvi., 1860. Dr. Thomas Wright. 



(5) " On the Zones of the Lower Lias and the Avicula con- 



torta Zone " ' Quart. Journ. Geol. Soc., ' vol. xvii., 1861. 

 Charles Moore. 



(6) " On Abnormal Conditions of Secondary Deposits, " &c. 



' Quart Journ. Geol. Soc., ' vol. xxiii., 1876-77. Charles 

 Moore. 



(7) ' Geognostische Beschreibung des Bayerischen Alpenge- 



birges. ' Gumbel. 



(8) ' Lethaea Rossica. ' Pander. 



(9) 'Lethsea Geognostica. ' Bronn. 



(10) ' Petrefacta Germanise. ' Goldfuss. 



(11) ' Petrefaktenkunde. ' Quenstedt. 



(12) 'Monograph of the Fossil Estheriae ' ( Palaeontographical 



Society). Rupert Jones. 



(13) "Fossil Remains of Three Distinct Saurian Animals, 



recently discovered in the Magnesian Conglomerate 

 near Bristol " ' Trans. Geol. Soc., ' ser. 2, voK v., 1840. 

 Riley and Stutchbury. 



(14) 'Die Saurier des Muschelkalkes. ' Von Meyer. 



(15) ' Beitrage zur Pabeontologie Wurttembergs. ' Von 



Meyer and Plieninger. 



(16) 'Manual of Palaeontology.' Owen. 



(17) ' Odontography. ' Owen. 



(18) 'Report of Fossil Reptiles' (British Association, 1841). 



Owen. 



