JURASSIC PERIOD. 



463 



tinet insectivorous unguiculate quadrupeds, it is not impossible but that the 

 Stereognathus may have belonged to that order." 



Of the species found in the uppermost Oolite, the Purbeck beds, there are the 

 following: — Triconodon mordax Owen, nearly as large as a hedgehog (length 

 of ramus of jaw, 1£ inch), 1 another species of the genus, a third larger : they 



Figs. 741, 742. 



Mammals. — Fig. 741, Amphitherium (Thylacotherium) Broderipii ( X 2); 

 742, Phascolotherium Bucklandi ( X 2 ). 



are allied to the Stonesfield species, and were probably marsupial. Plagiaulax 

 Becklesii and P. minor of Falconer, — probably Carnivorous Marsupials; the former 

 as large as an English squirrel (length of ramus of jaw, 1J inch), the latter 

 more than half smaller. Spalacotherium tricuspidens Owen, — probably an in- 

 sectivorous Marsupial; length of ramus of lower jaw, about an inch. Another 

 species is the Ericulus of Falconer, regarded by him as an Insectivore not mar- 

 supial. 



3. Wealden Epoch. 



1. Plants. — Conifers closely allied to Araucaria, Abies, Cupressus, Junipe- 

 rus ; Cycads; trees allied to Dracaena, Yucca, and Bromelia ; Equiseta and Ferns ; 

 the delicate Charse of rivulets. 



Figs. 743, 744. 



4:3 



Mollusks.— Fig. 743, Uuio Valdensis ; 744, Vivipara (Paludina) Fluviorum. 

 2. Mollusks. — Fresh-water species in large numbers, especially of the 



