APPENDIX. 



P. 64. I learn from Mr. Pentland, that the head of a species 

 of Dasyurus as large as, and closely allied to, D. Cynocephalus 

 (Thylacinus Harrisii) of Van Diemen's Land, has been recently 

 discovered in the Eocene Fresh-water limestone of Auvergne. 

 The Thylacinus is the largest of the carnivorous marsupial 

 animals, being of the size of a wolf, but having shorter legs; it is 

 the only living species of this genus, and is found only in Van 

 Diemen's Land. 



P. 131, Note. In the Tertiary formations we have fossil frogs, 

 tadpoles, and salamanders, in the Papier Kohle near Bonn (see 

 P. 382, Note, and P. 385, Note, 1. 36,) and fossil Snakes in the 

 Fresh-water strata of Clermont, in Auvergne. 



P. 250. It is shown in a notice read by M. Voltz to the 

 Natural History Society at Strasbourg, December 6, 1836, that 

 the problematical fossils known by the name of Aptychus, Trigo- 

 nellites, &c. which are sometimes found lodged in pairs within the 

 first chamber of Ammonites, were Opercula connected with the 

 foot, or organ by which the animals inhabiting these shells moved 

 along the bottom of the sea. (L'Institut, February 8, 1837.) The 

 form of the dense coriacerous foot of the Pearly Nautilus figured 

 by Mr. Owen in his Plate 3, Fig. 1, (See our Supp. Note, P. 

 456,) resembles that of the valves of several species of Aptychus; 

 but it has no shelly appendage. 



