328 



outer wall of its socket. A notched lobe projects from the posterior 

 part of the outside of the crown of this tooth : the anterior end has been 

 broken away. 



From one of the caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



1521. A considerable portion of the right ramus of the lower jaw of a Ma- 



cropus, with the root of the large procumbent incisor and four of the 

 molar teeth in situ. 



From one of the caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



1522. A fragment of the right ramus of the lower jaw of a Macropus, with 

 the anterior molar and a portion of the second molar. 



From one of the caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



1523. A portion of the left ramus of the lower jaw of a very young Kangaroo, 



with two molar teeth still concealed in their sockets. 



From one of the caves in Wellington Valley, Australia.. 



Presented by Count Strzelecki. 



1524. A portion of the left ramus of the lower jaw of a Kangaroo (Macropus 



affinis, Owen), with the penultimate and antepenultimate molars, show- 

 ing the crowns much worn by mastication : the crown of the last molar 

 has been broken off, and there are the remains of two molars anterior to 

 the antepenultimate one ; the extent of the four posterior molars is one 

 inch ten lines ; the penultimate molar, besides its inferior size, differs 

 from the corresponding tooth in the Macropus Atlas, in being narrower 

 in proportion to its length, in having a relatively smaller anterior talon, 

 and no posterior one ; it differs a fortiori from the antepenultimate molar 

 of the Macropus Titan, inasmuch as this has a larger proportional an- 

 terior talon than in the Macropus Atlas. The teeth and the jaw of this 

 specimen closely agree in size with those of the large male Macropus 

 laniger, No. 151 1 1 , but the inner lobes of the penultimate molar are 



