368 Mr. G. Ki'efft on a ne\c Australian Ziphioid Whale. 



which are rather marked, were points of muscular attachment 

 for the foliaceous appendage it supported. 



With the exception of these arches, the under surface of the 

 venter must have been delicately membranous, like that of the 

 abdomen of a lobster or other macrm'an. Unless the under 

 surface were in the main fleshy, Trilobites could not have 

 rolled into a ball. 



XL VIII. — Notice of a new Atistralian Ziphiotd Whale. By 

 G. Krefft, F.L.S. ; with a Note hj Dr. J. E. Gray,F.R.S. 



I ENCLOSE the photograph of the tooth of a new whale, 18 feet 

 long, caught in Little Bay. It is allied to the genus Meso- 

 plodon^ and I propose to call it Mesoylodon Giinthfri. We 

 have the entire skeleton. The tooth was imbedded in the 

 mandible, and is bent, the tip towards the margin ; but it was 

 not visible from without. Unfortunately, the body was very 

 much hacked and lacerated ; but most of the abdominal vis- 

 cera have been saved. 

 Sydney, Feb. 24, 1871. 



The form of the tooth is so unlike that of any other Ziphioid 

 known, that I regard it as indicating a new genus, which I 

 would propose to call Gallidon^ characterized by the form and 

 surface. It is here figured from Dr. KrefFt's photograph 

 and sketch. — J. E. G. 



