368 Mr. G. KrefFt on a new Australian Ziphioid Whale. 



which are rather marked, were points of muscular attachment 

 for the foliaceous appendage it sup])orted. 



With tlie exception of these arclies, the under surface of the 

 venter must have been delicately membranous, like that of the 

 abdomen of a lobster or other macruran. Unless the under 

 surfoce were in the main fleshy, Trilobites could not have 

 rolled into a ball. 



XLVIII. — Notice of a new Australian Zipliioid Whale. By 

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



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

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

 2'>lodon, and I propose to call it Mesoplodon CrUntheri. 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 Callidon^ characterized by the form and 

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

 and sketch. — J. E. G. 



