214 ' PROCEEDINGS OF THE ACADEMY OF [April, 



Length 23, height 24, diameter 15.6 mm. 



Length 23.5, height 23.3, diameter 16.7 mm. 



Geographe Bay, West Australia. Cotypes two valves, right and 

 left, received from Dr. J. C. Cox, of Sydney, New South Wales. 



The strongly developed concentric sculpture of this species is unlike 

 any described Pectunculus known to me. The flat posterior dorsal 

 slope is another peculiar feature. Dr. Cox writes that it has never 

 been found in fresh condition or with the valves attached. 



