210 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



about 60, they are flat, smooth, the sulci slightly narrower than the 

 ribs. A few concentric low ridges are visible on the posterior part of 

 the shell, forming low nodules on crossing the ribs. This seems to 

 imply that towards the margin the ribs may have been granulate, 

 squamose, or spinous. Umbo elevated, incurved, and slightly proso- 

 gyrate. The hinge - plate is rounded, elevated, and bent over 

 towards the rather long and straight nympha, forming a deep groove 

 for the insertion of the ligament. There are two smooth cardinals 

 reaching as high as the top of the umbo ; the posterior tooth is 

 stouter, conical, united t.n the outside with the smaller anterior tooth, 

 leaving a deep socket between them. Part of a posterior lateral tooth 

 is present. 



The anterior part of the shell is most likely much shorter than 

 the posterior, and the length of the valve may have been between 

 40 and 50 mm. 



Locality. — Waitaki Valley, North Otago, New Zealand (Professor 

 J. Park). 



Formation. — Warekuri Greensands. Labelled " Oamaru Series, 

 Oligocene." Miocene (J. Park, 1905). 



Type in my collection. Dr. W. H, Dall wrote about this species : 

 " A Cardiimi, belonging to the section Trachycardium, and related to 

 C. gigas, Defr., of the Paris basin Eocene." 



Professor Park also sent me a fragment of a carditoid shell, near 

 Venericardia, which, however, is quite insufficient for description. 



