Cryptoplax in Tertiary Rocks of Victoria. 393 



The tegmentum is smooth, being abraded, but traces of a 

 median ridge are traceable, the shell in this region being 

 irregularly and finely pitted. Median length of vaive (imperfect) 

 3.7 mm., breadth 1.9 mm. 



Locality. — Clifton Bank, Muddy Creek. Balcombian 



(? Eocene). A single valve. 



The two species are dedicated to Messrs. G. B. Pritchard and 

 J. H. Gatliflf, who have done so much in elucidating the recent 

 moUuscan fauna of Victoria. 



DESCRIPTION OF PLATE. 



Cryptoplax pritchardi, n. sp. Figs. 1 and 2, <lorsal and lateral 

 views of valve. Figs. 3 and 4, do. of valve VIII. Fig.s. 

 5 and 6, do. of (?) valve II. 



Cryptoplax gatliffi, n. sp. Figs. 7, 8, 9, dorsal, lateral and 

 internal view of valve. 

 [All the figures are drawn under the camera, and are magnified 



to the same scale.] 



