BY A. F. BASSET HULL. 655 



Wynyard and Table Cape, North-west coast of Tasmania. Mr. 

 Dun adds : " These beds are referred by Hall and Pritchard to 

 the Jan-Jukian, that is to say they are near the base of the 

 Tertiary as developed in Southern Australia. Victorian geolo- 

 gists correlate them with the marine series at Spring Creek. The 

 Eocene age attrilnited to these beds must be regarded as purely 

 relative." 



I have much pleasure in associating this species with the 

 di.scoverer. Type in the Australian Museum. 



EXPLANATION OF PLATE XVII., FIGS. 1-2. 



Fig.l. — Lorica duniana: one-half valve (median); insertion plate "restored." 

 Fig.2. — Lorica volvox Reeve: corresponding one -half valve for comparison. 



Both much magnified. 



