21--. 



extremity are two low, diverging plications or ridges, 

 which would be grooves on the interior of the test. These 

 are quite invisible on the exterior of the shell. Hinge line 

 short and curved, showing in one specimen the trace of 

 what might be a cardinal tooth, similar to the other species 

 of Astdi'tiln already dealt with. 



Dimensions — Length 1{ inches ; height L' inches; thick- 

 ness of united valves H of an inch. 



Loc. Burrier (D). 



Hor. Wandrawandian Series. 



Obs. This is one of the common species at Barrier, and 

 specimens are well preserved, though somewhat dillicult 



Astartila SP. (Type D). 



Description — Shell broadly oval, with the general 

 external appearance of a typical modern Tapes. Beaks 

 moderately prominent and anteriorly situated. Hinge line 

 fairly long and curved, with long narrow opisthodetic 

 ligament. Margins regularly rounded. Shell substance 

 moderately thin. Ornamentation as in other members of 

 the genus, concentric, consisting of numerous growth 

 wrinkles. Internal structures unknown. 



Dimensions— Length 1 inch ; height | of an inch ; thick- 

 ness of united valves £ an inch. 



Loc. Burrier (D). 



Hor. Wandrawandian Series. 



Obs. Several good specimens were found at Burrier, but 

 it is not so common as the other species. 



(Rec. Aust. Mas., vol. ni, 1897-1900, p. 185, pi. 2-5.) 



Description— Valves equal, soleniforme, elongated, 



almost quadrangular, somewhat rounded behind. The shell 



is much inflated, the section of the united valves being 



