s 
158 : Fossils from Australia. 
ig 7 ? ) 
ed carina between the flank and lateral surface. Valves thick. Lateral 
surface strongly flattened at middle or even concave.—Resembles much 
Panopza and Pholadomya, especially Agassiz’s Arcomya; but differs 
in its entire palleal impression, its second anterior muscle, as well as 
38. My 
height much less than half the length; flank in cast flattened and dis- 
muse 
ulcations ; palleal 
ous; lateral surface not flattened; surface nearly smooth with occa- 
sional faint lines of growth and no trace of radiations ; inferior margin 
arcuate.—Length 2# inches ; height .8,3, L; thickness 3% L; apical an- 
gle 124°.—Harper’s Hill. 
40. Eurydesma globosa.—Thick, tumid, suborbicular, not transverse, 
very evenly convex; beaks contiguous; lateral surface every where 
convex; surface smooth with faint concentric lines of growth and no 
trace of radiations; inferior margin and lines of growth, regularly or- 
biculate.—Length and breadth 1,9, inch; thickness 74% L; apical an- 
gle 97°.—Harper’s Hill? Illawarra 
surface marked rather faintly with lines of growth, a little uneven. 
—Length 1} inch; height ~ L; apical angle about 132°— 
Illawarra. ; 
