ANOMIAD^. 
21 
*** Two upper scars small ; loiver one large. Shell suborbicular ; 
sinus small. Patro. 
Patro, Gray, Proc. Zool. Soc. 1849, 118. 
17. Anomia elyros. 
White, lamellar, closely radiately striated. The disk of the upper 
valve with three separate subcircular scars; the two upper scars 
small, subequal, one under the other; the lower one large, nearly 
circular, subcentral. Notch in lower valve very small. Plug small, 
elongate, subcylindrical ; the notch small, with reflexed edges. 
Anomia elyros. Gray, P. Z. S. 1849, 118 ; Moll. t. 4, f. 1, 2. 
a, b, c, d. Adult, thick ; disk white, thick. Port Essington. 
Presented by the Earl of Derby, 
e,/. Adult. Port Essington. Presented by J. B. Jukes, Esq. 
g. Adult. Depuch Island. Presented by Capt. Wickham. 
h. Adult, thin ; disk thin. Port Essington. Presented by 
Capt. Sir Everard Home, Bart., E.N. 
The small size of the upper scars in this species probably depends 
on the small size and elongated form of the plug. The other spe- 
cies, which have the upper scar the largest, have at the same time 
a larger notch and a broader plug. 
3. LIMANOMIA. 
Shell adherent, longitudinal, subequivalve, inequilateral ; umbo 
curved to the right, regularly curved on each side, cardinal edge 
transverse, oblique, inclined to the right ; valves thin near umbo, 
slightly radiately ribbed ; lower valve with a subtriangular 
notch near the umbo, under the ear ; cartilage ridge ? 
muscular scars ? Plug triangular, calcareous, with 
a narrow, scalariform impression. 
Limanomia, Bouchard, Chantereceux MSS. (in letter) 1850. 
This fossil genus, which has the external form of a Lima and the 
plug and habit of Anomia, has hitherto only been found in the De- 
vonian limestone. 
