MARYLAND GEOLOGICAL SURVEY 611 



Anomia tellinoides Meek, 1864, Check List Inv. Fossils, N. A., Cret. and 



Cret. and Jur., p. 7. 



Anomia tellinoides Conrad, 1868, Cook's Geol. of New Jersey, p. 724. 

 Anomia tellinoides Whitfield, 1885, Mon. U. S. Geol. Survey, vol. ix, p. 43. 

 Anomia tellinoides Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 12. 

 Anomia argentaria Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 496 (ex parte, description and figures excluded). 



Description. " Irregular, but mostly subovate, with concentric undu- 

 lations. Both these species are common in New Jersey; the latter 

 resembles A. ephippium, to which it is referred in the first part of this 

 Synopsis." Morton, 1833. 



Type Locality. New Jersey. 



Shell rather thin but tenacious, inequilateral, transversely ellipsoidal in 

 outline, the lower valve moderately convex; anterior portion of the shell 

 constricted in front of the umbones ; anterior margin broadly and evenly 

 rounded ; posterior portion of shell symmetrical, rounded ; base arcuate ; 

 umbones low, not very conspicuous, with ill-defined apices placed as a 

 rule a little behind the median line ; external surface sculptured with an 

 indistinct and rather distant concentric lamination; ligament submar- 

 ginal attached beneath the umbo of the left valve; hinge plate not 

 developed, edentulous; pedal and byssal scars indistinct. 



This species has been confused in the synonymies with A. argentaria. 

 The forms are certainly closely related but there is not sufficient evidence 

 of their identity. A. tellinoides is transversely ovate in outline, rather 

 than subcircular, the surface is less silvery, the concentric lamination less 

 crowded and the radial striations much less commonly developed than in 

 the more prolific A. argentaria. 



Occurrence. MONMOUTH FORMATION. Briar Point, Chesapeake and 

 Delaware Canal, Delaware. 



Collections. Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, New Jersey Geological Survey. 



Outside Distribution. Monmoutli Formation. Navesink marl, New 

 Jersey. 



