Dcscriptloiifi of Species. 25 



Leda (?) haiveyi sp. nov. 



Plate I, Figs. 7, 8. 



Slicll minute, one-sixteenth to one-eightli of an-inch in length, 

 elongate, smooth, concentrically striate; beaks situated at ante- 

 rior tliird, blunt, thick, and recurving; posterior cardinal margin 

 elongate, straight, or slightly concave ; pallial margin straight or 

 slightly sinuous ; anterior cardinal margin short, straight ; ante- 

 rior margin very slightly rounded at l)ase ; posterior margin 

 angular, short, and straiglit; anterior half of shell thick, sulv 

 globular ; posterior half elongated, rapidly thinning posteriori}^ 

 and sometimes marked l)y a strong angular ridge extending from 

 ))eak to union of pallial and posterior margin ; cardinal area not 

 exposed so as to sl>ow hinge mechanism. 



This minute shell occurs in great masses, resembling small 

 1)lack specks in a calcareous cement, which under the magnif}^- 

 ing glass reveals the outline shown in the figures; the hinge 

 mechanism not seen. , ' 



Found thus far only at the plant l)eds of the Paluxy, near 

 Olen Rose. 



Named in honor of IMi'. .1. W. Harvey, who first collected from 

 tliis locality, l)ut died l)ef()re the collections could l)e pul)lislied.''' 



Cucullaea gratiota Hill. 



Area, f/rntiofn Hill. Arkansas Geological >Survey, Annual Re- 

 ])ort 18SS, vol. ir, p. 133, plate 14, figs. 2, 2a. Described and 

 figured in my Arkansas Report as Area r/raiiota. Occurs also in 

 plant l)eds near Glen Rose, Texas, and in Iduffs of Colorado. 



Cucullaea comanchensis sp. nov. 



riate III, Figs. 1, 2. 



Cordate, globose, thicker and higher than long, sul)quadrate 

 in lateral aspect ; posterior margin strongly truncate, pallial 

 margin gentl}^ rounded ; anterior margin short and truncate ; 

 ^c:tterior of cardinal area elongate and broad ; umbones small, 

 'high, and incurved, but not touching; shell thick, rough, and 

 marked by strong, irregular, rugose lines ; hinge mechanism not 

 visilde. 



*See American Geologist, October, 1802. 



4— Bior.. Sor. Wash., Vor,. VIII, ISO:',. 



