MOLIvUSCA. 499 



convex like Diploschiza cretacea. It possesses the regular con- 

 centric marks with the discontinuous radiating strise of Whit- 

 field's interpretation of Anomia argentaria, and the marginal 

 apex of the same author's interpretation of Anomia tellinoides. 

 Formation and locality. — Cliffwood clay, Cliffwood Point 

 (105), near Matawan (189); Merchantville clay-marl, near 

 Matawan (loi), near Jamesburg (140, 139, 141), Merchantville 

 (162), Lenola (163); Woodbury clay, Lorillard (102), near 

 Matawan (103), Crosswicks (168); Marshalltown clay-marl, 

 near Swedesboro (177, 180); Wenonah sand, near Miarlboro 

 (130^); Navesink mafl, near Crawfords Corners (126'''), Mid- 

 dletown (113^), Crosswicks Creek (147*), Holmdel (Whit- 

 field), ? Freehold (Whitfield); Red Bank sand. Middletown 



(112). 



Geographic distribution. — New Jersey, North Carolina, Ala- 

 bama, Mississippi, Arkansas, Texas. 



Anomia radiata n. sp. 

 Plate LIV., Pigs. 16-17. 



Description. — Shell irregularly subovate in outline, the dimen- 

 sions of the type specimen being: height, 12.5 mm.; width, about 

 20 mm. Free valve depressed convex, the apex marginal. The 

 attached valve flatter, the perforation near the margin. Both 

 valves marked by rather coarse, irregular, nodose, radiating 

 costas, the nodes being small squamose projections as shown by 

 impressions of the exterior. 



Remarks. — The example selected as the type of this species is 

 the most complete of several individuals which are attached to 

 the leaves of a marine plant, the plant having been fossilized 

 with the shells attached. Impressions and casts of other indi- 

 viduals are not uncommonly met with in the collections from 

 the Merchantville and Woodbury formations, but no others have 

 been seen attached. Some of these specimens are much larger 

 than the type, the larger ones sometimes having a maximum 

 diameter of nearly 30 mm. In the character of their surface 

 markings the members of this species resemble Par anomia 



