EXPLANATION OF PLATE LIV. ' 



DiANCHllKA ECHIN'ATA ( MortOll), P. 487 



1. The interior of a lower valve attached to the inside of a 



Gryf'haca -WW 



2. View of the hinge oxtremily of an individual attached to the 



interior of a Grypliaca shell, showing the convex outline 

 of the cast of the upper val\-e. 

 Xa:u-siiik marl 



Lima rETIcilata ( Lyell and Forhcs ) p. 49- 



3. A right \al\e preserving the shell. 



Marslialllowii clay-iiiarl ; near Swcdcsboi'o, (.IJ/)- 



4. The internal cast nf a right \'al\"e. 



Xaz'csiiik marl; near Wahiford, iilQ). 



Lima i.iirii.i.akiii'.xsis n. s-p p. 4QJ 



5. The left side nf a crushed internal cast. 



0. Squeeze from the impressinn of the exterior of the same. 

 U'oaJbiiry clay: l.nriUard. U02) . 



LiM.v rELAGiCA ( .Morton 1 p. 489 



7. A nearly Com]ilele left \-al\ e. 



Xai'Lsiiik marl; near iraliiforJ . (14;*). 



LuiA WHiiriELDi n. sp p. 491 



S. A \"ery perfect right i'.-ilxc, dlustrated hy Whitfielil as Radida 

 pclagica. 



Xa-Z'rsiiiL- marl: near Hohiidcl. 



Lima jiONiiouTHENSis ( Whitheld ) p. 494 



9. \'iew of the type specimen, illustrated b_\' AAdiitlield as Xuciila 

 inaniiioutlirnsis. 



U'riianah sand: Marlboro. 

 Placiostom.\ ei;Ecta ( Whitfie'd ) p. 405 



10. View of a right vahe preser\ing the shell. 



Marshalltoien clay-marl; near Sieedesboro, (177). 

 Ano.mia .\RC.Exr \kt.\ ^lorton p, 496 



11. A cast nf the inleriiir of the upper \alve. 



Cliff wood elay: Cliff wood Point, (105). 



12. A specimen retaining the shell. Illustrated by Whitfield. 



Xavesinl; marl; Freehold. 

 13-14. Two \iews of a ci jmpletc internal cast, the lower side showing 

 the position of the jierforation of the \alve. 



Merelianlzdlle elay-iuarl; l.enola, li6s). 

 15. A group of specimens, retaithng the shells. Illustrated by 

 Whilfield as .1. tellinoides. 



Xaz'esii:f marl: Preeliold. 



Axomia raiiiat.\ n. sp. p. 499 



16-17. Two views of the type specimen, ,a nearly complete internal 

 cast. The \'iew lif the under side shows the position of 

 the perforation of the vahe. 



H'ionibnry elay: LoriUard , (103). 



990 



