EXPLANATION OF PLATE LXIU. 



Clavaceij.a Ak.MATA Mdrtoti, p. 525 



1-2. Lateral and cardinal views of a very perfect internal cast. 

 Niii'rsiiil; marl; .Itlaulic Highlands, ( loS ) . 

 LlOPISTHA KUMMIU,! n. Sp. p. 529 



3. Lateral "\ie\v nf llie t_\pe specimen, an internal cast. 



Mcrcliiiiilz'illc cluy-iiiarl : Lciiola, {Kif), 

 LlOPISTHA I'ROTK.KT.v (C'linrad) p. 526 



4. I^ateral \'iew of an internal cast of a single vah'e. 



lied Bank sand; near Middlctown. (112). 

 5-6. Lateral and cardinal views of a very perfect internal cast. 

 A'ai'csink marl; Midlli-a Hill, (l6g). 



LlOPISTI-I.V ALTERNAT.V n. Sp p. 527 



/-S. Lateral \'iews of two internal casts. 



Merrlianlz'illc Lluy-marl ; near Matazean, (roi). 

 (J. Lateral \iew of an internal ca^t. 



Mei'elian/z'ille elay-niail : near Janiesbiirg, irjg). 



Cymei.i..\ r.nLi.A Conrad p. 530 



10. I_^ateral \ie\v 'if -.m iiicemiplete internal cast of a single valve. 



CIiffieu:\i elay; near Malaz^'an, (joy). 

 u. Lateral \'iew nf an internal cast of a single vah-e. 

 Jl'eni'iiah sand; near Marlboro, (ijO). 



12. Lateral vie\v nf ilie internal cast of a large single valve. 



ll'oodhury elay; Lorillard, Oos). 

 Cymhula undata (Meek and LIa\den') p. 531 



13. I^ati-'ral ^■lew nf .-i small smgle \"al\c. 



H'enoiiah sand; near Marlboro, (130). 



CuSPID.\KI,\ JERSEVEXSIS n. sp,, p. 534 



14-15. Lateral and cardinal \aews id" the type specimen. 



Xuz'esink mail; near Crazefords Corner^ (126'). 



Cuspin.\Rr.\ vEXTRicoSA ( Meik and A\'orthcn ) p. 533 



16-17. I^ateral ^aews of two more or less distorted internal casts of 

 sejiarate \'a]\es. 



lied Hank sand; Red Bank, (116). 



VentEIXA Conraiji Mortrm p. 534 



iS. External \ lew nf a nearly fierfect left valve. 

 19. \"iew of the hinge of a right valve. 



Marshalltozen elay-niarl ; near Szeedesboro, (177). 



Eti;a trapi'.zoide \ ( Conrad ), p. 543 



20-21. I,ateral \iews of two internal casts. 



}[erehanlz'ille clay-nnirl; near Malazean, (joi). 



A^ENiEi.r.A ? Riioi[EoiDi;.\ Cnnrad, p. 53S 



22-24. I^ateral, CLirdinal and anterior views of a nearly perfect in- 

 ternal cast. 



Manasiinan niaid; I'armingdale. 



Ventei.e.v ? PjEcis.v ( i\fnrtnn), p. 540 



25-20. Lateral and posterior A'iews of an internal cast identified as 

 this species by \\ hittield. 



Hornerstozen marl: Bine Ball. 



998 



