EXPLANATION OF PLATK LXI. 



Crass.\tkli.iti;s suijrr.Axrs ( Conrad ), p. 553 



1. The iiilenial cast nf a right vahc. 



XoT'i-siiik )iiarl: near H'ldiifurJ, f't'^^- 



2. Tlie inlenia! ca^t 'i| a riglit \al\a-. 



Red Baul; sand; Red Bunk, iJl6). 

 3-4. External antl internal \"ie\vs ni a right A'ahe. 



}farilhillli'ieii clay-iiiai'l : near Sz^'edesboro, (177). 



Ceassatemjtes TKA.xsvEKSfS ( Gabb ) , p. 555 



5. Lateral \ie\v of a left ^"alve. 



lleiii'iiuh sand: near Marlhoru . (ISO). 



Crassatei.lites prorus ( Conrad ) p. 55S 



6-7. Lateral and cardinal \'ie\vs of the type specnnen. (xAfter 

 Whitfield). 



Mereluiiilz-llle elay-murl .'; Crasszeicks. 



Crassatellites riio^ieEa (Whitfield ), p. 561 



8, Lateral \-ic\v nf one of the type specimens, 

 Manasgnan marl; Xeze Egytt. 



Crassatellites uttokalis (Conrad ) p. 559 



0. Lateral Aaew of one of the tyjie specimens of Crassatella con- 

 radi A\'hitf. 



Maiiasgiiaii mail; Squankam. 

 ID- Lateral view of one c,f the specimens illnstratcd by AMiitfield. 

 }fanasi]nan marl: Squanknni. 



Crassatellites cuxEatus ( Gabb ) p. 556 



11-12. Lateral views of two internal casts. 



M erehanlz'dle elay-marl ; I.euula, (163). 



SCAMBL'LA rERPLANA Coiirad p. 562 



13. An internal cast of a left vahe. 



IJ'iaidbiiry elay: Lurillard, (102). 



14. An iiUernal east nf a left valve. 



' Wenonah sand ; near Marlborough, { i^o). 



1004 



