STATE GE0L0GIS1 109 



233. I n? 



L • I S ' Island in 



Locality — Pt au (in 



;k, var, / 

 The general tliis vari 



. ; the 

 .1 valve is ;il. p.. :, but 



• instead of being divided into four distinct plications, pr 

 but two, which are distinctly marked. The ventral valve 



[mens by two lat< ral 

 of the mesial fold and srk< <1 by 



3, tli'-lv. :it to the mesial sinus and 



a originating from a . No 



lety above is from th< nc. 



:■ shell l cars also a close relation to 8. rotundalus 

 plana(>i, DeKoninck (PI. XIV, Fig. 2, and $V1 ) It 



than thea 

 preaching in outline 8. a k. 



LocaWy — G l 



LAMKI .1.1 l'.R\ VCHI ATA 



201. Allorisma clavata, 



The "flat r slightly e extending like a 



ceptible in i Prom the Kaskaskia Limestone. 



Locality — Chelx sell enmity. 



i. Sp? 



■iblanee uota, McChesriey, from the 



Kaakasi itone, but differs thus: Not prolonged poste- 



than one third tl.e 

 length of the shell back from the • rtremity; ventral 



jin but 

 Beared; -nti ;<: i 



In form and makings it rei Lithodnmu 



McCoy, [Brit Pal. Rocks and Foss. PI. 3 I 



Irand EU narit} Island. 



- 

 AH'' \ rmian I'- - - Is, PI I X. 



b, Radesdale, Worthui 



