Pigs. 1-4. Inoceravms salomoni d'Orb., Mammillatum Bed ; left valves : 

 2, anterior view; 4, umbo and hinge-area. 5-9. I. conceiitrimts 

 Park., Gault : 5, left valve ; 6, anterior ; 7 & 8, umbo and hinge-area ; 

 9, right valve. 10-18. /. concentricusYSiY. stcbstdcattis WWtsih., Gault : 

 left valves. 19-21. /. sulcatns Park., Gault : 19, anterior; 20 & 21, 

 left valve. All @) two-thirds of the natural size. 



b2 



