270 



CRETACEOUS LAMELLIBRANCHIA. 



1906. Inoceramus svlcatvs, A. WoUemann. Jahrb. d. k. preuss. geol. Landesanst. 



f iir 1906, vol. xxvii, p. 273, pi. vi, 

 ficj. 10. 



Nou 1827. 



8. Nilssoii. Petrif. Suecaua, p. 18. 



Description. — Shell more or less ovate, mach higher than long, very inequi- 

 lateral, more or less considerably ine(|ni valve. Anterior part of valves flattened 



'%. 



, \. 



^ 



<. 



Fig. 30. — Inoceramus, B-p. Gaiilt, Folkestone. Sedgwick Museum, Cambridge. Intynial cast of right 



valve. X 4- 



or concave. Posterior part somewhat expanded and less convex than the part 

 below the umbones. Left valve very convex, with a high, narrow, pointed 

 anterior umbo which is considerably incurved and bends forwards. Right valve 

 rather less convex than the left valve, with a smaller umbo which bends forwards 

 and slightly inwards. 



Ornamentation consists of strong angular radial i-idges (plications), usually 

 from eight to ten on each valve, which are often unorpial in size and are separated 



