278 CRETACEOUS LAMELLIBRANCHIA. 



sliows some reseinlilance to I. cHnciformis, but is probably only a rather liigli form 

 of /. Crippi^i, with which species it is found associated. 



/. orhicnlarif, Goldfuss/ is regarded Ijy Bohm as a small form of /. Crippsi, 

 Mantell. 



TiJ2)e. — In the British Museum (fig. So) from the Chalk Marl (zone of ScJilwu- 

 hachia variant) of Off ham. 



DistrihiiJion. — Upper Greensand of Haldon. Upper Greensand (zone of Pecten 

 aspcr) of "Warminster and Devizes. Chalk Marl (zone of SrJila'iihacltla rarian.i) of 

 Ringmer, Hamsey, Oti'ham, Maiden Newton, Eggardon Hill, Tyrton, Chalton, 

 Arlesey, Hunstanton, and Donnington (Lincolnshire). Cenomanian of Wilmington 

 (Devon). Lower Chalk (zone of Hohtster suh(jlobosnii) of Totteruhoe, Burham, and 

 Cherry llintun. 



Inoceramus CiMiM'si nir. iiKACiiENSis, Ethoridjc, 188L Plate XLVIII, figs. 4, b ; 



Plate XLIX, fig. 1. 



1881. Inoceramus IiKtus \\\r. rexchessis, B. Etheridje. In Peuuing and Jukes- 

 Browne, Geol. Cam- 

 bridge, p. 142, i>\. i, 

 fig. 3. 



lie marks. — In this form, which is mainly characteristic of the zone of Ilolaxter 

 anhijluhosus, the ribs are more sharply defined, their ventral curvature is greater, 

 and their posterior part is less nearly straight than in I. CvippsL 



Tijpe. — From tlie Totternhoe Stone of Burwell, in the Sedgwick Museum, 

 Caml)ridge. 



Didrlhnt'wn.— ChiAk Marl of Blue Bell Hill, Burham. Zone of Ualastrr snli- 

 f/lohusiis of Merstham and Blue Bell Hill, Burham. Totternhoe Stone (zone of 

 II. .snhijJdho.^iis) of Burwell. Recorded by Etheridge from the C-halk Marl of 

 Reach. 



IiNouKKAMus Etiikimdcki, iiuiii. inic. Plate XLIX, figs. 2—4. 



1881. Inockramus convexus, ii. A'tlicrltlijc. In reniiing and Jukes-Browue, 



Gi'ol. Cambridge, [>. lio, pi. ii, 

 fig. 6. 



— — — var. QUADRATUS, Etlieridije. Ibid., p. 1-13, pi. ii, 



fig. 7. 



— — STRiA'ivs wir. cunvEXVs, A. J. JiiJies-llroirne. Cret. Rocks of 



Briiaiu, vol. iii, p. 476. 



1 ' Polref. Gerin.,' vol. ii (1836), p. 117, pi. fxiii, fi^'. 2. Biihm, ' Subhercyu. Kreidemulde' (1900), 

 p. Iti, pi. xi, fig. 1. 



