278 CRETACEOUS LAMELLIBRANCHIA. 



shows some resemblance to I. ennciformk, bat is probably only a rather high form 

 of /. Crippsi, with which species it is found associated. 



I. orbicidaris, Goldfuss,^ is regarded by Bohm as a small form of I. Gripjjsi, 

 Mantell. 



Type. — In the British Museum (fig. 33) from the Chalk Marl (zone of ScMam- 

 1 Hi cilia variaiis) of Off ham. 



Bistrihidion. — Upper Greensand of Haldon. Upper Greensand (zone of Pecieii 

 (ixper) of Warminster and Devizes. Chalk Marl (zone of Scldmnhachia varians) of 

 Ringmer, Hamsey, Offham, Maiden Newton, Eggardon Hill, Pyrton, Chalton, 

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

 (Devon). Lower Chalk (zone of Hulaster subglobosus) of Totternhoe, Burliam, and 

 Cherry Hinton. 



Inoceuamus Ciui'i'SL oar. reachensis, Etheridge, 1881. Plate XLVIII, figs. 4, 5 ; 



Plate XLIX, fig. 1. 



1881. Inoceeamus IjAtuh veiY. reacuensis, B. ElherUhje. In Peuuing aud Jukes- 

 Browne, Geol. Cam- 

 bridge, p. 142, pi. i, 

 fig. 3. 



Remarhs. — In this form, which is mainly characteristic of the zone of Hulaster 

 8nh(jIuho>iUS, the ribs are more sharply defined, their ventral curvature is greater, 

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



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

 Cambridge. 



Distribution. — Chalk Marl of Blue Bell Hill, Burham. Zone of Holaster f^nb- 

 (jlobosus of Merstham and Blue Bell Hill, Burham. Totternhoe Stone (zone of 

 H. subglobosus) of Burwell. Recorded by Etheridge from the Chalk Marl of 

 Reach. 



Inoceuamus Etheridgei, nam. nor. Plate XLIX, figs. 2—4. 



1881. Inoceeamus convexus, K. Etherklge. In Penning aud Jukes-Browne, 



Gcol. Cambridge, p. 143, pi. ii, 

 fig. 6. 

 — — — Tar. QTJADEATUS, Etheridge. Ibid., p. 143, pi. ii, 



fig. 7. 

 • — • — ■ STEiATUS var. CONVEXUS, A. J. Julces-Bmivne. Cret. Eocks of 



Britain, vol. iii, p. 476. 



1 ' Petref. Germ.,' vol. ii (1836), p. 117, pi. cxiii, fig. 2. B5hm, ' Subhercyn. Kreidemulde' (1909), 

 p. 46, pi. xi, fig. 1. 



