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SUPPLEMENT TO THE BRITISH 



3. Crania parisiensis, Def. Dav., Cret. Mon., PL I, figs. 1 — 7. 

 Specimens from Lower Chalk, Croydon. 



4. Crania ignabergensis, JRetzius. Dav., Cret. Mon., PI. I, figs. 8 — 14. 



Specimens from Upper Chalk, of Charlton j Lower Chalk, Guildford, Croydon • 

 Chloritic Marl, of Pinhay Cliff (Meyer). 



5. Crania irregularis? Roemer. Dav., Cret. Mon., PI. XII, figs. 40, 41 — not Crania 



cenomanensis, D'Orbigny, Dav., Cret. Mon., p. 103. 

 Crania irregularis, Roemer, Oolithengebirge II, 23, 

 pi. 18, fig. 1. 



Mr. Meyer doubts the correctness of my identification of this shell with the Crania 

 cenomanensis of D'Orb., and would refer it to the C. irregularis of Roemer. This, as 

 well as the other Faringdon species, will now have to be referred to the age of the 

 Lower Greensand or Upper Neocomian. 



6. Crania cenomanensis? 1)' Orb. 



Mr. Meyer has some imperfect specimens of a Crania from the Chloritic Marl of 

 Dunscombe Cliff, near Sidmouth, which may, perhaps, be referable to the above-named 

 species. 



I have also observed on a specimen of T. capillata, from the Red Chalk of Hunstanton, 

 in the collection of the Rev. T. Wiltshire, a small attached valve of a Crania somewhat 

 resembling C. cenomanensis, Supplement, PI. II, figs. 10 and 10 a. The muscular 

 impressions were, however, too faintly marked to enable me to feel certain as to its 

 identification. 



7. Thecidium Wetherelli, Morris. Dav., Cret. Mon., PI. I, figs. 15 — 26 (not 



PI. XII, fig. 39). 



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The lamellar processes seen under the beak of the ventral valve are sometimes 



