538 L. F. Spath. — A neiv Ammonite from Chavmoutli. 

 EXPLANATION OF PLATE XIV. 



FlQ. 



L Etheridgina coinplectens (Etlieridge). x 4. View of pedicle valve, after 

 Etheridge, 1876. 



2. Id. X 4. View of pedicle valve, after Etheridge, 187S. 



3. Id. X 4. View of conjoined valves, figure by Greger from Fifesliire 



specimen. 



4. Etheridgina radicans (Wincliell). x 2. Interiors of two pedicle valves, 



after Beecher. 



5. Id. X 2. View of specimen with conjoined valves, after Beecher. 



6. Id. X 2. View of pedicle valve, after Hall & Clarke. 



7. Id. X 3. View of conjoined valves, after Hall & Clarke. 



8. Id. X 3. View of pedicle valve, after Hall & Clarke. 



9. Etheridgina Iceokuk (Beecher). x 2. Viev/ of conjoined valves, after 



Hall & Clarke. 



10. Id. X 2. View of ijedicle valve, after Beecher. 



11. Id. X 2. View of specimen with conjoined valves, after Beecher. 



12. Etheridgina scintilla (Beecher). x 4. View of pedicle valve, after 



Hall & Clarke. 



13. Id. X 6. View of pedicle valve, after Hall & Clarke. 



14. Id. X 3. View of specimen with conjoined valves, figure by Greger 



from specimen from type-locality, Louisiana, Pike County, Mo. 



15. Etheridgina ? spondyliforinis White & St. John. Copy of the original 



figure. 



16. Etheridgina incondita s]). noY. x 4. Holotype. View of pedicle valve, 



specimen from Beaumont, Kansas. 



17. Id. X 4. View of pedicle valve, specimen from Cambridge, Kansas. 



18. Id. X 4. View of pedicle valve, specimen from Kansas City, Mo. 



On a New Ammonite Genus {Dayiceras) 

 from the Lias of Charmouth. 



By L. F. Spath, M.Sc, F.G.S. 

 (PLATE XV.) 



rpHE following account is based on the six specimens recorded by 

 -*- Dr. W. D. Lang in his paper on " The Ihex-zone at Charmouth, 

 and its relation to the Zones near it " ^. After mentioning the 

 occurrence, in the top of the zone, of an apparently new 

 Polymorphitid, Dr. Lang added the following footnote : "A 

 striking form, 3 to 4 inches in diameter, with numerous, very thin 

 costae. Two specimens were found (not in place) in the winter, 

 1915-16, by Lieut. Dan Haggard, who presented them to the 

 British Museum. The author found parts of three specimens in 

 place in the Pyritic Marls in June, 1916. A sixth specimen, the 

 best preserved of all, has been in the British Museum many years, 

 and is labelled ' Said to be from Lyme Regis '." 



1 F. R. C. Reed, " The Lower Palajoz. Trilobites of the Girvan district" : 

 Mon. Palseont. Soc, 190.3-6, pp. 146-7. 



^ Also ibid., pi. xix, fig. 2. 



3 H. Woodward, Geol. Mao., 1880, pp. 97-9. 



* L. Dollo, "La Paleontologie Ethnologique " : Bull. Soc. beige de Geol. 

 Mem , Bruxelles, Tome xxiii, 1909, pp. 406-17. See also H. H. Swinnerton, 

 Geol. Mag., Vol. LVI, 1919, pp. 108-9. 



^ Proc. Geol. Assoc, vol. xxviii, pt. i, 1917, p. 32. A seventh example was 

 found by Dr. Lang in May, 1920. 



