G. C. Crick — Note on Ammonites euomphalus, Sharpe. 255 



belonging to the group for which Grossouvre has proposed the 

 generic name Doiivilleiceras,^ the type species being Ammonites 

 mammillatus, Schlotheim.- It is evidently closely allied to the 

 Acanthoceras aberrans of Kossraat,^ who regarded that species as an 

 aberrant member of the genus Acanthoceras. That species appears 

 to be very rare, for only a single example is known, and that came 

 from the Middle Utatur Group of Odium, South India — a group 

 containing numerous Acanthoceras of the group of Bothomagense, 

 Defrance, and MantelH, Sowerby, as well as Turrilites costatus, 

 Lamarck, etc., and referred by Dr. Kossmat to th^ younger portion 

 of the European Cenomanian. Neumayr* referred the present species 

 to his genus Hoplites. 



There can, we think, be no doubt that this species is closely allied 

 to the genus Douvilleiceras, and we think it may be placed, at least 

 provisionally, in that genus. Sharpe's type-specimen came from the 

 Lower Chalk, Man of War Cove, on the coast of Dorset, but the 

 Cephalopoda occurring in association with it are not recorded. From 

 the bed in Devon which contained the example of this species 

 referred to by Messrs. Jukes-Browne and Hill, these authors record 

 the following Cephalopoda (the species marked S having been 

 collected either by themselves or by Mr. Rhodes for the Geological 

 Survey, and those marked M having been identified by Mr. Meyer 

 from specimens in his own collection) : — 



Helemnitella plena, Blainville 



N'autilus Fittoni, Sharpe ... ... ..^ 



,, Beslongchampsiaiius, D'Orbigny 

 Ammonites eiiomphahts, ShiU'im ... 



,, Goupilianiis, D'Orbigny 



,, hippocastanum, J. de C. Sowerby 



, , (?) leiitonema, Sharpe ... 



,, naviculavis, Mantell ... 



,, pentagonus, Jukes- Browne ... 



,, planulatus, J. de C. Sowerby 



,, Menevieri, Sharpe 



,, rothomagensis, Defrance 



Scaphites ceqicalis, J. Sowerby 



,, ,, var. obliqiius, J. Sowerby 



Turrilites Sechei, J . SiQ-werhy 



,, tuber culatus, Bosc 

 Samites simplex {^), 'D''OYhigMY ... 



SM 



S 

 M 



S 

 M 

 SM 

 M 

 SM 



S 

 M 

 M 

 SM 

 SM 

 M 

 M 

 M 

 li 



From the same block which yielded the example of Douvilleiceras 

 euomphalus referred to above. Dr. Rowe and Mr. Sherborn obtained 

 the following Cephalopoda, as well as one or two apparently 

 undescribed forms : — 



1 A. de Grossouvre, "Les Ammonites de la Craie superieure " : Mem. Carte geol. 

 detaillee de la France, 1893, p. 26. 



* E. F. V. Sclilotheim: Min. Tasch., vol. vii (1813), p. 111. 



^ F. Kossmat, " Untersuchungeu iiber die siidindische Kreideformation " : Beitr. 

 Pal. Geol. Osterreichs-Ungarn, etc., Bd. ix, Hft. 3 and 4 (1895), p. 202, pi. xxiv [x], 

 figs. ia-c. 



* M. Neumayr, " Uber Kreideammoniten " : Sitzb. d. k. Akad. d. "Wissensch., 

 "Wien, Bd. ixxi, Abth. 1 (1875), p. 685. 



