CEPHALOPODA FROM THE HOKKAIDO. ol 



No matter to what family our genus belongs, it is, undoubtedly 

 one of the most important groups of Ammonites for strati graphical 

 purposes, as though much restricted in the number of species its 

 geographical distribution is very wide. 



The type of the genus is H. Gardeni Batly sp.,^^ recognized 

 in the Cretaceous (horizon f. of Griesbach) of Natal in South 

 Africa, the Ariyalur and Trichinopoly groups of South India, the 

 Nanaimo group (Horizon B of Richardson) of Vancouver, and 

 the Cretaceous of the Hokkaido. To the same species, an Am- 

 monites from the Cretaceous of Tunis has lately been referred by 

 Pervinquiere-' although with some doubt, and Ammonites sidcatus 

 Kner'^ from Galicia is by some palseontologists taken as a syno- 

 nym of H. Gardeni. If the above determinations are correct, 

 then it is a cosmopoliton species of the upper Cretaceous Am- 

 monites. 



According to Grossouvre and Kossmat, this genus also in- 

 cludes Ammonites remhda Forbes, Amm. pseudoffardeni Schlüter, 

 H, Fayoli Gross, and -H. ^yelsc^li Gross. H. rembdaf^ occurs in 

 the Valudayur bed of South India, the Cretaceous of Natal 

 (horizon d) and ]Madagascar^^ while Amm. pseudogardeni^^ is found 

 in the zone of Scaphites binodosus of the German Cretaceous. 

 Amm. j)seudogardeni var. nodotum ScHLtJTER'^ from Braunschweig 



1) Vide p. 32. 



2) L. Pervixquikee: I'n facies particulier du Sénoinen de Tunise. 1895. (Bv review), 

 o) Favre: Descrip. des Mollusques foss. la craie des environs de Lemberg 1869. P. 12, 



pi. IV., %. 7. 



4) Stoliczka: Foss. Cepli. Cret. Rock South India. P. C^, pi. XXXIII., fig. 5; pi. 

 LXXI., fig. 9. Griesbach : Geol. of Natal. P. 63, pi. III., figs. 2, 3. Kossmat : Unters, ii. d. 

 Südind. Kreidefom. P. 124, pi. XVIII., fig. 9. 



•5) Grossouvre: Sur quelques Fossiles Crétacés de Madagascar, p. 378, 1899. 



6) Schlüber: Cephal. d. oberen deutsch. Kreide, p. 54, pi. XVI., figs. 3-6. 



7) Schlüter : Podocrates im Senon von Braunschweig. Zeitsch. d. deut. geol. Gesell. 

 Bd. LI., p. 411. 



