30 ART. 2. — H. YABE : CRETACEOUS 



smaller ones. The external and lateral saddles are unequally 

 bipartite and especially so in the former, so that it may more 

 properly be called tripartite ; the lateral lobe is also broad and 

 tripartite, and about as long as the external one. The siphonal 

 saddle is relatively high and broad, being inflated at the top. 

 Tiie auxiliary saddles and lobes rapidly diminish in size and 

 hang obliquely toward the umbilical suture. 



Karl v. Zittel^^ treats Hauer iceras, Desmoceras, Puzosia 

 and Pachydiscus under the family of Desmoceratidie, while Gros- 

 souvRE"^ brings them together with Schlüteria under the family 

 of Phylloceratidœ. Al. Hyatt''^ includes them, with the excep- 

 tion of Pachydiscus, in the family of Haploceratidic. However^ 

 the general character of Hauericeras in its developmental stages 

 differs slightly from Phylloceratida?, being on the contrary closely 

 allied to the typical Desmoceras, and therefore the writer is at a 

 loss to see wdiy Grossouvre included it among the Phylloceratidit. 



As is generally accepted by palaeontologists, Hauericeras has 

 a close affinity to the group of Desmoceras Sugata Forbes and 

 also to the genus Puzosia Bayle, the resemblance to the former 

 beino- in its ventral keel, and to the latter in the suture line. 

 The Avriter himself also at first adopted the same view, but a 

 further examination of the specimens from the Hokkaido led him 

 to think that the latter belonged rather to the family of Phyllo- 

 ceratidse than to Desmoceratidie. He, of course, thinks it scarcely 

 safe to determine their taxonomic position on such an external 

 resemblance, and this question, consequently, may be treated, in 

 some detail, in the later part of this memoir. 



1) Zittel: Griindziige d. Palteontologie 1895. * 



2) Grossouvre: 1. c. p. ]6r>. 



.".) Hyatt : Cephalopoda in Zittel's Text Book of Palpeontology translated by Eastman.. 

 1890. P. 569. 



