8 ART. 2. H. YABE : CRETACEOUS 



forms such as TurrUites, Hamites and Baculites. Associated 

 with these forms, there is still a larger group of Ammonites of 

 the same stock, which are especially numerous in the Indo- Pacific 

 Cretaceous deposits. These Ammonites, which possess closely coiled 

 and more or less deeply involute volutions, early attracted the 

 attention of Victor Uhltg,'' who was the first to call them the 

 " Group of Lyloceras Sacya " and who thought that all of the 

 upper Cretaceous Lyloceras might belong to this group. In 1894, 

 A. DE Grossouvre"^ proposed the new generic name Gaudryceras 

 for these Ammonites. Kossmat^' who had an opportunity of 

 examining better materials of these Ammonites, separated from 

 Gaudryceras two other types under the names of Tetragonites 

 and Pseudophylliies, and considered these three as subgenera of 

 Lyloceras. More lately, Alpheus Hyatt^^ j^^^^ed them in his 

 second family Tetragonitid» in the suborder I^eptocampyli. 



Besides these three geologically young types, remnants of another 

 type of Lyloceras, of the Jurassic and lower Cretaceous formations, 

 have also been found in the South Indian Cretaceous fxuna, and 

 in that of nearly the same age on the Pacific coast of North 

 America. They are the Ammonites of the group of Lyloceras 

 fimhi'ialum, or of Lyloceras in the most restricted sense. 



Among these several types of the upper Cretaceous Lyloceras, 

 there is a monotypic genus called Pseudoj)hylliles, which at present 

 has only one species, P. indra. This species has a very wide dis- 



1) V. Uhltg : Benieikungen z. Gliederung karpatischer lUldmigen. Jahrb. d. k. k. 

 geol. Reichsanstalt. Ed. XLIV. lieft 2. 1894. P. 217. 



2) A. DE Grossouvre : Reclierches sur la Craie supérieure. II partie. Les Ammonites 

 de la Craie supérieure. Mémoires pour servir à l'explication de la carte géologique dé- 

 taillée de la France. 1893. P. 225. 



3) Fr. Kossm4.t: Untersuchungen über die südindische Kreideformation I. Beiträge 

 z. Palacontologie u. Geologie Österreich-Ungarns u. d. Orients. Bd. IX. 1895. P. 17 (113). 



4) Alphkus Hyatt: Cephalopoda in Zittel's Text Book of Palaeontology. 1900. 



