40 AET. ?. — H. YABE : CRETACEOUS 



SUBGROUP OF GAUDRYCERAS SACYA. 

 GAUDRYCERAS sp. 



The writer lins seen only a single fragment of an Ammonite 

 wliieli i^i referable to the subgrouj^ of G, Sacya. This fragment 

 1)eing a ]>art of the Ix^ly chamlier of an adult specimen, no- 

 thing can be said about its general shape and suture line. But 

 the surface with narrow flexnous furrows is quite similar to that 

 of G. Sacya figured by Sïoliczka^- and Whiteaves."^ The space 

 l)etween two successive furrows measures above 1.2 cm., while the 

 fui'i-ows themselves measure al)Out 0.3 cm. in breadth on an 

 avei'age on the ventral side ; ]»esides there are nimierous fine 

 stria' covering tlie entire surface of the shell. 



Tlie specimen is too imperfect for exact determination, l)ut 

 its resemblance to G. Sacya is so great that there is hardly any 

 doubt of its representing a form closely related to, if not actually 

 identical with that species. 



Locality ; — A specimen, found in the collection of Jimeo, is 

 in a marly nodule from Ishuikarushihara, on the Penkeohoshikep, 

 a l)rauch of the Teshiogawa. 



Horizon : — leiden own. 



1) Sioliczka: I.e. p. 154, PI. LXXV., fio-. 7. 



2) WiliTEAVEs: Mesnzoic Fossils. Vol. T. I'l. ;'.. P. 20."., P]. X.W. 



