38 ART. 2. H. YAlîE : CRETACEOUS 



species of Gaiidryceras. On this account, it was placed l)y 

 Naumann and Whiteaves in tlie genus Phylloceras,^^ while 

 KossMAT treated it as Pseudopli y lilies^'' a new subgenus of Lyio- 

 ceras ; but the writer is at present not in a position to advance 

 any opinion on the matter. 



In common with the preceding S2^ecies and (/. Rouvillei 

 Grossouvre,"^ Gaudryceras Yokoyamai has fine striœ traversing the 

 ventral side, bending neither forward nor backward, but running 

 always straight. The small specimens of G. Yokoyamai and G. 

 limatwii are liable to be confounded with one another, but those 

 of the former possess higher whorls and a narrower umbilicus 

 than those of the latter. G. Rouvillei from the Santon ien of 

 Southern France is too small for a closer comparison, but it seems 

 to be distinguished from the young of the Japanese species by 

 its deeper involution. 



Localities and Horizon: — In pebbles from the Yubarigaw^a and 

 the Ikushumbets. Found also in the Fachydiscuü-hedn along the 

 Kikumezawa, a left tributary of the Ikushumbets. 



GAUDRYCERAS YAMASHITAI m. 

 PI. IV., fig. 7. 



Only two immature specimens of this species Avere found, 

 the laro'er of which measures : — 



Diameter. 8.8 cm. 100. 



Height of the last whorl. 4.4 „ 50. 



1) Whiteaves: On some Foss. Nanaimo group Vancouver Cret. p. 129. 



2) Kossmat: 1. c. p. 41 (137). 



;i) Guus^ulvuk: 1. e. !>. 228, PI. XXXVII. figs. 7 and 10, 



