CEPHALOPODA FROM THE HOKKAIDO. 



17 



lateral lobe. Type: — G. limatum m}^ G. polilissimum Kossmat^^ 

 from the upper Trieliinopoly group of South India is a species 

 closely resembling this Japanese form. Lytoceras sp. of Schlüter'^^ 

 from the Senonian of Germany may also be cited as an ally of 

 the latter. 



IV. Subgroup of Gaudryceras derimanense Whiteaves. 



This embraces these Ammonites whose surface bears numerous 

 simple, equal, sharp libs in the full grown state. It is closely 

 related to the first subgroup, but is distinguished from it by the 

 absence of periodic ribs. Type: — G. denmanense Whiteaves 

 sp.,^^ once treated as L. JuTcesii? Sharpe^\ and considered by 

 Kossmat'''^ as identical with G. Kayei Forbes sp. G. Jukesii is 

 a species from the Senonian of England which was founded on 

 a single fragment. 



Y. Subgroup of Gaudryceras Sacya Forbes sp. 



A full grown shell shows many, very shallow and narrow, 

 transverse grooves separated by wide interspaces. The suture line 

 resembles that of the subgroup of G. tenuiliratum. Type : — G. 

 Sacya Forbes'' sp., the adult specimens of which were called by 



1) Vide p. 34. 



2) Kossmat: 1. c. p. 32 (128), PI. L (XV). figs. 7 a, b, c. 



3) Schlüter: Cephalopoden d. obereu deiitscken Kreide. P. 16, PI. XLII. figs. 6, 7. 



4) Whiteaves : On some Fossils from the Nanaimo group of the Vancouver Cretaceous. 

 1S95. P. 129, PL II. figs. 1-2. Note on a Supposed New Species of Lytoceras from the 

 Cretaceous Rocks at Denman Island. Ottawa Naturalist. 1901. Vol. XV. No. 2, p. 31. 



5) Whiteavks: Mesnzoic Fossils. Vol. I. Pt. 2, p. 119, PI. XIII. figs 3, 3 a, b. 



6) Kossmat: I.e. p. 125. 



7) Stoliczka: I.e. p. 154, PI. LXXV. figs. 5-7; PI. LXXVI. figs. 1-3.— White aves: 

 1. c. Vol. I. Pt. 1, p. 4;;, PI. II. figs. 2a,b,c, 3. Pt. 3, p. 203, PI. XXV.— Kossmat : 1. c. 

 p. 23 (119). 



