CEPHALOPODA FEOM THE HOKKAIDO. 



25 



1895. Lytocei^as Kayei Steinmann : Die Cephalopoden d. 



Quiriquina Schichten. Neues Jahrb. f. Mineral., 



Geol. und Palaeont., Beilageband X. p. 86, PI. Y. 



fig. 5 a, b. 

 1895. Lytoceras [Gaudryceras) Kayei Kossmat : 1. c. p. 162, 



PI. II (XVI), fig. 5 a, b ; PI. III (XVII), fig. 2 a, b. 

 Dimensions : — 



(1)r..o' 



(5) 



Ratio. 



0^) 



Diameter. 5.S5 cm. 



Height of 



the last I 1.85 „ 

 whorl. I 



Breadth of 



the last 1.80 „ 

 whorl. 



Width of 

 umbili- 

 cus. 



100 



h2 



4.00 cm. 100. 2.25 cm. 



1.20 „ 



31 1.35 



47 1.80 „ 



30. 0.G5 „ 



34. ! 0.75 



Ratio. 

 100. 



28. 



45. 



1.20 



53. 



(4) 

 2.10 cm. 



O.GO „ 

 0.70 „ 

 1.10 „ 



Ratio. 

 100. 



28. 



(5) 



2.?,0 



0.70 



1.20 „ 



100. 



1.2f>cm 

 0.30 „ 



0.50 „ 



0.70 „ 



(^^Ratio. 

 100. 



24. 



40. 



56. 



1). A specimen of G. Kayei from the Valudayur beds of 

 Pondicherry (after Kossmat). 



2). A specimen of var. ornata from the Pachydiscus-hediB of 

 the Kikumezawa (PI. III. fig. 2a,l)). 



3). A specimen of G. Kayei from South India (after Forbes). 



4). A specimen of G. Kayei from the Quiriquina bed of 

 Chili (after Steinmann). 



5). A specimen of var. ornata from the upper Ammonite 

 beds of the Ikushumbets. 



6). A specimen of G. Kayei from the Valudayur beds of 

 Pondicherry (after Kossmat). 



The specimen, Xo. 5, consists of seven volutions. The 

 umbilicus is very wide, being broader than one half of the whole 

 diameter of the shell, slightly covering the ventral portion of the 

 preceding volutions. Aperture subquadrate, broader than high ; 

 in older stages, becoming higher and laterally compressed. Surface 



