A COXTRIlirïlON TO THE GENUS FUSULINA. 



11 



Kiuslifi ; but tluis l';ir tliciu is no evidence of its occurrence in 

 Hokkaido (Yesso) and the Kurils (Chishima) in the north, or in 

 Formosa (Taiwau) and the Loo-choo (Riukiu) in the south. 

 Nothing is known at present of its occurrence in the southern 

 half of 8aghalien (Karafuto). Ahnost invariably the species of 

 FusuUmi are found in limestone, but there is a single instance of 

 its occurrence in a slate, (as in * Auerniggschichten ' of the Garnie 

 Al[)s), at jMaiya, prov. Kikuzen, where the slate undei-lies the 

 FusuUna-WmQ^iowii. 



The poverty of other fossils in /^^^^s^t/ma-limestones excepting 

 crinoid remains seems to be a character not only peculiar to Japan 

 and China, but also to the rest of the world. The limestones 

 contain a rich fauna of Brachiopoda, with which Cephalopoda are 

 rarely associated, only when Fusulina is present in very small 

 numbers. They, no doubt, are a littoral formation, and this is 

 the reason why Cephalopoda are also almost always lacking in the 

 Japanese Anthracolitic fauna.^^ 



1) Tlie Japanese Antliiacolitic Cepha- 

 lopoda which are now known me are only 

 three. Of these two leing qnite imper- 

 fect in preservation but one deserves some 

 notice. Tliis is moreover very incomplete 

 being in the state of a cast. The shell is 

 small, diameter measuring 2.") mm., with 

 a large umbilicus and broad whorls, deeply 

 covering the inner ones. The ventral side 

 is broadly rounded, the whorls being 

 lunnlar in cross section. No periodic 

 grooves are impressed on tlie cast. The 

 suture lines are beautifully shown ; they are rather distant, simple and very characteristic, 

 composed of two saddles and two lobes on one side of the shell. They may belter lu- under- 

 stood from the annexed woodcut in four times the natural size. From this and otiicr characters, 

 I consider it to belong to a species of Crcistriocerns. 



The specimen, mentioned above, is from Omi, Nislii-kubiki-göri, prov. Kchigo, and 

 comes in association wilii Fruduclua cfr. spiralis Waag., b'pirij'er cfr. üldhamiüiius Waaü., 

 P. cfr. undalus Dkfr., Marlinia ? sp. and Schuugeiinu Verbeeki GeUs'UZ. 



