HIND : TEMNOCHEILUS DERBIENSIS. 
19 
chielus coronatus which also has a much more convex umbihcal slope 
and the peripheral margin less angular. 
Judging' from the figure of the Visean specimen of Nautilus latus 
figured by de Koninck (Op. supra cit.) I think it is identical with my 
specimen. A", latus was described and figured by Meek and Worthen 
and their type is from Illinois, N. America. Comparing their figure 
(Geol. Surv., Illinois, Vol. V, PL 30, Figs. 2, a, b), it is much less trans- 
verse and the whorl not so deep as in the Belgian specimen and I doubt 
whether the latter is correctly referred to Meek and Worthen's species. 
The American specimen is stated to consist of " half of one volution " 
and to be " unseptate." 
