78 
KAUTILOIDEA. 
of Bohemia. This has slightly embracing whorls, of which the 
dorsal side is broader than the peripheral. The whorls enlarge 
somewhat rapidly, and there is a central perforation of considerable 
size. 
It should be mentioned that Professor Hyatt finds in the “ Group 
of Nautilus opTiioneus’^ of Waagen’ {=Pselioceras, Hyatt a very 
Fig. 10. 
Barrandeoceras Bohcmicum. — a, lateral view, the broken parts restored with a 
dotted line ; the body-chamber begins at the gap on the left of the figure ; 
h, peripheral view. Drawn from a specimen in the Collection. About 
one half natural size. 
close resemblance to the adults of Barrandeoceras natator. Bill., 
especially “ in the sutures, and form of the larval and adolescent 
stages of the former.” He observes, however, that Waagen’s species 
“ also resemble the genus Discites in general aspect, during the later 
adolescent and adult stages.” 
^ Mem. Geol. Surv. India. — PaljEont. Indica— ser. xiii. Salt-Eange Fossils, 
1879, vol. i., Productus-limestone Fossils, p. 46. 
^ Proc. Boston Soc. Nat. Hist. 1883, vol. xxii. p. 299. 
