197 
adjoining principal lateral, which is longer than the lower 
lateral, and the columellar is small or absent. 
Genus Puyiuoceras, Suess.—Shell discoidal, highly involute, 
covered with very fine strie, which describe graceful forward 
bent lines (fig. 49). Body-chamber short, mouth-border simple, 
with lateral forward directed lappets. Lobes numerous, and 
very complicated, as many as eight or nine on each side. 
Saddles bladder-shaped and well rounded (fig. 50); body- 
chamber widely expanded and fan-shaped, with undulating 
radiations in Phylloceras heterophyllum. Hx. (see Plate of this 
species in my monograph on the Lias Ammonites). 
Fic. 48.—Disposition of the lobes Fic. 49.—Phylloceras heterophyllum, 
(D,L, L’, a) in Phylloceras hetero- Sow. Side view, showing the lines 
phylum. of growth, 
Fa: 50.—Disposition of the lobes and saddles (D, L, L/, 4) 
in Phyll. heterophyllum, Sow. 
