CLAPP AND SHIMER: SUTTON JURASSIC. 435 
to the ventral shoulders and run straight across the venter. On the 
venter the ribs are depressed by a slight furrow; this depression of the 
ribs accentuates their height on the ventral shoulders into the ap- 
pearance of low knobs bordering the furrow. 
Lobes and saddles entire, except that the ventral lobe is divided 
by a small siphonal notch. There are two narrow lateral lobes, the 
second lateral being about two thirds the depth of the first. The 
three saddles are much broader than the lobes, the first saddle being 
very deep. Internal antisii^honal lobe not as deep as the second 
lateral. 
Height of cross-section, 4.7 mm.; breadth of cross-section, 3.5 mm. 
Unlike the type, C. marshi Hauer, from the Rhaetic, but like most 
of the other species placed in this genus, this species lacks the slight 
division in the first lateral lobe, all the lobes except the siphonal 
being entire. 
Named from the formation. 
Comparison. — This species is apparently most closely related to 
C. subrhaeticum Mojsisovics.^ It agrees with this in size and pro- 
portion, in its loose coiling, in having strong, simple ribs interrupted 
on the venter by a furrow leaving knobs on each side. Its suture is 
likewise similar. It differs in having the saddles proportionally 
somewhat broader and the antisiphonal lobe deeper. This latter is 
almost as long as the adjoining second lateral lobe, instead of being 
only one third its length as in this species (as shown in Fig. Sd, Tafel 
134). It differs likewise in not having fine striae parallel to the ribs. 
C. subrhaeticum is found in the Rhaetic formation of Central Europe 
(Hallstatter Kalke). 
Externally this species agrees closely with Polycydus nocUfer Hyatt 
and Smith.- That species, however, is more closely coiled and the 
second lateral lobe is exceedingly small and the first lateral lobe is 
sometimes ceratitic. The third lateral saddle is likewise minute. 
P. nodifer occurs in the Upper Triassic, zone of Tropitcs suhhullatus, 
Shasta Co., California. 
The fauna includes besides the species described above many very 
poorly preserved fossils, — simple cup corals (r^), other encrusting 
1 E. Mojsisovics. Die Cephalopodea der Hallstatter Kalke. AbhancU. k. k. geol. 
Reichsanstalt. Wien, 189.3. vol. 6, pt. 2, p. 563. 
= A. Hyatt and J. P. Smith. The Triassic Cephalopod Genera of America. U. S. 
Geol. Surv., Prof. Paper 40, 1905, p. 201. 
3 c = very common; c = common; r = rEire; i? = very rare. 
