PSUEDOTISSOTIID®. ot 
marginal saddles. The other saddles are very long and phylliform, and 
according to Peron’s figures the third saddle is trifid or bifid. These 
sutures and the ventral lobe, with its steep denticulated sides and truncated 
siphonal saddle, are similar to the sutures of the old stage of Roemeroceras 
syriaciforme. The form and ornamentation also agree with this determina- 
tion, but the keel is more prominent than is usual in this genus. It is pos- 
sible to understand this form, if it is related to Ps. galliennei, because in that 
case the keel and lateral costee are similar to those of that species. The 
differences in sutures lie largely, according to Peron’s figure, in the second 
lateral saddles, which are entire. This may be due to retrogression. 
Locality: North Africa. 
Age: Santonian. 
CHOFFATICERAS un. gen. Hyatt. 
This genus has sutures similar to those of Pseudotissotia, but the form 
is distinct. The species are more or less stout gibbous forms with more or 
less open and deep umbilici. The sides are heavily costated and nodose 
along the umbilical shoulders, but there are no external tubercles according 
to Peron. He also describes the venter as having a continuous keel and 
two ventro-lateral ridges. The form is more involute and more compressed 
than Pseudotissotia, and the outer parts of the volutions have a tendency to 
become concave in the involute species with broad volutions. 
The type is C. meslei (Peron). 
SHOFFATICERAS BARJONAI (Choffat). 
Pseudotissotia barjonat Choffat, 1898, Faune Crét. du Portugal, Vol. I, 2d series, 
pl. 18, fig. 3; pl. 22, figs. 40-42. 
This species is a close ally of C. meslei of North Africa, as has been 
stated by Choffat, but has a more prominent keel and has no signs of 
channels on the venter. 
Locality: Portugal. 
Age: Vuronian. 
CHOFFATICERAS MESLEI (Peron). 
Pseudotissotia meslei Peron (pars), 1896, Mém. Soc. géol. France, Paléontologie, 
Vol. V1, No. 17, pl. 1, fig. 1; pl. 2, fig. 1 (not pl. 2, fig. 2, nor pl. 3, fig. 2). 
This species has a form which is sublenticular when seen from the 
front in Peron’s figure, owing to the great prominence of the umbilical 
