40 PSEUDOCERATITES OF THE CRETACEOUS. 
HEMITISSOTIA TISSOTIEFORMIS Peron. 
Hemitissotia morreni var. tissotieformis Peron, 1897, Mém. Soc. géol. France, 
Paléontologie, Vol. VII, No. 17, pl. 15, figs. 3-5 only. 
This is a much stouter form with stouter volutions, and as might: be 
expected in such a species the young exhibits distinct ribs. Hemitissotia 
morrent var. coquandi (pl. 15, fig. 6) may be distinct, but no front view is 
given and the sutures shown in pl. 18, fig. 14, do not appear to be very 
different. 
Locality: North Africa. 
Age: Senonian. 
HEMITISSOTIA DJELFENSIS (Peron). 
Tissotia djelfensis Peron, 1897, Mém. Soc. géol. France, Paléontologie, Vol. VII, 
No. 17, pl. 16, figs. 3, 4. 
Buchiceras ewaldi (pars) Peron, 1890, Moll. Crét. de la Tunisie, pl. 15, figs. 7 and 9 
(no others). 
This is a compressed shell very closely allied to Paratissotia ficheuri in 
aspect, but differing in the sutures. These have the first lateral saddles 
narrow and bifid as in Hemitissotia and the first lateral lobe is large as in 
that genus. he figure of the highly compressed cast given by Peron as 
part of his ewaldi in the Mollusques Crétacé de la Tunisie has very similar 
sutures so far as the deep division of the first lateral saddles and lobes is 
concerned. It is better to quote it here, since it is undoubtedly not related 
to the other species on the same plate and has also a form similar to that of 
djelfensis. 
Locality: North Africa. 
Age: Lower Senonian. 
HEMITISSOTIA CEADOUROENSIS Choffat. 
Hemitissotia ceadouroensis Chofiat, 1898, Faune Crét. du Portugal, Vol I, 2d series, 
pl. 20, figs. 7-10. 
This species is apparently a member of this genus and is of interest 
in showing the old-age transformations, the rounding of the venter and 
contraction of the outer volution. If the last part of the last volution is 
perfectly natural, it shows an extraordinary senile scaphitoid deviation from 
the spiral. 
Locality: Portugal. 
Age: Senonian. 
