142 PSEUDOCERATITES OF THE CRETACEOUS. 
The keeled smooth forms were also referred by Douvillé and Nicklés 
and by myself in Cephalopods of Zittel’s Text-book under the name of 
Psilotissotia to Tissotide, but I am now satisfied that this is an erroneous 
view of their true affinities, and they are bere retained in the Pulchelliide. 
PULCHELLIA NICKLEsI n. sp. Hyatt, 
, 
Pulchellia compressissima Nicklés, 1890, Mém. Soc. géol. France, Paléontologie, 
No. 4, p. 8, pls. 1 and 3. 
This species is now, thanks to the drawings and descriptions of Nicklés, 
sufficiently well known so far as the neanic and ephebic stages are con- 
cerned, and it is not venturesome to say that in the still younger stages 
the venter must have been rounded and smooth like that of the group here 
named Psilopulchellia. The true P. compressissima WVOrbigny is a much 
thinner shell, with broader costze and narrower venter, the costal folds on 
the venter narrower and less deeply channeled. Doubtless the young are 
correspondingly distinct. The umbilicus is also narrower. Pulchellia schlum- 
bergeri Nicklés, Mém. Soe. géol. France, Paléontologie, No. 4, p. 38, pls. 7 
and 8; Pul. columbiana (compressissima Gerhardt), also figured by d’Orbigny 
as the young of his dmm. galeatus in the Voyage dans PAmerique mérid- 
ionale, Pul. selecta, and Pul. hettneri also belong to this genus. 
Age: Barremian. 
There are two species described from Djebel-Ouach by Sayn, Pul. 
changarniert Sayn and Pul. kiliant n. sp. (Pul. (Heinzia) ouachensis, Sayn," 
pars). This last is distinct from Heinzia ouachensis Sayn in not having an 
inner line of tubercles and in its narrower ventral channels as well as in its 
sutures as described by Sayn. 
PULCHELLIA ComPREssissIMa (d’Orbigny). 
Pl. XVH, figs. 9-12. 
Ammonites compressissimus VOrbigny, 1840, Terr. Crétacé, pl. 61. 
This species is very peculiar and altogether distinct from the forms 
usually placed under the same name by authors generally. D’Orbigny’s 
figure is very similar to a specimen of the Krantz collection from Escra- 
enolles, the same locality as the shell figured by @Orbigny. The form of 
this cast is quite as much compressed and involute, the coste are present 
a Ann. Soe. d’ Agriculture de Lyon, 6th series, Vol. III, 1890, p. 155, pl. 2, fig. 15, not fig. 14. 
