PULCHELLID. 141 
He has also traced some differences between the sutures of the different 
groups, but these are of such a nature that one does not get clear impressions 
from drawings, although those of Nicklés are remarkable for their excellence 
and full of instructive details. I unfortunately can not agree with these 
gentlemen with regard to Stoliczkaia. 
Neumayr® states “sehe ich mich genéthigt, eine Gattung fiir eine 
merkwiirdige kleme Gruppe von Ammoneen aufzustellen, niimlich, fiir die 
eigentiimlichen Formen der indischen Kreide, welche Stoliezka * * * 
beschrieben und mit den Hiallstatter Arcesten verelichen hat.” He then 
goes on to establish new names for the two Indian species considered by 
him to be distinet from Ammonites dispar VOrbigny, and the first of these, 
Stoliczkaia tetragona Neumayr or Amm. dispar Stoliczka,’ thus becomes the 
type of this genus. D’Orbigny’s figure and description of Amm. dispar 
shows a compressed involute shell with a volution in section like that of 
Nicklesia pulchella (?Orbigny), but the costee are narrow, and although 
they cross the venter they are quite distinct from those of this family. 
D’Orbigny’s species is an old shell of some other group, but is related 
neither to Pulchellia nor Stoliczkaia. 
Stol. tetragona has a quadragonal volution in section when full grown, 
venter depressed and slightly convex, sides same, umbilical zone abrupt and 
narrow. Ribs very prominent and sharp, reaching across the venter and 
side and having alternating shorter costz across the venter. Only one row 
of tubercles along the ventro-lateral angles in the young until in the neanic 
stage. These disappear in the adult. This is precisely the form and gen- 
eral aspect of some of the Mantelliceratide. For example, Amm. 
mantelli is either a member of this genus or a very similar parallel form. 
But none of these have costze or ornaments or channels like those of 
Mantelliceratide. Probably also the young are more or less distinct in 
development. 
Whether this last be true or not, the agreements of the adult sutures 
are not close enough to place such widely different structured shells as 
Stol. tetragona and Pulchellia pulchella in the same group, especially when 
there is close agreement between the latter and the younger stages of the 
typical P. compressissima and the suture lines are also similar. 
aZeitschr. Deutsch. geol. Gesell., Vol. XX VII, 1875, p. 931. 
d Foss. Ceph. Cret. Southern India, pl. 45, f. 2. 
