‘ 
138 PSEUDOCERATITES OF THE CRETACEOUS. 
NICKLESIA n. gen. Hyatt. 
This genus has a prolonged smooth stage, followed by a costated stage, 
in which the coste are without tubercles and cross the more or less rounded 
convex venter without becoming concave. In some species, as in the type 
[N. dumasiana], the venter does not become decidedly flattened at any 
stage and the cost are very slightly developed. The following species, 
described and fully figured by Nicklés in his Paléontologie du sud-est 
de Espagne, can be referred to this section of the genus: Nick. moltoi, 
levyi, nolant, lapparenti. 
In other species the venter becomes markedly flattened during the 
latter part of the smooth stage, and the following species, described by the 
same author, are referable to this section: Nick. zeilleri, mallade, bertrandt. 
NICKLESIA ALICANTENSIS n. sp. Hyatt. 
Pulchellia (Stol.?) pulchella Nicklés, 1890, Mém. Soc. géol. France, Paléontologie, 
No. 4, p. 13, pl. 1, figs. 10, 11. 
This differs from d’Orbigny’s species in having regularly dichotomous, 
more or less sigmoidal costz, a wider umbilicus, less compressed form, and 
broader venter. 
The following species can also be included under this head: Nick. 
karsteni (Uhlig)” (pulchellus of Karsten). 
NICKLESIA LENTICULATA n. sp. Hyatt. 
Pulchellia aft. pulchella Gerhardt, 1897, Neues Jahrb. fiir Min., Geol., und Pal., Beil.- 
Bd. XI, p. 154, pl. 3, fig. 9. 
D’Orbigny’s species has several short costes between the longer ones, 
and the internal sections between the longer costations are smooth, whereas 
in both of the above the coste are crowded together and cover the sides of 
the shells. 
NIckLEsIa DipayaNna (d’Orbigny). 
Nick. didayana (@Orbigny), another species of this group, has been 
often misapplied to species having channels on the venter and lateral 
tubercles. 
aMém. Soe. géol. France, Paléontologie, No. 4, 1890. 
» Wernsdorfer Schichten, Denkschr. K. Akad. Wiss., Wien, Vol. XLVI, 1883. 
