PULCHELLUD ®. 139 
NickLesia pumasiana (d’Orbigny). 
Pl. XVI, figs. 6-8. 
Ammonites dumasianus VOrbigny, 1842, Voyage dans Amérique méridionale, Vol. 
IGUE Foy EE Fall alte 
This species is fully figured by d’Orbigny, and easily recognizable in 
case of large specimens. The French specimens that usually bear this name 
have been retained here with a question mark. The three examples that 
are in the Museum of Comparative Zoology are much smaller than the 
figures of the South American species, but are otherwise identical, and there 
are no young forms of the latter for comparison. The young specimen 
figured shows the development of the generic cost directly from a form 
with a rounded venter, without the intervention of a flat or concave venter. 
Locality: Colombia, South America; Escragnolles, France. 
Age: Neocomian. 
SUBPULCHELLIA n. gen. Hyatt. 
This becomes a distinct generic group, consistently with the principles 
advocated in this and other papers, because it represents a distinct grade in 
the evolution of the Pulchelliidz. Its permanent adult characteristics cor- 
respond to those of the transient condition of the neanic stage in the young 
of Pulchellia. Subpulchellia oehlerti (Nicklés) has a smooth involute shell, 
with a concave ventral area bordered by two ridges. The venter on casts 
is usually flat and has no definite ridges. 
The genus includes also Subp. fouquei (Nickles), and Subp. sauvageauw 
(Nicklés.) 
Subp. sauvageawi (Sayn) has lobes and saddles quite different from the 
Spanish form as figured by Nicklés, but whether it or Nicklés’s species 
is identical with Hermite’s it is not possible to state. Hermite’s original 
description and figure give no sutures. The shell as described in correction 
of the figure” has slight costations, present also in Sayn’s, as described but 
not as figured, and not mentioned at all in Nicklés’s description. The 
sutures of Nicklés’s specimens, one from near Constantine, Africa, and the 
other from Spain, are similar, but entirely distinct from those of Sayn’s 
figure. Until the suture of Hermite’s original or of a specimen from the 
«Hermite, Etudes géol. sur les Iles Baléares, Vol. I, 1879, p. 315, pl. 4, figs. 4, 5. 
