HEINZIID®. 133 
the same markings as on the cast. The young is much flatter and increases 
faster in the abdomino-dorsal diameters than in other species of Heinzia and 
remains smooth until a later age. The tubercles appear also later on the 
venter, and there is a flat ventral zone for a more prolonged stage than in 
H. provincialis, and the yentral channel appears later. The umbilical 
tubercles appear on the last volution figured and are at first single. Then 
they probably become [double] by the development of two other rows of 
tubercles near the ventral lines, but this was not actually seen on the 
specimen. 
Locality: Escragnolles, France. 
Age: Barremian. 
HEINZIA OUACHENSIS (Coquand). 
Pulchellia owachensis Sayn, 1890, Ann. Soc. d’Agriculture de Lyon, 6th series, 
Vol. II, p. 157, pl. 1, fig. 15 (not fig. 14). 
This species, described as a Pulchellia by Sayn, is an involute com- 
pressed form probably in the same genetic group with H. matura. This is 
shown by the ventral channel and costs and tubercles on the umbilical 
shoulders. It has not the broad double terminations of the costze observed 
in H. matura. Fig. 15 is probably a true Pulchellia, and is cited under that 
generic name as P. kiliani. 
Locality: Djebel-Ouach, North Africa. 
Age: Barremian. . 
CARSTENIA n. gen. Hyatt. 
This remarkable group has, as shown by Karsten’s figure of Carstenia 
lindigi in the latest neanic or early ephebic stage, coarse costee with double 
terminations becoming dichotomous at the middle lateral line and having a 
line of nodes at their junctions. These are continued later on the singie 
costee when these appear. The arising of the double line of outer tubercles 
close together on the ventral line is also shown in this figure. The form is 
stout in the type mentioned above and similar to that of Heinzia provincialis, 
but in the Carstenia (Amm.) caicedi Karsten it is more involute and com- 
pressed. The ventral furrow in Carstenia lindigi in the young is narrow 
and similar to that of Heinzia, but later it broadens and becomes similar to 
