611 
oceur very rarely in the rock, and that the Nummulites are far 
superior in number. The Alveolinae are very remarkable. They 
must undoubtedly be called a plain type. Their shape is quite 
irregular, it adapts itself entirely to the interspaces left by the Num- 
mulites in the rock; the Alveolinae fill up the spaces between the 
‘idiomorphous” Nummulites, so to say, in an “allotriomorphous” 
shape. (Fig. 1 and 2). Since the latter never present any marked 
deformations, it is not-admissible to assume that the deformations of 
Alveolinae have originated through mountain-pressure, after the 
animals died off. Most likely these deformations are the result of a 
stunted growth; the Alveolinae grew at the bottom among dead 
Nummulitie shells, and had to conform their shapes to the surroundings. 
Nummulites seem to be of various species. For the greater part 
they are small species (horizontal section 4—5 mm., vertical section 
14—2 mm.), which have only about 6 whorls. Skeleton-columns are 
not numerous; where they do present themselves, they are always 
conical. Sometimes we note a central tubercle. The septal bands 
seem to be radial, wavy lines. 
These Nummulites seem to belong to the group of N. Bagelensis 
Fig. 1 
Verneuk. Besides these also larger forms occur (diameter more than 
10 mm), whose septal bands are sparingly covered with tubercles. 
This limestone contains but few quartz-splinters. 
