'Z56 
D. 3434. 
D. 3435. 
D. 3436. 
D. 3437. 
D. 3438. 
D. 3439. 
D. 3440. 
3). 3441. 
3). 3442. 
B. 3443. 
B. 3444. 
B. 3447. 
B. 3450. 
B. 3460. 
B. 3472. 
B. 3501. 
B. 3504. 
B. 3506. 
B. 3507. 
HADIOPORID^. 
larger is 6 mm. in diameter by 4 mm. thick, but has indication of 
radial groups. The smaller is 5 mm. in diameter and 3 mm. thick. 
Maastrichter Kalk. Maastricht. Van Breda Coll. 
Five small zoaria (on slide). Maastrichter Kalk. Maastricht. Van 
Breda Coll. 
Two zoaria, elliptical in horizontal section; one is 4-5 ram. long by 
2-5 mm. across, and 6 mm. high (on slide). Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
A regular zoarium (on slide), 10 ram. diameter and 4 nun. high, having 
a large deep central depression with vertical walls 1 mm. high, and 
a flat floor 2 mm. in diameter. Maastrichter Kalk. Maastricht. 
Van Breda Coll. 
Two zoaria ; both are undergoing flssion ; the one most advanced 
in fission is 9 mm. long by 6 mm. at maximum width, and 
constricted to 5 mm. across ; it is 3 mm. high. ^Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
A specimen of the normal form, attached to which is a young specimen 
in the cariosa stage (on slide). Maastrichter Kalk. Maastricht. 
Van Breda Coll. 
A small regular zoarium of the turbinate variety, 5*5 mm. in diameter 
and 4 mm. high. Maastrichter Kalk. Maastricht. Van Breda Coll. 
Three zoaria 
Breda Coll. 
(on slide). 
Maastrichter 
Kalk. 
^Maastricht. 
Van 
Three zoaria 
Breda Coll. 
(on slide) . 
Maastrichter 
Kalk. 
Maastricht. 
Van 
A zoarium after the cariosa stage, with the traces of the radial bundles 
well shown. Maastrichter Kalk. Maastricht. Van Breda Coll. 
Tube and eighteen zoaria of pedunculate form. Maastrichter Kalk. 
Maastricht. Van Breda Coll. • 
Fifteen zoaria. Maastrichter Kalk. Maastricht. Van Breda Coll. 
A large zoarium, 10 mm. high, 10 mm. diameter, with a worn flat 
upper surface and a pointed base. Maastrichter Kalk. ^ Maastricht. 
Van Breda Coll. 
Eighty-nine zoaria of the variety with a pointed base. Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
A zoarium with tooth-shaped elevations instead of ridges (on slide). 
Blunt peduncle. Maastrichter Kalk. Maastricht. Van Breda Coll. 
Two zoaria (on slide). Maastrichter Kalk. Maastricht. Van Breda 
Coll. 
A zoarium more worn than in B. 3442, having a flat upper surface on 
which there is only a faint trace of radial structure. Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
An oval zoarium (on slide). Maastrichter Kalk. Maastricht. Van 
Breda Coll. 
Two zoaria (on slide). Maastrichter Kalk. Maastricht. Van Breda 
Coll. 
Three zoaria of var. fusiformis, with the bundles rising into spikes (on 
slide). Maastrichter Kalk. Maastricht. Van Breda Coll. 
