ACinropoEi. 
19 
is shown in Fig. 15. The specimen is in a more advanced stage; 
it is elliptical in shape and measures 2*5 by 3*5 mm. in diameter; 
the fasciculi are beginning to develop, being separated by radial 
grooves covered by an epizoarial layer. 
D. 3462. 
D. 3512. 
D. 3451. 
60,155. 
D. 3039. 
D. 3339. 
D. 3428. 
D. 3429. 
D. 3452. 
D. 3453. 
D. 3461. 
D. 3463. 
D. 3464. 
D. 3465. 
D. 3466. 
D. 3500. 
D. 3505. 
LIST OF SPECIMENS. 
Twenty-one simple zoaria, some with a small peduncle oyergro^^^l by the 
lateral outgrowth of the disc : also two slides with thin horizontal 
and vertical sections. ^Maastrichter Kalk. Maastricht. Van 
Breda Coll. Fig. 12, p. 17. 
A tube ■sWth thirty zoaria, and a sHde with a thin horizontal section. 
Maastrichter Kalk. Maastricht. Van Breda Coll. The horizontal 
section is figured as Fig. 13, p. 17. 
A compound zoarium, with two young colonies attached to the basal 
colony. Maastrichter Kalk. Maastricht. Van Breda Coll. The 
two young colonies are shown in Figs. 14 and 15, p. 18. 
A box with about thirty-five compound zoaria, with the bases often 
concave. Maastrichter Kalk. ^laastricht. Van Breda Coll. 
Four zoaria of the variety with flat base and high radial ridges, and 
therefore the typical shape of Actmopora diadema. Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
Twelve simple zoaria, 6 mm. dia. by 2 mm. thick. Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
Two attached zoaria, of which one is the var. michelini. Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
One zoarium with well-raised unworn ridges which expand towards 
the centre, so that they are fusiform or somewhat clavate in shape. 
Maastrichter Kalk. Maastricht. Van Breda Coll. 
A group of three confluent zoaria of var. michelini (on slide). 
Maastrichter Kalk. Maastricht. Van Breda Coll. 
A zoarium (on slide) of a variety with long ridges which reach to 
the centre ; ridges multiserial. Maastrichter Kalk. Maastricht. 
Van Breda Coll. 
Three simple zoaria. Maastrichter Kalk. Maastricht. Van Breda 
Coll. 
Four simple zoaria. Maastrichter Kalk. Maastricht. Van Breda 
Coll. 
Three compound zoaria. Maastrichter Kalk. Maastricht. Van 
Breda Coll. 
Ten compound zoaria. Maastrichter Kalk. ^[aastricht. Van 
Breda Coll. 
Twenty zoaria, including some compound forms (in tube). Maastrichter 
Kalk. Maastricht. Van Breda Coll. 
A very w'orn zoarium (on slide). Maastrichter Kalk. ]\faastricht. 
Van Breda Coll. 
A young zoarium with the bundles rising into spikes (on slide). 
IVIaastrichter Kalk. Maastricht. Van Breda CoU. 
