. Bulletin. Natural history; Natuurlijke historie. DESCRIPTION OF GENERA AND SPECIES 83 plate. A section of the calyx showing the number and arrangement of the hydro- spires is shown in text fig. 29. Distribution. Most of the specimens in the collections were found in the lower half of the formation. However, two have been found in the upper half. Localities and horizons as follows: 4-(32), (14); 8-(57); 17-(62); 19-(19), (52), (61); 21-(25); 36-(105); 39-(103), (91), (121); 44-(133); 48-(108); Figure 29. Section of the calyx of Troosticrinus reinwardti (Troost) showing hydrospires (x 8).
. Bulletin. Natural history; Natuurlijke historie. DESCRIPTION OF GENERA AND SPECIES 83 plate. A section of the calyx showing the number and arrangement of the hydro- spires is shown in text fig. 29. Distribution. Most of the specimens in the collections were found in the lower half of the formation. However, two have been found in the upper half. Localities and horizons as follows: 4-(32), (14); 8-(57); 17-(62); 19-(19), (52), (61); 21-(25); 36-(105); 39-(103), (91), (121); 44-(133); 48-(108); Figure 29. Section of the calyx of Troosticrinus reinwardti (Troost) showing hydrospires (x 8). Locality 8-(57). 17509. PHYLUM COELENTERATA Class ANTHOZOA Subclass ScHizocoRALLA Okulitch, 1939 Genus Plasmopora Edwards and Haime, 1849 Plasmapora follis Edwards and Haime Plate XIII, figs. 1-4 Plasmopora follis Edwards and Haime, 1851 (p. 223, pi. 16, figs. 3, 3a; Roemer, 1860, p. 24, pi. 2, figs. 6, 6a). Description. The corallum of this species is variable although it tends to be pyriform, expanding upwards from a small base. Its size is also variable, the largest specimen in the collection (pi. XIII, fig. 1) measuring 65 mm. from base to top and having a diameter of 45 mm. at the expanded portion. The coraUites are subcylindrical and range from to 2 mm. in diameter. They are not in con- junction with one another but are separated by dissepimental tissue (pi. XIII, figs. 2-4). The corallite wall is rather thick and is probably somewhat porous. Each corallite bears 12 septa in the form of rows of spines (pi. XIII, fig. 2). The coral- lites are crossed by somewhat irregular and very thin tabulae which are unevenly spaced (pi. XIII, fig. 2). The space between these corallites is filled with dis- sepimental tissue, the dissepiments being irregularly arranged and convex up- wards. Many of these dissepiments have vertical plates on their upper surface but these do not extend upward to the next highest dissepiment. Discussion. This species was based upon specimens whi
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