PAB. I. 
CORALS FROM THE CRAG. 
SPHENOTROCHUS INTERMEDIUS (p. 2). 
Fig. 1. An adult specimen ; natural size. 
la. An adult specimen ; variety having a dilated basis ; natural size. 
14. A magnified view of the specimen represented at fig. 1. 
lc. A vertical section of the same, corresponding to the short diameter of the 
calice ; magnified. 
1d. Calice of the same; magnified. 
le. A very young individual, magnified; the natural size is indicated by the 
length of the line placed near this figure. 
lf, 1g, 14, 17. A series of young individuals, at different periods of their growth ; 
magnified. 
Fuasettum Woopit (p. 6). 
Fig. 2. A side view of the corallum ; natural size. 
2a. A specimen magnified, and showing the mode of arrangement of the septa; 
one half of the calice has been cut away down to the bottom of the fossula. 
26. Calice entire; natural size. 
BALANOPHYLLIA CALYCULUS (p. 9). 
Fig. 8. Two individuals cemented together by their basis ; natural size. 
3a. A variety with a narrow basis; natural size. 
36. An individual remarkably tall, with its calicular extremity worn away ; natural 
size, ; 
3c. Horizontal section of the same, near the calice, magnified so as to show the 
mode of arrangement of the septa. 
3d, A fragment of the wall deprived of its epitheca, and much magnified. 
Cryptaneta Woopii (p. 7). 
Fig. 4. A small aggregation of corallites imbedded in a mass of Cellepora; natural 
size. 
4a. One of these corallites extracted from the mass of Cellepora, and showing its 
epitheca ; natural size. 
4. One of the same separated from the extraneous mass, and having its epitheca 
dimpled by pressure of the surrounding Cellepora. 
4c. Calice, magnified, 
4d. One of the same corallites magnified, and having part of its calice cut away 
so as to show the denticulate edge of the septa; the dimples of the epitheca 
are accidental and produced by the investing Cellepora. 
