Prof. P. Martin Duncan — A New Oolitic Coral. 341 



otherwise than a simple, tall individual, attached, like many simple 

 corals, to a foreign body. The epitheca is strong, and, as is usual in 

 the genus, is remarkably ringed with bourrelets d'accroissement, or 

 growth-rings, so that the surface is tumid and constricted consecu- 

 tively about thirteen times in the height of 37 mm. No abrasion of 

 the epitheca has occurred, and there are therefore no septa to be seen 

 on the flanks of the coral from wearing in. The inside of the coral 

 is filled with a brown homogeneous calcite, and the septa and 

 columella are white in colour. The condition of preservation is 

 very fair, but it appears that some destructive action proceeded, 

 for a septum of the fourth order is missing here and there, a fifth 

 being present. 



Axosmilia elongata, sp. nov., Pea Grit, "West of England. 1. Transverse section 

 (enlarged five times). 2. Interior (natural size). 



Axosmilia elongata, sp. nov. — Corallum simple, tall, straight, 

 cylindrical, with a small peduncular attachment which leads upwards 

 to a conico-cylindrical stem, terminating in a cylindrical top ; diameter 

 one-fifth of the height. 



Epitheca strong, marked with narrow rings and alternate swellings 

 and constrictions. Wall merging into the epitheca, epithecate wall 

 thin. Calicular section nearly circular in outline. 



Septa well developed, eight long and stout reaching the small, 

 essential, styloid, slightly compressed columella. Six of these are 

 primaries and two are secondaries, the other secondaries being 

 smaller. Tertiary septa long, slender, and often having a paliform 

 knob at the inner end, not always straight. The higher orders are 

 small and somewhat irregularly developed (unless absorption of some 

 others has taken place). The bases of the septa at the thin wall are 

 large, and the laminae become slender towards the columella. Pro- 

 bably the correct cyclical arrangement is four systems with four 

 cycles, and two systems with three cycles and part of a fourth, but 

 the following can be seen. 



Two systems with three cycles of septa and one septum of the 

 fourth order in each. Two systems with four cycles complete, the 

 fourth and fifth orders of the fourth cycle being placed as is usual in 

 other Madreporaria. A system with three cycles and two members 

 of a fourth cycle, but in one half-system there is a septum of the 

 fourth order, and in the other half-system there is no septum of the 



