44, BRITISH FOSSIL CORALS. 
4, SoLENASTRHA GEMMANS, Duncan. Plate VI, figs. 1—7. 
The corallum is tall, its base is small, and the calicular surface is very irregular. 
The corallites are very unequal, they are sometimes crowded and for the most part are 
separated by ccenenchyma; they are not very exsert, as a rule, but many pass up above 
the level of the common ccenenchyma and exhibit their wall marked with small 
costz. 
The exotheca is dense, and resembles layers of membranous epitheca more than a cellular 
exotheca. It is found here and there only, so that much of the wall of many corallites is 
free. The exotheca spreads across from corallite to corallite in wavy horizontal layers, and 
the costz are hidden by it. But where the exotheca is wanting the coste vary greatly 
in their size and development.’ 
The calices are irregular in shape, size, and distance ; the fossa is shallow, and the 
columella is rudimentary. The calicular margin is rather blunt. The septa are long, 
delicate, very ragged on their sides, from their connection with the endotheca, and but 
slightly granular. There are four cycles and six systems ; the primary and secondary septa 
extend well inwards, and their ends, which are occasionally enlarged, are connected by 
ragged and irregular processes ; the tertiary are smaller; and the septa of the fourth and 
fifth orders are almost rudimentary. Sections of corallites show the wall to be mode- 
rately thick. 
The costze are unequal, and are either plain, short and rounded, short and monili- 
form, short and bluntly dentate, or even almost vesicular. They are rudimentary when 
covered by the exotheca. 
The endotheca is very abundant and highly inclined.* The gemmation is peculiar, and 
causes the species to resemble in its growth some of the Cladacoracee: the bud separates 
widely from the parent, and then passes upwards and soon gives forth a bud which takes 
the same course. 
Height of corallum several inches. Diameter of corallites 2th inch. 
Locality.—Brockenhurst. In the collection of Frederick Edwards, Esq., F.G.S. 
5. SoLENASTR#A Bryricut, Duncan. Plate VI, figs. 8—13. 
The corallum is massive, short, and has a very irregular calicular surface. The 
corallites are short, and widen out rapidly from a comparatively small base. 
The calices are large, very irregular in shape, generally close, and they are separated 
by the ccenenchymal exotheca ; the fossa is shallow, the columella is rudimentary, the wall 
at the margin is stout, and the septa are thin, often wavy, and rugged laterally. 
* Plate VI, figs. 2, 3, 4. 2 Plate VI, fig. 7. 3 Plate VI, fig. 7. 
