TERTIARY CORALS. 55 
2. 'TURBINOLIA EXARATA, Duncan. Plate IX, figs. 4, 5, 6, 7. 
The corallum is conical inferiorly and cylindrical superiorly, so as to be rather sub- 
turbiate. Its base is small and narrow, although the costa are very projecting there. 
The costa are greatly developed; they are subequal, very prominent, and thin; their 
free margin is rather sharp, and not much narrower than their base. 
The largest costae are very prominent inferiorly, and the tertiary arise at the distance 
of about one quarter of the whole height of the corallum from the base. 
The costs are very wide apart, and the base or bottom of the intercostal spaces is 
wide, very visible, and it is not marked by any dimpling. 
The sides of the costae are strongly marked with a rudimentary exotheca, which is 
attached to the wall close to the base of the coste (fig. 7). 
The wall is very thin. 
The calice is circular in outline, very deep, and its margin is rendered very distinct by 
the well-developed coste. 
The septa are slender, thin, and unequal ; they form three perfect cycles, and there are 
S1x systems. 
The septa and costz correspond. 
The columella is very small, cylindrical, pointed, and in the typical specimen there are 
two papillee on its free surface. 
Height ths inch. Diameter of the calice =ths inch. 
This very interesting species resembles the TZurbinolia Prestwichi, Edwards and 
Haime, in some points; but it has no vestige of a fourth cycle of coste ; moreover, the 
new species has not the truncated base of Zwrdinolia Prestwich, and its third cycle of 
coste arise high up. 
The width of the intercostal furrows and the absence of well-marked dimpling are 
very distinctive peculiarities of Zurbinolia exarata. 
Locality.—The species is found at Brook, Hampshire (New Forest). In the collection 
of Frederick Edwards, Esq., F.G.S. 
3. Tursrnouia Forsesi, Duncan. Plate IX, figs. 8, 9, 10, 11. 
The corallum is very small, conico-cylindrical, and has rather a sharp base. 
‘The costa are very stout, obtuse, and slightly prominent; the largest are often wavy 
in their upward course, and all are separated by wide intercostal furrows or spaces. There 
is a well-marked but very small costa situated high up in the corallum and in each 
intercostal space. 
There are large and distinct exothecal markings on the sides of the coste; but the 
existence of dimples on the wall at the bottom of the intercostal spaces is too doubtful to 
be safely asserted. 
