TERTIARY CORALS. Al 
ofiron. Many have been rolled ; and in all the original carbonate of lime of the sclerenchyma 
has been but slightly altered. 
Famity—AS7TR ALD. 
Sus-raminy—ASTRAIN A. 
Tribe—ASTRAACEA. 
Genus—SoLENASTRAA.! 
The generic characters of the Solenastre@ are as follows :? 
The corallum is usually massive, convex, cellular, and light: the corallites are long, 
and are united by a well-developed exotheca, and not by the coste, which are never large 
enough to come in contact with those of neighbouring corallites. The costa are always 
more or less rudimentary. The calicular margins are free and circular: the columella is 
spongy, and usually but feebly developed. The septa are very thin, and are formed by 
well-developed lamin : their margin is dentate, and the lowest teeth are the largest. 
The endothecal dissepiments are simple, numerous, and close. ‘The gemmation is extra- 
calicinal. 
The species already recorded have been separated into those with rudimentary and 
those with distinct columelle,*® but they are all well and easily distinguished from the six 
forms about to be described. 
1. SoLENASTR#A CELLULOSA, Duncan. PI. V, figs. 1—7. 
The corallum is rather short, and appears to increase in breadth: its upper surface 
is irregular, and covers more space than the lower. 
The corallites are inclined, distant, parallel, and are connected by a cellular exotheca 
which here and there forms a denser connecting tissue. 
The calices are unequal in size and irregular in outline ;* they project considerably above 
' “Compt. Rend. de l’Acad. des Sc.,’ vol. xxvii, p. 494, 1848. Milne-Edwards and J. Haime. 
2 «Hist. Nat. des Corall.,’ vol. ii, p. 495, Milne-Edwards et J. Haime. 
3 Edwards and Haime, op. cit., page 497. 4 Plate V, fig. 7. 
