G2 
anuulations except towards the final period of growth of the coralliim where 
they are confluent and continuous with one another, not separated hy 
marked imthickened segments, Imt forming a dense thickened peripheral 
layer along individual walls, presenting an ohconate figure in section, which 
is very characteristic of the species. Annulations have heen observed below 
this, and even one or two in the axial region, hut these occurrences are rare. 
Sometimes the first, or the two first, in ascending order in the peripheral 
area, are separate, and distinctly formed ; then succeeds the line of amalga- 
mated annulations nearly continuous with one another.^ The inorganic 
dejiosit, which forms such a prominent feature in S. crinita and S. ovata, is 
not developed to an extent in any way approaching that seen in those species, 
and at times is barely perceptible at all. In a Tasmanian specimen from One 
Tree Point it is entirely absent. 
The surface features of Stenopora tasnianiensis are very characteristic 
of it. In a recent Memoir, Prof. Nicholson and the IVriter pointed out that 
this species can he at once recognised amongst the other Australian forms hy 
its long oval calices arranged in obliquely longitudinal rows, resulting in a 
quincuncial disposition of the apertures. The thickening previously de- 
scribed at the final period of growth along the line of close-set annulations 
extends to the outer surface, the calices being separated from one another l^y 
crestiform interstitial surfaces. The vestibules^ of the calices are straight- 
walled or funnel-shaped, according to the development of the diaphragms 
Avhich appear to close those of S. tasmemiensis at the final period of growth. 
This partial closing of the tube mouths at maturity has been well 
described and figured by Lonsdale.^ lie says, “ Where the mouth becomes 
free and oval, the walls are thin and sharp, and perpendicular within the tube. 
In some cases they are in contact ; but in others tliey are separated by grooves 
of variable dimensions, in which very minute foramina or pores may be 
detected. As the mouth approaches towards maturity, the grooves are more 
or loss filled up, and the walls thicken, a row of very minute tubercles being 
discoverable along the crest. At this stage the inner side of the tube ceases 
to be vertical, being lined by a very narrow inclined band. The mature 
mouths are separated by a bold ridge, generally simple, but not infrequently 
' Well shown in a figure by I’rof. H. A. Nicholson and the Writer, Ann. Mag. Nat. Hist., 1886, XVII, 
t. 3, t. 10. 
^ This term is employed to denote that part of the calice cut off by the diaphragm, or, as it was termed by 
Lonsdale, the “ band.” 
^ Strzelecki’s Fhys. Descrip. N. S. Wales, &c., 1845, t. 8, f. '2a-2d. See also Nicholson & Etheridge, 
Junr. , Ann. Mag. Nat. Hist., 1886, XVII, t. 3, f. 11 & 12 
