Si- 
Specimens fractured longitudinally usually cxliibit the corallum sub- 
divided in a similar direction into a number of superimposed strata of greater 
or less tbickness. No better example of tliis can be adduced tliaii in Lons- 
dale’s old figure of Sleuopora ovata, and it is equally well shown in our 
PL II, Pigs. 1 and 2, PL III, Pigs. 2 and 3, and PL IV, Pig. 2. These 
strata, or corallitc internodes, it is believed, indicate periods of growth, a 
cessation of active increase taking place at the upper line of each stratum, 
and not merely lines of high tabular development, as in some corals. They 
arc usually well marked in most of the species, but probably more apparent 
in S. crlnita (PL II, Pigs. 1 and 2), and ovata ; and least so in tas- 
mcmiensis, 
Practured surfaces of S. Leichliardti present even a plumose appear- 
ance, arising from a slight tendency of the lirancbcs to expand at their apices. 
The same feature is to some extent noticeable in another species from the 
cbloritic rock of tbe Gyinjiie Gold-field. 
Tlie general features of the surface in the Australian Stenoporcc are 
moderately uniform, l3ut in S. crinita, as will be explained later, monticules 
have been noticed (PL V, Pig. 1). At the same time, other important modifi- 
cations may become apparent when we become better acquainted with the 
exterior of tbe corallums of some of tbe other species. 
"We know equally little regarding the method of attachment of tlic 
corallum in Stenopora. In our earlier description of tbe genus. Prof. 
Nicholson and the Writer used the term “ rooted below,” and although it is 
still quite possible that some of tbe species may have been so fixed to sub- 
marine bodies, we now have definite evidence that at least one species, 
crinita, was firmly attached (PL III, Pigs. 1 and 2) by its general base to 
other objects, and in fact enveloped them. Tbe undescribed Tasmanian 
.species cannot lie said to be encrusting, as tbe foliations are bilaminar, and it 
is therefore within tbe range of possibility that this may have been a rooted 
form. Taking a typical Stenopora, thin sections of tbe corallum sIioav 
different aj)j)earances in different portions. Thus, in a transverse section across 
a branch, the axial corallitcs are seen to differ in no essential features of their 
structure from those of Monticulipora or Favosites, except, of course, that 
there is no trace of tbe septal spines of tbe latter. Eacli possesses its oaaui 
wall, wliicli is not abnormally thickened, tbe boundary between contiguous 
tubes being clearly indicated, generally by a distinct dark line. Tbe tubes in 
