ANALYSIS AND DISTRIBUTION OF TYPES OF CALICLES. 287 
P. North Australia 5. Calicles large, deep and open, the septa as tiers of flakes. 
P. North Australia 8. Also with long, conspicuous, tongue-like septal flakes. 
P. Banda Sea 2. With the septal and wall flakes confused, large and ragged, 
obscuring the radial symmetry. 
P. China Sea 17 and 18. With septal and wall flakes distinct, but somewhat 
unsymmetrically arranged. 
P. Singapore 7. The septal flakes distinct, and rounded towards the fossa. 
These Tables conclude this attempt to describe the Indo-Pacific Porites. The student 
will find that Table IV. has brought new characters to light which are certainly the best— 
best where all are bad—for the purposes of any preliminary dividing of the forms into 
morphological groups. But the tables themselves at the same time make it perfectly clear 
that these groups cannot be regarded as genetic species. They are too large, too variable in 
themselves, and their distribution—which is seen at a glance in their designations—is too 
scattered. But in addition to these difficulties, we have once more to emphasise the fact that 
the characters relied upon have not the necessary stability to warrant any such supposition, 
What one would think should a priori be the most stable of all characters in the calicular 
skeleton—viz. the structure of the dividing wall—seems to depend not only upon the 
accidental forms assumed by the colonies, but even upon the positions of the calicles on 
these colonies. 
