30 MADREPORAEIA. 



of the ccenenchyma, which also affects the margins of the calicles. The smaller the cup, the 

 more pronounced is the stalk. But this, in later stages, is obliterated by the thickening of the 

 wall of the cup, till it appears to expand directly from the base. 



a. King's Sound, West Australia. Saville-Kent CoU. (Type.) 



h-g. King's Sound, West Australia. SavUlc-Kent Coll. 



h, i. Eocbuck Kay, West Australia. Saville-Kent Coll. 



There is another specimen, 95. 8. 29. 12, which I tliink should come under this head. It 

 is a single fan-shaped frond (11 cm. deep), somewhat crumpled, growing at the edge of a 

 decayed fragment which, on examination, proves to have been part of a large stock of the 

 same coral. The frond thus never started normally from a cup, but as a revival of a portion 

 of a large dying stock. The calicles agree in general characters with those of the preceding, 

 while the ccenenchyma has the same saw-like ridges with deep furrows, but much finer and 

 more delicately cut than in the type. This gives the specimen a peculiar appearance which 

 led me at first to consider it a new species. 



y. Eoebuck Bay, West Australia. SaviUe-Kent Coll. 



Species 6. Turbinaria plicata. (PI. IV. ; PI. XXXI. fig. 5.) 



Descriptio7i. — Corallum cup-shaped, stalk short and not very thick, cup shallow, with 

 walls sloping gradually outwards, but here and there bent sharply upwards and irregularly 

 crumpled up. This crumpled edge bends inwards towards the axis of the cup. The margin 

 of the cup, where it grows freely outwards, thins very rapidly (to 2 mm. and less) being 

 simply a row of young calicles flattened in the plane of growtL 



Calicles immersed, only near the edges do they show any signs of rising above the 

 ccenenchyma, fairly evenly distributed, from 3 to 5 mm. apart The neat elliptical aperture 

 averages 1*5 mm. in long diameter. The (ca.) 24 septa reach to about the half-radius 

 circle, bending round from the edge to descend perpendicularly round a conspicuous elliptical 

 fossa. The corallite seems to have no proper wall, as the interseptal loculi run in as irregular 

 gashes which can be followed far into the reticulum of the ccenenchyma. The septa are 

 direct continuations of the ridges of the ccenenchyma, and like them, are rough and granular. 

 Two ridges sometimes meet together in a septum. The oval columella is conspicuous, 

 protuberant, and has a thick, granular directive keel. 



The ccenenchyma is smoothly and finely engraved by a ridge-and-furrow system, twisting 

 irregularly about among the submerged calicles. The ridges have rows of irregular granules 

 along their edges. On the imder surface, the ridges and furrows run more evenly in the line 

 of growth, the former being more solid and stony, with, however, faint traces of the granules 

 along their uppermost edges. 



There is, unfortunately, only one specimen. It is the greater part of a cup 15 cm. in 

 diameter and 7 hiyh. One half has been broken away, but the larger half with the stalk 



