PROCEEDINGS OF SECTION C. 



431 



In fig. 4 (drawn from a section through specimen 46, Sellick's 

 Hill) the method of a sexual reproduction by budding is well shown. 

 The loculi exhibit a feature common to many individuals of rugse 

 projecting inwards, both from the inner and outer walls, reminding 

 one of an internally-cogged gear wheel.- In some cases these are con- 

 tiguous with the rhizoid lamellse on the outer side of the outer wall, 

 and one has a curious inversion of the perforate coral structure, the 

 ridges (rugae) being inside and the lamellae outside the thecal wall. 



We may now leave the turbinate or conical type of Archaeocyathinge, 

 and refer very briefly to the bell-shaped calice having an expanded 

 rim. In Plate II., fig. 1, careful etching has resulted in revealing a calice 

 of this type resembling in shape a convolvulus flower. A reference 

 to the sketch (B in fig. 5) will make this clear. In the photograph the 

 external wall (Plate II). has been preserved over the central portion of 



Fig. 5. 



Sketch of three types of Body Form of Archceocyathinoids . — A, the Conical or 

 Turbinate ; B, the Bell or Convolvitliis Shape ; and C, the Flabellate or Expanded 

 Form. The absence of any well-defined Central Cavity is to be noticed in C. 



the calice. The inner wall shows in the lower portion, while the delicate 

 vertical septa stand out admirably on the dark matrix. The expanded 

 rim (in section) appears at the top right hand, and this portion is 

 sketched separately in figure 6. 



1 noteworthy, feature is the union of the outer and inner walls 

 at the periphery (L), which tend to show, as stated elsewhere, that the 

 outer and inner walls, and not the open ends of the loculi at the rim, 

 were the scene of the " living zones " of the organism. 



The last type to be considered in this preUminary paper is that 

 roughly indicated in fig. 5, at C — the flabellate irregular expansion — 

 which possesses nothing in the shape of a calice, and is anchored by 

 bundles of rhizoid lamellae proceeding from the lower (or proximal) 

 surface. In Plate II., fig. 2, appears a photograph of a specimen of this 

 type from, Ajax Mine (10 miles north of Beltana), while fig. 7 (text) is a 



