170 PROF. W. N. BENSON AND DR. S. SMITH ON [vol. lxxix, 



Fig. 3. Amygdalophyllum etheridgei. Transverse section, natural size. In. 

 this specimen, the septa to the right of the figure have been crushed 

 and broken against the columella. Similarly, in fig. 2, the tabellse on 

 the right of the columella are in a crushed condition. These injuries 

 have undoubtedly been effected after the corals had been incorpo- 

 rated in the rock. (See p. 162.) 



4. Cionodendron columen, gen. et sp. hov.. Slaughterhouse Creek, near 



Gravesend (N.S.W.). Transverse section, natural size. (Seep. 165.) 



5. The same. Transverse section, X 3. a — neanic stage, earliest 



observed ; b = neanic stage, later ; c = neanic stage, still later ; 



d — ephebic stage. Reference to the lettered corallites will be found 



on p. 166. The structure of the columella is well shown in corallite d. 



[The longitudinal section of Cionodendron columen is shown in the next 



plate (fig. 7). All the sections of this coral were cut from the holotype.] 



Plate IX. 



PaLJEOSHILIA, A3irGDALOPHYLLUM, LlTIIOSTXOTIOX, AND 

 ClOXOVEXDll OX. 



Fig. 1. Cyathophyllum (PalseosmiliaJ murchisoni Edwards & Haime. Visean 

 (South- West of England) ; a specimen in the British Museum 

 (R 17225). Transverse section, X 1"3. This figure is included for 

 the purposes of comparison with Amygdalophyllum (fig. 2). In the 

 number and length of septa, and in the wide development of dissepi- 

 mental tissue, the two genera are similar. (See p. 163.) 



2. Amygdalophyllum etheridgei Dun & Benson. Burindi Series, Babbin- 



boon (N.S.W.). Transverse section, Xl'3. F in figs. 1 & 2 indicates 

 the position of the cardinal fossula. (See p. 163.) 



3. Lithostrotion stanvellense Etheridge fil. Burindi Series, neighbourhood 



of Bingara (N.S.W.). Transverse section, X 2. Note the large 

 columella, particularly in corallite a, and also the wide zone of 

 dissepiments unintersected by septa in corallite b recalling the 

 extrathecal region of Lonsdaleia. (See p. 168.) 



4. Cionodendron columen, gen. et sp. nov. Burindi Series, Slaughter- 



house Creek, near Gravesend (N.S.W.). Transverse section, X 3. 

 A few corallites from the same section as PI. VIII, fig. 5 : here in- 

 cluded for purposes of comparison and contrast with Lithostrotion. 

 (See p. 166.) 



"5. Lithostrotion martini Edwards & Haime. Visean, Settle (Yorkshire). 

 Longitudinal section, X 2. (See p. 167.) 



^6. Lithostrotion stanvellense Etheridge fil. Lower Carboniferous, Lion 

 Creek, Stanwell, near Rockhampton (Queensland). Longitudinal 

 section, X 2. (See pp. 167, 168.) 

 7. Cionodendron columen, gen. et sp. nov. Burindi Series, Slaughter- 

 house Creek, near Gravesend (N.S.W.). Longitudinal section, X 3. 

 Figs. 5, 6, & 7 are arranged so as to show the differences between 

 the typical British and typical Australian forms of Lithostrotion and 

 between these and Cionodendron. L. martini has a slender colu- 

 mella and well-formed tabula? ; L. stanvellense has a stout columella, 

 sharply bent tabula?, and small arched tabellse ; and Cionodendron 

 has a very stout columella, and concave but very sharply bent 

 tabula?. (See p. 167.) 



[The sections reproduced as figs. 1 & 2 in PL VIII were irreparably broken 

 in transit through the post. The other sections are in the custody of the 

 institutions to which belongs the original material whence they were 

 prepared.] 



