OCT 6 1902 



ADDITIONS TO THE MIDDLE DEVONIAN and CARBON- 

 IFEROUS CORALS IN THE AUSTRALIAN MUSEUM. 



By R. Etheridge, Junr., Curator. 



(Plates xxxvii. - xl.) 



1. MIDDLE DEVONIAN. 



Genus DiPHYPHYLLUM, Lonsdale, 1845. 

 (Murchison's Geol. Russia in Europe, 1845, i., p. 622.) 



DiPHYPHYLLUM GEMMIFORMIS,^ Sp. TVOV. 



(Plates xxxvii., fig. 1; xxxix., figs. 1 and 2; xl., fig. 1). 



Sp. Char. — Corallum composed of fasciculate to sub-compound 

 corallites, forming more or less large globose colonies. Corallites 

 radiating from a common centre, comparatively short, but the 

 heighth of the corallum increased by repeated gemmation; straight 

 or slightly flexuous, often laterally united into clusters by a 

 partial union of the walls, but without exothecal outgrowths, 

 circular when single, imperfectly polygonal when united, and with 

 an average diameter of eight millimetres ; walls thin ; calices 

 deep. Septal area as a very distinct peripheral ring, from a 

 quarter to one fifth the width of a corallite, forming a flat 

 border around each calice ; septa 30 - 40, all primary, proximally 

 straight, distally flexuous, delicate, and at times laterally denticu- 

 late, extending inwards for about one quarter the width of the 

 corallites. Interseptal loculi occupied either by complete trans- 

 verse dissepiments forming several cycles, particularly towards 

 the distal portions of the loculi, or incomplete, forming irregular 

 vesicles within the transverse dissepiments, peripheral portions of 

 the loculi sometimes quite devoid of dissepiments, leaving clear 

 spaces. Tabulate area comparatively large; tabulae very variable 

 both in their distance apart and in character ; they may be moder- 

 ately close, very close, or distant from one another, horizontal, 

 rather oblique, slightly concave, or inosculating, when vesicles are 

 formed, semilunate, lenticular, or even globular in form. Gemma- 

 tion parietal and frequent. 



1 Formed of buds. 

 A 



