from the South Australian Tertiarics. 185 



which appears to be formed by one twisted process. The septa 

 arise between the costse. The caUce is more or less elhptical. 



Height -pV inch, greatest breadth -fV inch. 



Geelong, Victoria, South Australia. Coll. Geol. Soc. 



6. AntiUia lens, n. sp. PI. VIII. fig. 6 a-e. 



Coral in the shape of a cyclolite Fungia. The base is circular 

 in outline, nearly fiat, the concavity being very slight. The 

 epitheca is pellicular and faint. The costs; are seen as radiating 

 flat elevations, those corresponding with the smallest septa 

 being the smallest. The margin of the base presents slightly 

 exsert, equal processes, which are the septa. The upper surface 

 of the coral is convex and nearly hemispherical, the depression 

 for a small essential columella, formed by processes from the 

 base and septal ends, being slight. The septa are in six systems 

 of four cycles ; the primary and secondary septa are equal, 

 and the tertiary are nearly as large ; those of the fourth and 

 fifth orders are somewhat less : all are very convex superiorly, 

 and less so and nearly straight externally. The laminse are 

 thin, and are very strongly marked by sharp ridges, which, 

 radiating from the basal part of each septum, are more or less 

 parallel, and give at the free margin a laterally dentate appear- 

 ance. The appearance is less in the smaller septa. There is 

 often a paliform process on the larger septa near the columella ; 

 and the terminations of the ridges give the dentate character to 

 the free margin of the septa. The endotheca is scanty, stout, 

 and inclined. 



Kreadth -yV inch, height -p\ inch. 



Hamilton, Victoria, South Australia. Coll. Geol. Soc. 



Remarks on the new Genu^ and Species. 



There is much that is very interesting in these Australian 

 forms ; they are so novel to those who are acquainted with the 

 coral-fauna of the past in Europe and America, and moreover 

 they present structural peculiarities which remove some broad 

 lines of demarcation between some of the principal families in 

 our classification. 



The new genus Conosmilia possesses the twisted riband-shaped 

 columella of the subfamily Caryophyllaccse, the endotheca and 

 septal margin of the Trochosmiliacca;, and the irregular septal 

 arrangement which was so common in the corals of the Oolitic 

 age, and which, from its octomeral type, reflected the rugosa of 

 palaeozoic times. 



A simple conical coral with a twisted " serialaire " columella, 

 an endotheca, and an octomeral arrangement of its septal sys- 



