194 FOSSIL ACTINOZOA. 



and open in the simple forms, confluent in the compound 

 forms, with complete imperforate septa, the edges of which 

 are dentate ; while the interseptal loculi are crossed by num- 

 erous trellis-like bars (" synapticulae "). The wall is generally 

 basal in the discoid forms always so and is generally 

 perforated by apertures. There are no dissepiments nor 

 tabulre. 



Fig. 81. Cyclolites elliptica, a simple type of the Fungida',, viewed from above, from below, 

 and from the side. Cretaceous. 



If we except the Silurian Palceocyclus (which appears to be 

 truly a Rugose Coral), the Fwngidce are not known to have 

 existed prior to the Jurassic, in which they are represented 

 by numerous forms (Comoseris, Protoseris, Anabacia, &c.) 

 Numerous forms are known in the Cretaceous, and there 

 is also a considerable number of Tertiary species. As an 

 example of the family we may take the genus Cyclolites (fig. 

 81), which ranges from the Cretaceous to the Miocene Ter- 

 tiary inclusive. In this genus the corallum is simple and 

 discoid, with a concentrically - striated basal epitheca and 

 numerous delicate septa. Micrabacia, of the Cretaceous, is 

 like Cyclolites, but has no epitheca, and has its basal wall 

 perforated ; while in the Jurassic Anabacia, also very similar 

 to the preceding, the basal wall is imperfect, so that the 

 under side of the disc is covered by the projecting septa. 



6. Pseudofungidce. This, the last family of the Aporosa, 

 merely requires mention, as affording a connecting link 

 between the Fungidoe and Astrceidce, the corallum agreeing 

 with the former in having a perforated basal plate, but 



