8 INVERTEBRATE ANIMALS. 



fossil, 14 ; Palseozoic. These genera are of uncertain 

 position. 



II Corals from the Pacific and Indian Oceans, in- 

 cluding a very beautiful Seriatopora, possibly 

 undescribed : other examples from the Red 

 Sea, &c. 

 Division TABULATA. Corallite divided by horizontal 

 plates : rays not developed. 

 Group 20.— Family FAVOSITID^. Favus, a honeycomb. 

 Estimated number of species, 102 ; all Palaeozoic fossils. 

 ^ The Chained-Coral and other species from the 

 Wenlock Limestone, &c. 

 Division PERFORATA. Rays Ivell developed: coral 

 porous. 

 Group 21.— Family PORITID^E. Reef-building corals, 

 usually massive. Estimated number of species : recent, 

 83 ; British, ; fossil, 36. 



U Examples of Psammocora, Montipora, Alveopora, 

 and other genera. 

 Group 22.— Sub-Family TURBINARIN^ (Milne Edwards). 

 Turbo, a top. 



Genus TURBINARIA (Oken) = GEMMIPORA 

 (Blainville). Estimated number of species : recent, 

 11 ; British, ; fossil, 7. 



II Large foliaceous and cup-shaped Corals from the 

 East Indies and the Fiji Islands. Dome- 

 shaped specimen oi Astraopora, remarkable for 

 its highly finished calices. 

 Group 23. -Genus MADREPORA (Linnaeus). Part I. 

 The name is from the Italian, signifying Mother-pore, 

 the apical polype being the parent of the rest on the 

 same branchlet. Natives of tropical seas : one species 

 is known from the White Sea. 



