360 THE MONTICULIPOROIDS. 



The species of Callopora appear to be confined to the Ordovician and 

 Silurian rocks. 



Lastly, the Ordovician genus Prasopora differs from Callopora mainly 

 in the fact that the autopores are furnished marginally with a series of 

 vesicular or " cystoid " tabulae, which enclose a central area traversed by 

 straight tabulae. 



LITERATURE OF MONTICULIPOROIDS. 



1. " Polypiers Fossiles des Terrains Paleozoiques." Milne-Edwards and 



Haime. 185 1. 



2. " Die Chsetetiden der ostbaltischen Silurformation." Dybowski. 



1877. 



3. " On the Structure and Affinities of the Genus Monticulipora and 



its Subgenera." Nicholson. 188 1. 



4. "American Palaeozoic Bryozoa." Ulrich, (A series of papers in 



the ' Journal of the Cincinnati Society of Natural History, 5 1879- 

 1884). 



5. " Contributions to the Micro-Palaeontology of the Cambro-Silurian 



Rocks of Canada." Foord. 1883. 



6. " On the Genus Fistulipora, M'Coy, with Descriptions of several 



species." 'Annals and Magazine of Nat. Hist' 1885. Nichol- 

 son and Foord. 



7. " On the Tasmanian and Australian Species of the Genus Stenopora, 



Lonsdale." ' Annals and Magazine of Nat. Hist. 5 1886. Nichol- 

 son and Etheridge, jun. 



8. " The Salt-Range Fossils — Ccelenterata." ' Palaeontologia Indica. 



1886. Waagen and Wentzel. 



