On the Monticiiliporoids of the Cincinnati Gtotip. 1 39 



pying the angles of the cells. '-■■ For lack of sufficient characters 

 it will be reduced by us to a synonym. 



Atactoponlla, Ul., again, was formed for certain parasitic 

 forms, previously referred to Atactopora. The grounds for this 

 new genus are even more slight than those upon which the other 

 had been founded. The differences between the old and the new 

 genus are thus referred to: "The new genus differs from Atacto- 

 pora, as before restricted, in having numerous closely tabulated 

 interstitial cells, cystoid diaphragms in the proper zooecia [tubes], 

 and thin, instead of thick walls. These are all good generic char- 

 acters," etc. If these constitute good generic characters, then it is 

 time to raise every species to the rank of a genus, and give to each 

 individual a specific name ! 



Mr. Ulrich has by no means yet lost his ardor for making 

 new genera and species, and he continues the work in the 14th 

 Annual Report of the Geological and Natural History Survey, of 

 Minnesota (1885). In this volumef he defines as a new genus 

 Homotrvpella, UL, basing it upon a ramose corallum, with small, 

 thickened cells, cystoid diaphragms, numerous interstitial cells, 

 numerous spiniform corallites, and other minor characters. All of 

 these are uncertain and inconstant, and can not be considered by 

 us as worthy of generic rank. 



In the following table we have placed the sub-genera and their 

 synonyms under the two genera which form the family. 



Family. MONTICULIPORID^, Nich., 1879. 



I — Genus. Monticulipora, D'Orb, 1850. 



Nebidipora, McCoy, 1850. , . 



Hetcrotrypa, Nich., 1879. • .' . 



Diplotrypa, Nich., 1879. •-.' ' 



Monotrypa, Nich., 1879. 



Frasopora, Nich., 1877. 



Peronopora, Nich., 1881. 



Atactopora, Ul., 1879. 



Atactoporella, Ul., 1883. 



Afnplexop07'a, Ul., 1882. 



Aspidopora, UL, 1882. 



Cheiloporella, UL, 1882. 



Spatiopora, UL, 1882. 



Homotrypa, Ul. . 1882. 



»J. S. N. H. vi., 158. 

 TPage S3. 



