686 PALEONTOLOGY OF ILLINOIS. 



and the five genera Cyclopora, Cycloporella, Proutella, Streblo- 

 trypa and Worthenopora, which, with us constitute that divi- 

 sion, are removed to this family, a proceeding for which there 

 is even less reason than in the preceding case. In fact the 

 STREBLOTRYPID.E is one of the best marked families of Palaeozoic 

 Bryozoa, resembling the PTILODICTYONIDJE much less than do 

 the STICTOPORID.E and some of his FENESTELLID.E. A union with 

 the RHABDOMESONTID.E might have been comprehended and per- 

 haps excused by us, since that family embraces some of its 

 nearest relatives. Coscinella, we believe, is properly placed in 

 the family, but he has also put the genus with the FENESTELLID.E, 

 while Intrapora, to which Coscinella is very nearly related, is 

 found among the STICTOPORID^E. 



The RHABDOMESONTHLE is constituted as in this volume, only 

 Anisotrypa belongs with the BATOSTOMELLHLE, where he has 

 also placed it. 



The RHINOPORID.E and SPHRAGIOPORID.E embrace as in this 

 work only the typical genera. 



STICTOPORID^:. In this family he places, besides the genera that 

 we refer there, also Acrogenia, Cystodictya, 'Dichotrypa, Phrac- 

 topora, Prismopora, Scalaripora and T&niopora which with us 

 form the bulk of our CYSTODICTYONID^} ; also Arthropora, Intra- 

 pora, Stictoporella and Tseniodictya, which we refer to the 

 PTILODICTYONID^E on zooecial characters mainly; and Heliotrypa 

 which, a little higher on the page, he makes the type and only 

 genus of the HELIOTRYPIDJS. 



His family SUBRETIPORID^E is in every way equivalent to our 

 PHYLLOPORINID.E, he being of the opinion that Phylloporina Ulr., 

 is the same os Subretepora of d'Orbigny. 



This is a case very nearly like that between Mitoclema and 

 Enallopora, discussed above. D'Orbigny proposed Subretepora 

 for Hall's Intricaria reticulata, relying upon Hall's description 

 and figures (Pal. N. Y., Vol. I) for the characters of his genus, 

 which he defines as having a single row of large cells, occupy- 

 ing the entire width of the slender, irregularly anastomosing 

 branches, all of which agrees very well with the data upon 



