THE JOURNAL 



OF THE 



mi nn 



f Of wmi Hism. 



VOL. II. CINCINNATI, OCTOBER, 1879. 



No. 3. 



DESCRIPTION OF A jSTEW GENUS AND S03IE NEW 

 SPECIES OF BRTOZOANS FRO 31 THE 

 CINCINNATI GROUP. 

 By E. O. Ulrich. 



The following generic name is proposed for the reception of a 

 number of species, that at first were considered to be aberrant forms 

 % of Chcetetes or 3Ionticulipora. A more thorough examination, how- 

 ever, showing the constant occurrence of certain characteristics, has 

 led me to the conclusion that the characters developed in the species 

 are of sufficient importance to sanction their separation from those 

 genera under a distinct generic title. The genus may be characterized 

 as follows : 



Ataotopora, nov. gen. 



\^ty.—Atactos, witliout regularity.] 



Br^ozoarj' variable in shape, incrusting, sub-ramose or truly ramose, 

 composed of numerous closely approximated tubes, the walls of which 

 are imperforate. Tubes supplied with pseudo-septa, which in some 

 species are visible at the surface, and in others not. Pseudo-septa 

 verj' irregular in size, number, and arrangement, probably numbering 

 never more that five or six in a single tube. Diaphragms, when present, 

 complete. Interstitial tubuli rather sparingly developed. Surface 



