igo Citiciiiiiati Society of Natural History. 



tubes; interstitial cells numerous, having many closely set, 

 horizontal tabuke ; a few si)iniform corallites may be observed 

 in tangential sections. 



Group III. Dendroid or Ramose ; Branching more or less ; 

 stems cylindrical or sub-cylindrical; base free or attached; 

 calices covering the branches, varying in form ; monticules 

 present or absent. 



I. Surface smooth. 



a. calices oval or circular; all similar. 



'•■■ apertures of calices thick 17 



* apertures oblique ; lips thin 18 



b. calices oval or circular; interstitial cells present. 



•■ apertures oblique ; lips thick 19 



•■ maculae present, with larger cells than average, 20 . 

 •• larger cells separated by number of small ones, 21 

 ■ macuku present ; made of larger cells, and oc- 

 cupied also by minute cells 22, 23, 24 



* calices surrounded by ring-like wall 25 



c. calices rhomboidal ; arranged in lines 26 



d. calices irregular in form 27, 28 



II. Surface with macuke or low monticules. 



a. calices polygonal or sub-polygonal. 



® clusters of cells larger than average; intersti- 

 tial cells few 29 



* cluster of cells smaller than average ; intersti- 



tial cells numerous 30 



* low monticules present; interstitial cells pres- 



ent 31 



t no interstitial cells 32, 33 



/). calices oval or circular. 



^ niacuhu or monticules formed of smaller cells. 34 



III. Surface with conspicuous monticules. 



a. calices of two kinds; monticules elongated or conical. 



* calices large, sub-polygonal 35 



* calices large, oval 36 



* calices ovate or sub-circular 37 



b. calices of two kinds; monticules conspicuous, ar- 



ranged in alternate manner 38 



c. calices sub-equal; monticules small, arrangi.il in 



alternate manner 39. 40 



