M-.IM 



c!'J / 



PLATE LXVII. 



PAGE 

 Fig. 1. TZNIODICTYA BAMULOSA Ulr ......................................... 52g 



1. Specimen split through center. showing natural size and mode of branch- 



ing. 



Keokuk group, Warsaw, 111. 



Illinois State Museum. 



1 a and 1 /. Two specimens, natural size, showing the spreading base. 

 1 b. Central portion of surface of 1 a, x!8. 

 1 c and 1 d. Fragment of the natural size, and a portion x9. 

 1 e. Marginal portion of 1 , x!8. 

 1 g. Fragment, natural size. 

 1 i. Tangential section, x25, showing characters of frond just beneath the 



surface, 



1 j. Portion of 1 i, x50. 

 1 k. Deep tangential section, x25, showing thin hemisepta crossing the 



zooecia. A section since prepared shows that the minutely dotted struc- 



ture shown in the walls also pertains to the median laminiB. 



1 (. Vertical section, x25, showing form of zooecia. In a better section, 



lately prepared, the inferior hemisoptum is well developed. 

 Keokuk group, Nauvoo, 111. 

 E. 0. Ulrich's collection. 



Fig. 2. T.BNIODICTYA BAMULOSA V3T. BURLINOTONENSIS Ulr ............................. 529 



2. Specimen of the natural size. At the lower end the zoarium is twisted 



so that it appears to taper. 



2 a. Surface of same, xlS. 



2 6. A reticulated example, referred with doubt to this variety. Natural 

 size. 



Burlington limestone, Burlington, Iowa. 

 Illinois State Museum. 



Fig. 3. TJENIODICTYA CINOULATA Ulr ....................................................... 530 



3. Specimen split through the center, showing natural size and mode of 



growth. 



Keokuk limestone, Warsaw, 111. 



Illinois State Museum. 



3 re. Tangential section x'25, showing structure of frond just below the sur- 



face. The transversely lined region extends all around the zooecia, 

 differing in that respect from T. ramulosa, (see flg. 1 i.) 

 3 6. Portion of same section, x50, showing different form of zocecia. 



