PLATE XLV11. 



PAGE. 



Fig 1. FISTULIPOBA COMMU MS Ulr. (See also PI. XL VIII) 476 



1. Portion of spec.imeii showing its natural size and the direction of its 



monticules. Many specimens are without these elevations. 



1 n. Surface of same, x!2, showing slightly abraded condition. 



Hamilton group, Buffalo, Iowa. 

 Prof. A. H. Worthen's collection. 



Fig. -. FISTULIPOKA STELLIFEBA Rominger 481 



2. An example natural size, showing distribution. of stellate maculae. 



2 n. Surface of same, x!2. showing arrangement of zooe.'ia around the 



macula-. 



Hamilton group. Thunder Bay. Mich. 



Prof. A. H. Worthen'p collection. 



Fig. :f. FISTULIPOBA MONTICULATA Ulr. (See also PI. XLVIII) 177 



3. A tuberculated example showing mode of growth. Na' ural size. 



Prof. A. H. Worthen's collection, 

 (i. Smaller fragment without monticules. Natural size. 



E. (). Ulrich's collection. 

 'i. Surface of fig. S, x!2, showing usual characters. 



Hamilton group. Buffalo. Iowa. 



Fig. 4. STBOTOPOBA PEBMINUTA Ulr 187 



4 and 4 n. Two examples, one of them slightly tuberculated. Natural size. 

 I h. Surface of llg. 4, x!2, showing arrangement of zoceeia and onecia. 

 Up. Helderberg. Ohio Falls. 

 E. O. Ulrich's collection. 



Fig. 5. FISTULIPOBA ASTEICA Ulr. (See also PI. XLVill) 477 



5. Fragment of this species; natural size. 

 ."i li. Surface of same, x!2. 



Hamilton group, Buffalo, Iowa. 

 E. O. Ulrieh's collection. 



Fig. ti. FISTULIPOBA COLLINA Ulr. (See also PI. XLVIII) 478 



6. About hah" of a subeircular expansion; natural size. 



a. Surface of same, x!2, showing the thin interspaces and faintly elevated 

 lunarium. 



Hamilton group, Buffalo, Iowa. 

 E. O. Ulrich's collection. 



