PLATE IX. 



Stromatopoea EXP ansa H. (£• W. 

 Page 226. 



Fig. 1. The surface of a specimen as it appears when split horizontallj, breaking 

 through several of the laminse. The black dots mark the vertical fila- 

 ments, but those forming the slight elevations are represented too 

 strongly in the lithograph, there being only from four to seven of the 

 stronger ones near the center of the elevation, while the others are small 

 and evenly arranged over the surface. (Natural size.) 



Cavnopora PLANULATA H. i& W. 

 Page 228. 

 Fig. 2. The natural surface of a specimen that has been weathered clean but 

 uninjured, showing the scarcely elevated centers with the tubuli ramify- 

 ing from them over the surface, while those below have their opening in 

 the center of the elevation. (Natural size.) 



Strojiatopora {C^nostroma) ixcrvstans H. & W. 



Page 227. 

 Fig. 3. The natural surface showing the strongly and abruptly elevated centers, 

 with their ramifying tubuli. (Natural size.) 



Stroma TOP OR A {Cusxo stroma) solidula H. & W. 



Page 227. 

 Fig. 4. The natural surface of a fragment from the margin of a specimen, with the 

 irregular elevations and ramifying tubuli. (Natnral size.) 



Zaphrentis so lid a H. £ W. 



Page 231. 

 Fig. 5. This is the largest individual seen of this species, and shows the general 

 form of the cup, and the strong lamellae. 



PaCHYPHYLLUM SOLITARIVM H. £ W. 

 Page 232. 

 Fig. 6. An individual showing the usual form of the cup, with the lamellas extend- 

 ing down the exterior surface. 

 ' 7. A transverse section of another specimen, showing the arrangement of the 

 rays in the interior. The solid external rim corresponds with the elevated 

 portion of fig. 6, and also with the same part of each calyx in P. Woodmani, 

 fig. 9. 

 " 8. A longitudinal section of an individual larger than fig. 6. At the base on 

 tlie left side there is an accumwlati(m of c<'llulose material, developed 

 apparently for the purpose of support and to give surface for attachment 

 to some foreign substance. The vertical lines at a represent the junction 

 of the vertical lamellae near the center, forming a very slight elevation in 

 the bottom of the calyx, or a kind of loose columella. 



PACIIYVIIYLLrM WOODMAXI White, sp. 

 Page 231. 

 Fig. 9. Surface view f»f a small specimen, having the calyces of medium size. Pre- 

 sented by H. T. Woodman, E.-<q., of Dubuque, Iowa. 



