PLATE VIII. 



Fig. 1. — Beatricea nodulosa, Bill.; a fragment from the Cincinnati Group of 

 Marion County, Kentucky. Of the natural size. 



Fig. 2. — Transverse section of the same, enlarged twice. 



Fig. 3. — Vertical section of the same, enlarged twice. 



Fig. 4. — Part of a transverse section of another specimen of the same species, 

 enlarged 12 times. Hudson River Group, West-End Lighthouse, Anticosti. 

 [Collected by Mr. Richardson, Canad. Geol. Survey.] The section shows radial 

 pillars, similar to those of Labechia, traversing the vesicular tissue. 



Fig. 5. — Part of the preceding section, enlarged 24 times. In the interior of 

 the vesicles the granular calcareous matter is so disposed as to leave clear vertical 

 linear spaces. 



Fig. 6. — Part of the periphery of a very large specimen of the same, in trans- 

 verse section, enlarged 6 times, showing radial pillars and concentric laminae. In 

 parts of the section the ordinary lenticular vesicles characteristic of Beatricea are 

 preserved. Hudson River Group, West-End Lighthouse, Anticosti. [Collected 

 by Mr. Webster, Canad. Geol. Survey.] 



Fig 7. — Part of a tangential section of the preceding specimen, enlarged 6 times. 



Fig. 8. — Portion of the surface of the same specimen, enlarged 6 times, 

 showing different- sized apertures, the larger of which are disposed in indistinctly 

 spiral rows. 



Fig. 9. — Stachyodes verticillata, McCoy, sp. (= 8. ramosa, Barg.) ; a fragment, 

 the natural size. Devonian, Hebborn (Paffrath district). 



Fig. 10. — Longitudinal section of another specimen of the same, from the same 

 locality, enlarged twice, showing the axial tabulate tube, the growth of the 

 skeleton by successive convex layers, and the radiating zooidal tubes. [For the sake 

 of clearness, the zooidal tubes are placed rather farther apart than they should be 

 in a figure drawn strictly to the scale of two diameters.] 



Fig. 11. — Transverse section of the same, enlarged twice. 



Fig. 12. — Surface of the same, enlarged 6 times, showing the apertures of the 

 zooidal tubes. The lower part of the figure shows these openings concealed by a 

 thin calcareous membrane. 



Fig. 13. — Small portion of the tangential section of the same, enlarged 12 

 times, showing the minutely tubulated character of the skeleton-fibre. Owing to 

 the direction of the tubuli, they are necessarily cut across transversely in a 

 tangential section. 



Fig. 14. — Part of a longitudinal section of the same, showing the zooidal tubes, 

 and the minute tubuli running parallel with these, enlarged 12 times. In this 

 preparation the minute tubuli above spoken of are injected with some opaque 

 material. 



