﻿PLATE XXIX. 



Fig. 1. — Part of a polished transverse section of a specimen of Stachyodes 

 verticillata, M'Coy sp., of the natural size. From a Devonian pebble in the 

 Triassic conglomerates of Teignmouth. 



Fig. 2. — Part of a polished vertical section of the same species, of the natural 

 size. From the same locality. 



Fig 3. — Part of a polished section of a specimen of Devonian limestone 

 containing numerous stems of Amphipora ramosa, Phill., sp., of the natural size. 

 Shaldon, South Devon. 



Fig. 4. — Part of a longitudinal polished section of Amphipora ramosa, Phill. 

 sp., enlarged about 10 times. Shaldon, South Devon. 



Fig. 5. — A transverse polished section of a stem of the same species, similarly 

 enlarged. Shaldon, South Devon. 



Fig. 6. — Part of transverse thin section of a stem of Amphipora ramosa, Phill., 

 sp., in which no axial canal is shown, and the marginal vesicles are comparatively 

 small, similarly enlarged. Shaldon, South Devon. 



Fig. 6 a. — A portion of the preceding section, enlarged still further, showing 

 the structure of the skeleton-fibre. 



Fig. 7. — A polished transverse section of a stem of Amphipora ramosa, Phill., 

 sp., enlarged about 10 times. No axial canal is seen in this section, and the 

 marginal vesicles are comparatively small. Shaldon, South Devon. 



Fig. 8. — Part of a transverse section of a specimen of Devonian limestone 

 containing a colony of Idiostroma oculatum, Nich., of the natural size. Shaldon, 

 South Devon. 



Fig. 0. — Part of a thin section of the preceding specimen, showing a single 

 stem transversely divided ; enlarged 10 times. Shaldon, South Devon. 



Fig. 10. — Part of a tangential section of a stem of Idiostroma oculatum, Nich., 

 enlarged 10 times, showing Caunopora-tubes (?) and tabulate canals. Middle 

 Devonian, Biichel (Paffrath District). 



Fig. 1 1. — Part of the vertical section of the preceding specimen, similarly 

 enlarged, showing the axial tabulate canal, and a (?) Caunopora-tube. 



