PLATE XXIX. 



Fig. 1. — Part of a polished transverse section of a specimen of St achy odes 

 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 astern 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., enlai'ged 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, Buchel (Paffrath District). 



Fig. 11. — Part of the vertical section of the preceding specimen, similarly 

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



