the Genus Fistulipora, M^Coy, 



501 



pores in an inch). Acanthopores are wanting. The auto- 

 pores are intersected bj comparatively remote complete 

 tabulse. The mesopores are crossed bj more closely-set tabulae, 



Fig. 3. 



Fistulipora incrustans, Phill., sp. A. Fragment of the corallum of the 

 natural size. B. Section of the same, to show vertical thickness. 

 C. Portion of surface, showing the autopores with their raised lips, 

 and the mesopores occupying the intervening spaces, enlarged about 

 twenty times. D. Transverse section, similarly enlarged, showing 

 fission in some of the mesopores. E. Longitudinal section, similarly 

 enlarged : a, autopores ; m, mesopores ; c, primary cells. 



which, owing to the incomplete nature of the walls of the 

 mesopores, often give rise to a sort of vesicular tissue. The 

 " macular " are composed wholly of mesopores. 



Ohs. As regards the synonymy of this species, we have ex- 

 amined the original specimen of the Galamopora incrustans of 

 Phillips, from the Carboniferous Limestone, now preserved in 

 the British Museum, and we are satisfied as to its identity 

 with the Northumbrian and Scotch examples of Fistulipora 



