14 FREDERICK IV. SARDESON 



this species, the angles project inwards, as if produced. More- 

 over the lunarial wall is a little elevated at the surface, making 

 it appear as a distinct wall, but it is really part of the wall 

 deflected and extended. I have searched in vain for the sym- 

 metrical crescent that has been figured as the lunarial structure 

 of this species. It appears really to be somewhat irregular, 

 bearing tooth-like points, the downward projections of which 

 appear lucid in thin sections, and are the "vertical, closely-tabu- 

 lated tubes" described by the author of the genus and species. 

 These same lucid spots in sections crossing calcite-filled cells 

 are very deceptive, appearing like pores. In clay-filled cells 

 they appear clearly as parts of the wall. They interrupt the 

 median wall and confuse in color with the outer laminae, these 

 lighter parts being also of the same color as calcite infiltration ; 

 hence the deception in the fossil. 



Fistulipora carbonaria Ulr. is of common, massive growth. Its 

 autocells are rounded, with here and there one having a slight 

 distension, as if a lunarium was developed with minimum dis- 

 tinctness. The autocells are separated by angular, large meso- 

 pores in single series, except in the clusters or maculae, where 

 they are more numerous. The walls around autocells are thick, 

 while those between mesopores are very thin, low, and scarcely 

 above the last tabulae ; hence the appearance is that of isolated 

 autocells with raised "peritreme." Longitudinal section shows 

 the mesopores to have arched, numerous tabulae, appearing thus 

 as vesiculose filling, or " ccenenchyma " between the autocells. 

 New autocells arise abruptly, displacing one or more mesopores 

 in the midst of mesopores, i. e., " ccenenchymal gemmation." 



Stellipora a?itheloidea Hall encrusts shells, etc., growing 

 laminar or massive, a centimeter thick. The surface is crowded 

 with stellate monticules about 2.5 mm wide, each consisting 

 of a central, six to twelve-rayed, depressed, quite smooth, 

 macula, and around this, between its rays, an equal number of 

 ridges which are highest at the inner end and slope outward to 

 the interspace. Sometimes additional ridges occur midway 

 between the outer ends of the primary ones. The maculose 



