TO. 1323. STR UCTURA L FEA TV RES OF HOMOTR YPA—BASSLER. 571 



lig. 5) its width often equals that of the zooecium itself. Often the 

 [xranules or dots are arranged in regulaj", transverse lines, and give a 

 vrery pretty appearance in sections. Figures 2, 3, and. 4, on Plate XX, 

 show similar intermural str^icture in Uttepora columnifera Busk, a 

 chilostomatous bryozoan, and. in Eseharopora pavonla (D'Orbigny) a 

 typical example of the order Cryptostomata. 



The following tables, showing the geologic and geographic distribu- 

 tion and the specific characters, are here introduced to aid in the iden- 

 tification of the species: 



