PLATE I. 



MONTICULIPORA AVeSTONI. (pl»g0 7) 



Figure I. Tangential section, enlarged about thirty times. 



" \ a. Part of the same section, enlarged about ninety times. 

 '^ 16. Longitudinal section, enlarged about thirty times. 



MONTICULIPORA BlLLINGSI. (pagO 8.) 



Figure 2. Zoarium of this species incrustinga small cylindrical body, proliubly 



part of a crinoid stem. Natural size. 



" 2 a. Tangential section, enlarged about thirty times. 



" 2 6, Part of the same section, enlarged about ninety times. 



<^ 2 c. Longitudinal section, enlarged about thirty times. 



DiPLOTRyrA REGULARis. (pagc 13 ) 



Figure 3. Fragment of the zoarium. Natural size. 



" 3 a. Tangential section, enlarged about fifteen times. 



" 3 h. Part of the preceding section, enlarged a1)0ut ninety times. 



" 3 c. Longitudinal section, enlarged about thirty times. 



