COLLECTED BY DR WILLEY. 131 



EXPLANATION OF PLATES XII.— XVI. 



Plates XII.— XV. 



A series of Woodburytype reproductions of photographs <>f MiUepora alcicornis taken by 

 Mr L T. Wadaworth. 



Fia. 1. A specimen of the fades ' dicholoma,' £ natural size. Some of the pores in this 

 and the following figures show a white central spot like a columella. This is an effect 

 of light and does not represent any actual structure. 



Figs. 2 and 3. Two pieces of a young form of the facies ' complanata,' | natural size. Both 

 of these photographs show the pore systems well-marked and distinct on the general 

 smooth surface but confused at the edges and on the summits of the tubercles. The 

 manner in which the young Millepore encrusts a dead coral is well shown in fig. 2. 



Pig. 4. A piece of a large lamella liclonging to the facies 'complanata,' | natural size. The 

 surface of this piece is generally smooth, but two rounded prominences marked by the 

 cirripede hole may be seen. 



FlG. 5. A specimen belonging to the facies 'complanata' covering a dead piece of coral, \ 

 natural size. 



Figs. 6 and 7. A specimen of very irregular facies. 



Fig. 6. £ natural size, Liken to show in the middle a knob from which the live coral has 

 been broken off, revealing the dead coral on which it has grown, and which has given 

 it the character of its form. 



Fig. 7. f natural size, showing the whole specimen. To the left a portion of the whole 



is of the form of growth described by authors as M. complanata, in the middle that 



described as M. verrucosa, and to the right that of M. nodosa. The summits of several 

 of the tubercles are marked by cirripede holes. 



Fig. 8. A specimen of the facies 'verrucosa,' J natural size. 



