OBSERVATIONS ON LIVING SPECIMENS. 13 
tribution to the mass of material. With it, in crevices of the dead 
coral, was a new species of Haliphysema. 
On the eel-grass (Posidonia), which forms considerable areas in 
shallow water inside the reef, there is an association of several 
species. Jridia, Planorbulina, Discorbis, Orbitolites, with a peculiar 
miliolid which spreads over the surface, form the greater number of 
these. The mass of these must add appreciably to the amount of 
carbonate of lime added to the bottom. The forms are rapid in 
their growth, as the leaves of Posidonia are quickly covered in their 
growth by Foraminifera and other incrusting animals. 
