1(36 
THE OCEAN WORLD. 
from the madrepores by Linnaeus, along with a great number of 
species distinguished by the minuteness of their pores or polypiferous 
cells (Fig- 79), represented above, as nearly allied, and, perhaps, 
identical, with Dr. Johnston’s Cellepora cervieornis , a species found 
in deep water on the Devonshire and Cornwall coasts, and, indeed, all 
round our west coast. “ A single specimen of this millepore is 
about three inches in height,” says Dr. Johnston, “and somewhat 
more in breadth. It rises from a broad flattened base, and begins 
immediately to expand and divide into kneed branches or broad seg- 
of a highly-developed mural system. The visceral chambers are 
divided into a series of stages or stories, by perfect diaphragms or 
plates placed transversely, the plates depending from the nulls and 
forming perfect horizontal divisions, extending from one wall of the 
general cavity to the other. In order that the reader may form some 
idea of the Tabulate Madrepores, one of the polypiers known as 
millepores is here represented. The millepores were first separated 
Fig. 79. Millopora alciconiis (Lmn.), one-fourth natural size. 
