82 ZOOLOGY. 
This coral ranges as far north as Nantucket and Buzzard’s 
Bay. In the mushroom corals, Fungia, the large corallum 
is the secretion of asingle polyp which may be a foot in 
length. Large branching corals abound on the reefs of 
Florida, the most abundant of which grows nearly two feet 
high and branches out like the horns of adeer. Such is 
Madrepora cervicornis Lamarck. 
While agamogenesis or alternation of generations is rare 
among the Actinozoa, Semper has observed two species of 
Fungia which he considers to reproduce in this way. The 
corals ‘‘bud out from a branched stem, and then become 
detached and free, as is the habit of the genus.’’ Moseley 
Fig. 54.—Coral polyp (Astroides calycularis) expanded.—From Tenney’s Zoology. 
also describes a similar case of production of three or four 
generations in a Tahitan species of Fungia. 
As a good example of the mode of development of one of 
the suborder Madreporaria, we will, with Lacaze-Duthiers, 
study the development of Astrotdes calycularis Pallas. 
The period of reproduction takes place between the end of 
May and July, the young developing most actively at the 
end of June. Unlike Actinia, which is always hermaphro- 
ditic, this coral is rarely so, but the polyps of different 
branches belong to different sexes, 
Asin the other polyps, including Actinia, the eggs and 
