. Cassell's natural history. Animals; Animal behavior. 293 NATURAL HISTORY. have a spiny outside. This genus is the tj-pe of a sub-family* in which there is a row of pali, and it is found that the interseptal spaces, when the soft parts are washed away, are open throughout. One genust increases by budding, and is therefore compound. A sub-family which is but slightly represented now, and which had a great development in the Secondary and Tertiary ages, is that of the Trochocyathaceje, and it has more than one row of pali, and consequently as many extra rows of tentacles. Several of its genera
. Cassell's natural history. Animals; Animal behavior. 293 NATURAL HISTORY. have a spiny outside. This genus is the tj-pe of a sub-family* in which there is a row of pali, and it is found that the interseptal spaces, when the soft parts are washed away, are open throughout. One genust increases by budding, and is therefore compound. A sub-family which is but slightly represented now, and which had a great development in the Secondary and Tertiary ages, is that of the Trochocyathaceje, and it has more than one row of pali, and consequently as many extra rows of tentacles. Several of its genera are now repre- sented in tlie deep sea, and Deltocyathus is the most widely distributed, being found, moreover, at the depth of 2,250 fathoms. Ajiother sub-family is tliat of the Turbinolina;, and it is characterised by the simplicity of the hard parts, there being the cup or wall, septa, and cost*. Sometimes the columella exists, and an epitheca, but pali are not seen. Some of these simple forms are extinct, and the majority still live. They are divided into genera by the shape of the Coral, which, for instance, is compressed and fan-shaped in Flabellum and wedge-shaped in Sphenotrochus; and by the nature of the columella, which styliform in Turbinolia and fascicular in others. Some, such as Blastotrochus, bud on the outside. Many of the species of this sub-family are dwellers on the floor of the deep .sea, and the fossil forms ai-e very numerous. The third sub-family is that of the Dasmidte, and the only genus is extinct. FAMILY OCULINID^. These are branching Corals, which bud on the outside of the stem, or on tlie edge of the calices, and have these last resembling, more or less, those of tlie family just noticed. There are, however, dissepiments in the interseptal spaces of some, and in the common Lophohdia, jn-oli/era, found on the floor of the North Atlantic, horizontal layers of hard tissue may cross the whole internal cavity, and are called tabulie. Moreover, the lo
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