390 Mr. W. King on some Families and Genera of Corals, 
longitudinal series. Series of cellules separated from each other 
by a dividing ridge. (?) Gemmuliferous vesicles on the dividing 
ridges. | in 
Type, Ceratophytes anceps, Schlotheim : a Permian species. 
This genus, which differs from Thamniscus in its mode of 
branching and some other characters, is proposed for certain 
corals usually bearing the obsolete name Glauconome, proposed 
by Goldfuss for some species previously placed in Vineularia by 
De France. 
Fam. ELasmororip2, King. 
This group agrees with Escharide in the structure of its po- 
lypidoms or cellules, but differs therefrom in being uni-lamello- 
celluliferous and reticulated. Only the following genus is known ~ 
to the writer. 
Gen. Elasmopora*, King. 
The typical Elasmoporidia, consisting of infundibuliform, folded, 
perforated fronds or foliaceous expansions, which are entirely cel- 
luliferous ; the cellules opening on their inner or upper surface. 
Cellules arranged alternately, and running more or less parallel 
to the plane of the fronds; their front and dorsal walls forming 
the two faces of the fronds. Cellule-apertures approximating 
more or less to a position at right angles to the plane of the 
fronds, furnished with tubular and other processes on their in- 
ferior or projecting margin. Gemmuliferous vesicles overlying the 
cellule-apertures. Both surfaces of the fronds foraminated. Outer | 
or under surface of the fronds marked with distant waved lines, 
forming the boundaries of the cellules. 
Type, Millepora cellulosa, Linneus : a species occurring in the 
Mediterranean, An allied species (Elasmopora Beaniana, King) 
inhabits the British seas. . 
The type given above is usually placed in Retepora (=Krusen- 
sternia, Lamouroux, and Frondipora, Blainville) ; but this genus, 
considering the structure of its typical species, the Millepora 
reticulata of Linnzeus, is not only distinct from Hlasmopora in a 
generic point of view, but it evidently belongs to a different 
family group. Elasmopora externally resembles Phyllopora ; but 
the want of a basal plate composed of vertical capillary tubuli m 
the former, and the presence of some important differential cha- 
racters in the latter, completely and widely separate both genera 
from each other. 
Further details on the foregoing groups and some of their 
species are given in the author’s forthcoming monograph. 
* Etym. €Aacpa, a plate ; rdpos, a perforation. 
LATER de bs 
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