FAMILIES AND GENE HA OF THE MADllKPOKAEIA. 



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a])|)ear isolated, but are continuous with laminse that extend downwards. 

 Sometimes these boss- or chib-shaped septa are found beyond the cahees 

 and between sets of them, and thus resemble the tentacular septa of the 

 family Fungidae. Here and there great confusion of calices and these septa 

 is apparent. The costse are indefinite, but they are continuous with the septa, 

 and reach over linear elevations, and sometimes cover much space. They 

 often bifurcate. Septa solid, spinulose, connected by numerous small 

 synapticula. Wall formed by synapticula, which exist between the costse 

 also. Gemmation and rarely fissiparity. 



Distribution. — Recent. Indian Ocean, Chinese seas, Pacific. 



Fsammocora, Dana, was splendidly illustrated by Dana in his great work, 

 and the remarkable superficial views given, are often strikingly correct. 

 But with age and after death deposit of carbonate of lime occurs, in the 

 first instance consolidating the tissues, and in the other adding to their 

 density. Sections, or rather fractures, made longitudinally and trans- 

 versely, prove that the septa are solid, stout, spinulose at the free surface, 

 and that synapticula abound. There is some ccenenchyma between coral- 

 lites here and there, sometimes forming monticules ; and it is evident that 

 fissiparity may occur, but it is rare. Under the circumstances the genus 

 must be removed from the section Perforata into that of the Fungida, 

 family Loplioseridae, near Plesioseris, nobis. 



The following uiue genera are new : — 



Antillastrsea, p. 108. 

 Brachymseandrina, p. 90. 

 DiplothecastrjBa, p. 115. 

 Koilocoenia, p. 115. 

 . Nototrochus, p. 17. 



Pliysophyllia, p. 118. 

 Pourtalosmilia, p. 72. 

 Pratzia, p. 160. 

 Zittelofungia, p. 150. 



Total number of genera recorded, after revision, 343 out of 478. 



LINN. .rOlTRN.'—ZOOLOn Y, VOL XV III 



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