MADREPOR^A. 



MADREPOR^A. 



ThU group of Schweigger if not considered u really generic. 



Cttciuopora. Animal* unknown ; cell* infundibuliform,quincuncial, 

 forming the openings of capillary tabes laterally adherent into an 

 attached polymorphous polypidom. 



This group, established by Goldfnss, is ranked by that author near 

 to Rdrpora. There is apparently no evidence that it should be placed 

 among the Madrrporaa. 



a ifumditmltfarmit(ao\AtoM, pi 9 and pi 80, f. 10) is an example. 



Gemmipora. Animals without tentacula; cells deep, cylindrical, 

 channelled, and almost lamelliferous within, prominent in a mnminil- 

 lary furm on the surface of a fixed, porous, urborescent, or laminifonn 

 polypidom. Several of Lamarck's Erfltmarue come into this group. 



U. mrtatttrina (Ellis and Sol., t 43) may be taken as an example. 



Cfmmipora mrteHlerina, diminished. 

 a, portion, natural rite. 



tfmlipora. Animals actiniform, short, provided with small tenta- 

 eula to the number of twelve, placed in a single series ; cells very 

 small, rounded, impressed, regular, with few internal grooves. 

 Polypidom incrnsting or agglomerated, very porous, much echinulated, 

 and marked by mammillary prominences on the free surface. Some of 

 Lamarck's Puritci are included in this genus. 



Portia rermrota, Lamarck, an Australasian genus, in an example. 



Madrrpora. Animals actiniform, rather short, with twelve simple 





Uadirpora atrrvtammJrii, iliminilict!. 

 , tmnlnilion of on* of Ike (tmnch, natural ;/ 



tentacula; cells deep, prominent, scarcely stelliferous, irregularly 

 scattered on the surface, and accumulated towards the terminations 

 of the polypidom, which is very porous, arborescent or frondescent, 

 and fixed. 



ThU restricted genus includes several recent species, and a few 

 fossils. 



M. alirotanoiila, Lamarck; M. muricata, Linn. (Ellis and Sol., t, 57), 

 is an example. 



1'almipora. Animals unknown ; cells very small, unequal, com- 

 pletely immersed, obsoletely radiated, scattered ; polypidom fixed, 

 cellular within, very ,fincly porous and reticulated externally, 

 expanded in a palmate or digitated form. 



The genus includes MUlepora alcicornit of Linnaeus and others 

 like it. 



M. alcicornit, Linn., may be token as an example. 



ilitlepora atricorhu. 



Udiopora. Animals short and cylindrical, with a crown of 15 or 

 16 broad and short tentacula; cells cylindrical, vertical, or subdiver- 

 gent, immersed, internally crenulated by partial lamella; ; polypidom 

 largely porous in the interval of the cells. 



ff. ctrrulca (Madrrpora cirrulca, Kllis and Sol.,' 1 1 2, f. 4 ; Pocillopora 

 carulea, Lamarck), a species from the equatorial seas, is an example. 



A fossil species in the Tranition Limestone (A tinea porom, Gold.), 

 usually ranked in this genus, in put in Portia by Khrenberg and Long- 

 dale. (Murchison's ' Silurian Region.') 



Alreopora. Animals actiniform, with 12 simple tentacula; cells 





Atrropora reltfora. 



