ORDER V 



CHEILOSTOMATA 



353 



semicircular to sub-orbiculai', the lower margin with a distinct sinus. Cretaceous to 

 Eecent. 



Family 14. Meniscoporidae Cann. 



This family is characterised by the occurrence of three kinds of zocecia : (1) 

 typical zocecia, (2) genesies or zooecia bearing internal ooecia, and (3) avicularia. 

 Alumdant in Tertiary. 



Meniscopora Gregory. Aperture constricted as in Hippo forina. 



Schizostoma Canu. Like Schizoporella but with genesies. 



Poristoma, Poricella, Smittistoma and Galvetina Canu ; Lobopora Levinsen. 



Family 15. Reteporidae Smitt. 



Eefepora Imperato {Phidolophora Gabb and Horn) (Fig. 523). Zoaria consisting 

 usually of inosculating branches which spring from an encrusting base. Zocecia 

 disposed on one face of the branches only, in most cases immersed. Primary orifice 



;.V'..-V:.v.'x.;-:.-;^-; 



'■':;-V.s?ifi 





Fig. 524. 



Fig. 523. 



Retepora cellulosa Linn. Crag ; 

 Suffolk, England. 



Myriozoum pwndatuiii (Phill.). Miocene ; Ortenburg, Bavaria. A, 

 Zoarium, i/i- B, Upper surface, enlarged. In the forward portion the 

 apertures are open ; in the rear, covered over by a calcareous deposit. 

 C, Cross section of a branch. 



rounded or semi-elliptical with entire border. Afterwards the peristome becomes 

 much raised and multiform ; usually there is a fissure below, or there may be a 

 prominent rostrum bearing an avicularium. Tertiary and Recent. 



Family 16. Myriozoidae Smitt. 



Myriozoum DoTiB.ii (Myriopora Blainv. ; Vaginopora Reuss) (Fig. 524). Zoaria 

 consisting of thick, dichotomously dividing branches, obtuse at their growing ex- 

 tremities, and rising from an attached basal expansion. Zooecia disposed about an 

 imaginary axis, even at the surface, their boundaries scarcely distinguishable. Entire 

 surface and also the inner walls minutely porous. Orifice above the centre of the 

 zooecium, sub-orbicular, notched or canaliculate below. As a rule, the openings are 

 closed on the lower j^arts of the branches by a calcareous pellicle. Tertiary and 

 Recent ; perhaps also Cretaceous. 



Family 17. Celleporidae Busk. 



Zocecia urceolcote, more or less erect, and irregularly crowded together ; often forming 

 several or many superimposed layers. 



Cellepora Fabricius, emend. Busk (Spongites Oken ; Celleporaria Lamx.) (Fig. 

 525). Zoarium multiform, encrusting, or erect and ramose. Zocecia in the older 

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