~) 
SUB-ORDER D CHILOSTOMATA 289 
t 
the lower part of the peristome elevated into a more or less prominent mucro, Tertiary 
and Recent. 
Schizoporella, Hincks. Zoaria variable ; zocecial orifice varying from semi-circular 
to sub-orbicular, the lower margin with a distinct sinus. Cretaceous to Recent. 

Fic. 484. 
Mucronella coccinen, 
rE” ‘ Abildg. Miocene; Hisen- 
Paes stadt, Hungary. A num- Schizoporella cornute, 
Fic. 483 ber of zocecia enlarged G. and H.sp. Post- 
cae (after Reuss). The aper- Pliocene ; Santa Bar- 
Lepralia pallasiana, Moll. tures are denticulated, bara Co., Cal. Zoccia 
Recent; England. Zoccia and each zocecium has a highly magnified 
highly magnified (after pair of avicularia. 0, (after Gabb and 
Hincks)., Ovicell. Horn). 
Retepora, Imperato (Phidolophora, Gabb and Horn), (Fig. 486). Zoaria consisting 
usually of inosculating branches which spring from an encrusting base. Zocecia dis- 
posed on one face of the branches only, in most cases immersed. Primary orifice 
rounded or semi-elliptical with entire border. Afterwards the peristome becomes much 
A 

Fic. 486 Myriozowm punctatum, Phill. sp. Miocene; Ortenburg, Bavaria. 
: : A, Zoarium, !/;. B, Upper surface, enlarged. In the forward portion 
Retepora cellulosa, Linn. Crag; - the apertures are open, in the rear, covered over by a calcareous 
Suffolk, England. deposit. C, Cross-section of a branch. 
raised and multiform ; usually there is a fissure below, or there may be a prominent 
rostrum bearing an avicularium. ‘Tertiary and Recent. 
? Myriozoum, Donati (Myriopora, Blv. ; Vaginopora, Reuss), (Fig. 487).  Zoaria 
consisting of thick, dichotomously dividing branches, obtuse at their growing ex- 
tremities, and rising from an attached basal expansion. Zocecia 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 
zocecium, sub-orbicular, notched, or canaliculate below. As a rule, the openings are 
closed on the lower parts of the branches by a calcareous pellicle. Tertiary and 
Recent ; perhaps also Cretaceous. 
VOL. I U 
