338 R. M. Brydone—New Chalk Polyzoa. 
always interstitial and sometimes impinge sharply on the adjoining 
zocecia. 
This species occurs in the zone of JL. cor-testudinarium in Hants, 
and probably in those upper beds which for Dr. Rowe are the lower 
fourth of the zone of If. cor-anguinum. Ihave only one specimen, 
and should not have described it but for its apparent serial relation- 
ship to JL. fascelis. 
MemBraNIPORA FERONIA, sp. nov. (Pl. XIV, Fig. 4.) 
Zoartum unilaminate, adherent. 
Zoecia definitely pyriporiform, with a long and generally very ~ 
slender tapering external front wall; areas narrowly elliptical, 
average length 45 to ‘5 mm., breadth -27 mm., separated from the 
external front wall by a slender but definite rim. 
Oecia wide and slightly heel-shaped in ground-plan, not numerous. 
Avicularia much like those of JZ. fascelis, even to the occasional 
vicarious specimens, but smaller, and in proportion much narrower, 
and placed centrally above the zocecia as a rule; the crossbar is 
undoubtedly calcareous, being frequently preserved ; it divides the 
aperture into two nearly equal parts, the upper being slightly the 
_ larger. 
‘his species is rare in the zones of A. quadratus (restricted) and 
B. mucronata in Hants. It closely resembles Keptoflustrella ovalis, 
D’Orb.,! the only clear distinction lying in the avicularia, which in 
R. ovalis are smaller, quite different in shape, and devoid of any 
suggestion of crossbar; but the resemblance can only be accidental 
if Canu is right in identifying the latter species with Semeflustrella 
rhomboidalis, D’Orb.,? which is palpably distinct from JL. feronia. 
MeEMBRANIPORA FLACILLA, sp. nov. (Pl. XIV, Fig. 5.) 
Zoarium unilaminate, adherent. 
Zoecia feebly pyriporiform, with very short and rapidly tapering - 
external front wall; areas distinctly large, length °55 to *65 mm., 
breadth °38 to'4 mm., elliptical and definitely flattened at the upper 
end, and separated from the external front wall by a faint rim; just 
outside the two corners formed by the flattening of the upper end 
a pair of pores occurs very regularly in a swelling of the rim. 
Oewcia broad and slightly heel-shaped in ground-plan, fairly 
numerous. 
Avicularia corresponding almost exactly with those of IL feronia; 
the ends of the crossbar are about half-way up the aperture. 
‘This species is rare in the Weybourne Chalk (zone of B. mucronata), 
and is apparently the last of the English series, as I have not met any 
representative in the Trimingham Chalk. 
MEMBRANIPORA FLAMMIA, sp. nov. (Pl. XIV, Figs. 6, 7.) 
Zoartum unilaminate, adherent. 
Zowcia rather small, the initial zocecia of new rows feebly pyri- 
poriform, more as it were of necessity than by choice; areas in the 
1 Pal. Terr. Crét. Franc., v, p. 571, pl. 731, figs. 17, 18. 
2 Thid., p. 564, pl. 730, figs. 5-8. 
