148 
CELLULTPOEA. 
Char. — According to Pergens the type is -svern and indeterminable ; d’Orbigny’s 
description of tbe very small zocecia, and of tbe cotes formed by tbe junction of 
wbat is apparently tbe zoarial lamina, suggests that tbe species may be a mucb 
worn Cellulipora. 
Distrib. — Senonian — Coniacian : Yilledieu, Loir-et-Cber. 
3. ? sulcata, Seeley, 1 866 . 
Syn. Cellulipora sulcata, Seeley, 1866. Foss. Yp. Gr. Hiinst. : Ann. Mag. 
Nat. Hist. ser. 3, vol. x\di. p. 181. 
Diastopora [Cellulipora) sulcata. Vine, 1891. Eep. Cret. Polyz. : Pep. 
Brit. Assoc. 1890, p. 395. 
Char. — Zoarium a flat sheet covered by bosses. Zooecial groups separated by 
depressions, on which open rudimentary zocecia. Described as albed to 
Reptomultisparsa soiverbyi. 
Distrib. — Red Chalk : Hunstanton. 
Family IDMOXIID^. 
Synonyms. 
Idmoniid(c, pars. Busk ; Pergens ; Macgillivray ; Marsson, etc. 
Tuhuliporidcc, pars, Johnston ; Smith ; Busk ; Hincks, etc. 
Tubigeridce, pars, d’Orbigny. 
Diagnosis. 
Cyclostomata Tiibiilata in whicli the zooecia are simple and 
tubular, and are grouped into adnate or erect, simple or 
branched zoaria. The apertures occur on the obverse face 
only, though the reverse face may be reduced and almost 
vestigial. The apertures occur in regular series, which are 
usually transverse, but may be divergent ; the transverse series 
are generally alternate. The walls of the zooecia are solid. 
Ceetaceous Hepeesentatives. 
The Idmoniidae are represented in the Jurassic by only one 
genus and one adequately known species. In the Cretaceous 
system the family is almost at its zenith. In later periods there 
were individuals larger than any known from the Cretaceous, 
but the range of variation is smaller. The subdivision of the 
Cretaceous ‘ species ’ into genera is difficult ; and the naming of 
the groups is rendered complex owing to the use by neontologists 
