. Bulletin of the British Museum (Natural History). 120 PITT AND TAYLOR Remarks. Although this species is fairly common at Faringdon and there are good specimens in most collections, Canu & Bassler (1926) apparently had no specimens and did not mention it. The distinction between C. farringdonensis and H. keepingi is discussed above (p. 118). Genus TETROCYCLOFCIA Canu, 1917 Type species. Tetrocycloecia dichotoma Canu, 1917, = Ceriopora dichotoma Goldfuss 1827, sensu Reuss, 1848, by original designation; Miocene, Eisenstadt, Austria. Remarks. The emendation of the genus name Tetro
. Bulletin of the British Museum (Natural History). 120 PITT AND TAYLOR Remarks. Although this species is fairly common at Faringdon and there are good specimens in most collections, Canu & Bassler (1926) apparently had no specimens and did not mention it. The distinction between C. farringdonensis and H. keepingi is discussed above (p. 118). Genus TETROCYCLOFCIA Canu, 1917 Type species. Tetrocycloecia dichotoma Canu, 1917, = Ceriopora dichotoma Goldfuss 1827, sensu Reuss, 1848, by original designation; Miocene, Eisenstadt, Austria. Remarks. The emendation of the genus name Tetrocycloecia to Tretocycloecia by Canu & Bassler (1920) has been followed by most subsequent authors, but Nye (1976) gives reasons for regarding this as unjustified, and the original spelling is used here. Tillier (1975) and Nye (1976) have revised the type species of this genus, which in external morphology is very similar to T. midtiporosa described below from Faringdon. However, T. multiporosa has kenozooecial apertures which are more funnel-shaped than in T. dichotoma. Furthermore, the clearly- differentiated ooeciopore is far smaller than the autozooecial apertures in T. multiporosa, whereas it is indistinct and may be the same size as an autozooecial aperture in T. dichotoma. Further detailed study is necessary to resolve whether the two species are really congeneric. T. multiporosa may also be related to Sparsicavea d'Orbigny, 1853 (type species S. carantina d'Orbigny from the Turonian). Gynozooecial morphology, and autozooecial and keno- zooecial arrangement are similar, although the walls of the kenozooecia tend to be raised into prominent surficial ridges in Sparsicavea. Range. Aptian to Miocene. Tetrocycloecia multiporosa Canu & Bassler, 1926 Figs 118-123 71853 Sparsicavea irregularis d'Orbigny: 949; pi. 617, figs 5-7. 1926 Tretocycloecia (?) multiporosa Canu & Bassler: 83; pi. 16, figs 5-8. 1926 Tretocycloecia densa Canu & Bassler: 83; pi. 16, figs 9-14
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