. Bulletin of the British Museum (Natural History). FARINGDON SPONGE GRAVEL BRYOZOA 137. Fig. 153 Siphodictyum gracile Lonsdale, USNM 248243, syntype thin sections of 5. irregulare Canu & Bassler; 153A, transverse section, x 70; 153B, longitudinal section, x 21; 153C, shallow tangential section, x 34. used to distinguish S. irregulare are unsuitable for species discrimination in Siphodictyum. The slender branches of this species are common at Faring- don, and the species is widely distributed in the Barremian and Aptian of Europe. It is distinguished from the similar Laterocavea?
. Bulletin of the British Museum (Natural History). FARINGDON SPONGE GRAVEL BRYOZOA 137. Fig. 153 Siphodictyum gracile Lonsdale, USNM 248243, syntype thin sections of 5. irregulare Canu & Bassler; 153A, transverse section, x 70; 153B, longitudinal section, x 21; 153C, shallow tangential section, x 34. used to distinguish S. irregulare are unsuitable for species discrimination in Siphodictyum. The slender branches of this species are common at Faring- don, and the species is widely distributed in the Barremian and Aptian of Europe. It is distinguished from the similar Laterocavea? intermedia Canu & Bassler by the confinement of the autozooccial apertures to one side of the branches whereas they occur on two sides in intermedia. Family PETALOPORIDAE Gregory, 1899 Genu-, LATEROCAVEA d'Orbigny, 1853 Type SPECIES. Laterocavea dutempleana d'Orbigny, 18.^^3, by subsequent designation of Canu &. Bassler, 1926; Albian ol Grandpre. Remarks. Laterocavea is a canccllatc gciuis characterized bv a slight flattening ot the branches with autozooecia opening on both sides (cf. Siphodictyum, p. 133). Gregory (1899) regarded Laterocavea as a synonym of Hemicellaria d'Orbigny, 1850 {=Semicellaria d'Orbigny, 1853). However, the type species of Hemicellaria, H. ramosa d'Orbigny, has an 'eccentric bifoliate' colony-form { McKinney 1986) with branches which possess a distinct upper surface, as in genera such as Reticulipora and the cystoporates Goniocladia and Ramipora (see Utgaard in Boardman et al. 1983). Range. Aptian to Albian, ?Campanian; it is unclear whether a second, U. Cretaceous species, L. punctata (d'Orbigny) which was attributed by d'Orbigny (1850) to his genus, is really congeneric with L. dutempleana. Laterocavea dutempleana d'Orbigny, 1853 Figs 154^156 1853 Laterocavea dutempleana d'Orbigny: 933; pi. 772, figs 7-10. 1889 Idmonea dutempleana (d'Orbigny) Pergens: 350. 1899 Hemicellaria dutemplei (d'Orbigny); Gregory: 370. 1899 Petalopora cunnin
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