. Bulletin of the British Museum (Natural History). HIPPOPORIDRA EDAX 1A5 f • picardi littoralis. 01 ft* edax senegambiensis lusitania h i Fig. 3 Shape of the autozooidal orifice and rostrum of the interzooidal avicularium in five species of Hippoporidra. Interzooidal avicularia were not located in studied specimens of H. lilloralis. Scale bar is 0-1 mm. monticulate and occasionally branched. Autozooids with marginal pores and scattered or absent frontal pores. Calcified frontal shields cryptocystidean, with overlying hypostegal coelom. Orifice cleithridiate with strong lateral condyles; oral
. Bulletin of the British Museum (Natural History). HIPPOPORIDRA EDAX 1A5 f • picardi littoralis. 01 ft* edax senegambiensis lusitania h i Fig. 3 Shape of the autozooidal orifice and rostrum of the interzooidal avicularium in five species of Hippoporidra. Interzooidal avicularia were not located in studied specimens of H. lilloralis. Scale bar is 0-1 mm. monticulate and occasionally branched. Autozooids with marginal pores and scattered or absent frontal pores. Calcified frontal shields cryptocystidean, with overlying hypostegal coelom. Orifice cleithridiate with strong lateral condyles; oral spines absent. Most autozooids are frontally-budded between monticules and are irregularly shaped. Cortical zooids, situated on monticules, are larger than autozooids but have a smaller orifice. Ovicells are hyperstomial, imperforate, with an uncalcified frontal area, and are not closed by the operculum. Avicularia are small and adventitious or large and interzooidal. Type species. Cellepora edax Busk 1859, by original designation; Pliocene, Suffolk. Remarks. Using established correlates of character states of orifice shape and avicularian skeletal morphology (cf Hayward 1978), five species oi Hippoporidra may be recognized (see key below and Fig. 3): H. edax (Busk), H. lusitania sp. nov., H. littoralis Cook, H. picardi Gautier and H. senegambiensis (Carter). The only species known as a fossil is H. edax and this is present in deposits of the early Miocene onwards. Living North American species of Hippoporidra are inadequately known and, in addition to probable H. edax, include some undescribed species. Lepralia edax forma janthina Smitt 1873 was formerly regarded as Hippoporidra janthina (Smitt) but has since been shown to be a species of Hippotrema (Cook in press). Key to species of Hippoporidra (see Fig. 3). 1. Narrow rounded poster; interzooidal avicularia with either broad (simple pivotal bar) or pear-shaped (ligulate pivotal bar) rostra H. picardi. Please note that thes
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