. Bulletin of the British Museum (Natural History). 48 ENGESER & TAYLOR. Fig. 6 1 Cassianochaetetes milleporatus (Miinster). Cassian Fm., St Cassian. S10468. A, side view showing columnar form and multiple epithecae, x 3-8. B, scanning electron micrograph of thecal surface, x 16. C, section, x 32. irregular tufts of aragonite crystals. Wall structure is elongate spherulitic. There are no spicules incorporated in the walls. Measurements (in mm) calicle diameter: mean range N wall thickness SI0466 0-18 0-026 0-12-0-24 20 0-03-0-06 Remarks. The species 'Calamopora' ? gnemidium
. Bulletin of the British Museum (Natural History). 48 ENGESER & TAYLOR. Fig. 6 1 Cassianochaetetes milleporatus (Miinster). Cassian Fm., St Cassian. S10468. A, side view showing columnar form and multiple epithecae, x 3-8. B, scanning electron micrograph of thecal surface, x 16. C, section, x 32. irregular tufts of aragonite crystals. Wall structure is elongate spherulitic. There are no spicules incorporated in the walls. Measurements (in mm) calicle diameter: mean range N wall thickness SI0466 0-18 0-026 0-12-0-24 20 0-03-0-06 Remarks. The species 'Calamopora' ? gnemidium Klipstein, 1845 has very often been misinterpreted. This is partly because KHpstein (1845) figured under this name three different specimens, each a different species, and the species- group name gnemidium has never been restricted to any single one of these specimens. However, Woehrmann (1889) restricted 'Calamopora' gnemidium to the two specimens figured by Klipstein (1845) as pi. 19, figs 15a and 15b (BMNH S10466 and S10464 respectively). Since the specimen figured on pi. 19, fig. 15b is a coral overgrown by a calcified demosponge (= Leiospongia sp., p. 43), the specimen figured on pi. 19, fig. 15a is here chosen as the lectotype of 'Calamopora' gnemidium Klipstein, 1845. Two different spellings of the species name appear in the literature, gnemidium and cnemidium. It is evident from Klipstein's paper that gnemidium is the original spelling; cnemidium is therefore an incorrect secondary spelling with- out nomenclatorial validity. Most other references to this species cannot be verified because of the insufficiently detailed descriptions given. An exception is the reference to 'Ceriopora gnemidium' in Bizzarini & Braga (1978) who described the species as showing '.. a structure made of granular calcific laminae'. Their material certainly does not belong to Cassianochaetetes gnemidius (Klipstein). ? Cassianochaetetes milleporatus (Miinster, 1841) Fig. 6 1841 Achilleum mill
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