. Bulletin of the Natural Histort Museum. Geology series. BRYOZOANS FROM CHATHAM ISLAND while being subjected to light sonication. Cheilostomes and shelly specimens with boring ctenostomes were mostly gold-coated and imaged using secondary electrons at IGNS. The majority of cyclostomes were left uncoated and examined in an environmental chamber with back-scattered electron detector attached to an ISI ABT-55 SEM at the NHM. Morphometric determinations were made using eyepiece micrometres or from micrographs. Class STENOLAEMATA Borg, 1926 Order CYCLOSTOMATA Busk, 1852 Suborder TUBULIPORINA Milne
. Bulletin of the Natural Histort Museum. Geology series. BRYOZOANS FROM CHATHAM ISLAND while being subjected to light sonication. Cheilostomes and shelly specimens with boring ctenostomes were mostly gold-coated and imaged using secondary electrons at IGNS. The majority of cyclostomes were left uncoated and examined in an environmental chamber with back-scattered electron detector attached to an ISI ABT-55 SEM at the NHM. Morphometric determinations were made using eyepiece micrometres or from micrographs. Class STENOLAEMATA Borg, 1926 Order CYCLOSTOMATA Busk, 1852 Suborder TUBULIPORINA Milne Edwards, 1838 Family STOMATOPORIDAE Pergens & Meunier, 1886 Genus STOMATOPORINA Balavoine, 1958 Type species. A/ecro/ncMnafa Hincks, 1859, by original desig- nation: Recent, (see Hayward & Ryland 1985). Stomatoporina sp. Figs 2, 3 Material. NHM BZ 4766, colony encrusting a pectinid bivalve shell. Description. Colony encrusting, a narrow branch, about 5 mm long and mm wide, initially uniserial and gently bowed, subsequently biserial and straight, lacking bifurcations but with beginnings of a single lateral ramification proximally; early astogenetic stages not preserved. Autozooids curved to left in uniserial part of branch, alternating in position of direction of curvature in biserial part; extent of frontal walls obscure, ridged distally, without preserved peristomes; apertures small, longitudinally elliptical, X mm, opening in a plane oblique to colony surface. Gonozooids absent. Kenozooids present at branch margins. Remarks. The sole specimen of this species is provisionally assigned to Stomatoporina on account of the curved proximal, uniserial branch with autozooids opening to one side and straight distal, biserial branch with autozooids opening alternately left and right. There is a particularly close resemblance in colony shape to a specimen of 5. spirata (Walford) from the Jurassic of Dorset figured by lilies (1975, fig. 2a, pi. 1, fig. 6
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