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. Alecto incurvata Hincks, 1859, by original desig- 
nation: Recent, U.K. (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 0.25—0.48 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, 0.06 
x 0.04 mm, opening ina plane oblique to colony surface. Gonozooids 
absent. Kenozooids present at branch margins. 
REMARKS. The sole specimen of this species is provisionally 
5 
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 S. spirata (Walford) from the Jurassic of Dorset figured 
by Illies (1975, fig. 2a, pl. 1, fig. 6). Only three species of this Middle 
Jurassic (Bajocian) — Recent genus have been described (see Illies 
1975; Hayward & Ryland 1985; Pitt & Taylor 1990), all from 
northern Europe. Therefore, the recognition of a probable 
Stomatoporina species in New Zealand greatly extends the known 
geographical range of the genus. More material is required before 
formally describing the species as new. 
Family ONCOUSOECIIDAE Canu, 1918 
Genus ONCOUSOECIA Canu, 1918 
TYPE SPECIES. Tubulipora lobulata Hincks, 1880 (=Alecto dilatans 
Johnston, 1847; see Hastings 1963), by original designation; Re- 
cent, U.K. 
2Oncousoecia sp. 
NHM BZ 4767. 
{not figured] 
MATERIAL. 
DESCRIPTION. Colony small, fewer than 10 zooids being pre- 
served, encrusting, initially uniserial, becoming bi- or triserial; 
ancestrula lacking or not identifiable. Autozooids with transversely 
elongate apertures about 0.10 mm long by 0.12 mm wide. 
REMARKS. This small, immature colony lacks gonozooids and is 
therefore of highly uncertain affinity. However, the oligoserial zo- 
oids are reminiscent of some species of Oncousoecia to which the 
colony is very provisionally assigned. Alternatively, the specimen 
may be an immature Tubulipora or the encrusting base of an erect 
genus. 
Figs 2-3 Stomatoporina sp., NHM BZ 4766. 2, entire colony with short lateral ramification arrowed, x 18. 3, uniserial proximal branch, x 115. 
