338 DISCOVERY REPORTS 



gymnocyst almost covered by single frontal avicularium. Oral shelf broad (Plate V, 

 fig. 5). Basal wall more or less narrow, absent in one or two marginal rows (Fig. 8 A) 

 where zooecia are triangular in transverse section. Marginal zooecia drawn out laterally, 

 zooecia of inner series symmetrical. 



Frontal avicularia (Fig. 5 B) graded in size from the margins to the centre of the 

 branch, largest on marginal zooecia, all directed obliquely proximally and towards the 

 nearest edge of the branch, beak slightly raised, curved or straight, mandible rather long 

 and sharply pointed. 



Ovicells unknown. 



i.av, 



m.z 



r.c. 



m a v. 



Fig. 8. A. Menipea zelandica sp.n. St. 935, New Zealand. The three marginal series of zooecia, separated 

 from the rest by eau de javelle, in basal view. Opesiae and rootlet-chambers shown with dotted line. 

 B. M. vectifera Harmer. St. 929, New Zealand. Large basal avicularium at intercalation of new series 

 of zooecia with underlying zooecia outlined. 



b.av. basal avicularium, b.w. basal wall of zooecium of inner series, i.av. internal avicularium, l.w. lateral 

 wall of inner series, m.av. marginal avicularium, m.z. marginal zooecium, r.c. rootlet-chamber. 



Remarks. This species resembles Menipea roborata (Hincks), which is also bilaminate, 

 in the shape of the zooecia and of their cryptocyst and oral shelf, in the spines, and the 

 rootlets. The frontal avicularia are unpaired and larger ; the rootlet chambers are larger 

 and the zooecia are distinctly larger. The branches show less terminal widening and are 

 frequently curved, cf. the straight or concave margins of the branches of M. roborata 

 in Plate V, fig. 4 and the curved branches with one margin convex and the other concave 

 to the right of the colony of M. zelandica, Plate V, fig. 3. 



