66 
THE VOYAGE OF H.M.S. CHALLENGER. 
crested helmet is very striking. In the fertile zooecia both the marginal spines or their 
basal joints persist in front of the ocecium. 
(3) Amphiblestrum papillatum, n. sp. (PI. XXXIII. fig. 1). 
Character. — Zoarinm very delicate and thin, closely adherent to shell. Zooecia more 
or less disjunct, leaving angular spaces. Area in the younger zooecia oval, in the older 
irregularly pyriform. Orifice ovate, occupying about half the area. Surface of lamina 
finely granular. Small avicularia having a triangular mandible on small papillary 
eminences seated in the angular interzooecial spaces. 
Habitat. — Station 208, lat. 11° 37 ' N., long. 123° 31' E., 18 fathoms, blue mud. 
(4) Amphiblestrum cervicorne, Busk. 
Membranipora cervicornis, Bk., Brit. Mus. Cat., vol. i. p. 60, pi. c. fig. 3, Macgilliv., Nat. Hist. 
Viet., Dec. iii. p. 32, pi. xxv. fig. 8. 
Character. — Frontal area oblong or oval ; a strong, much projecting process arising at 
each upper angle, branching like a stag’s horn and bending over the front, usually 
meeting and sometimes inosculating ; several other simple or forked, marginal spines. 
Ooecia galeriform, crowned with a small avicularium. 
Habitat. — Station 162, off East Moncoeur Island, Bass Strait, 38 fathoms, sand and 
shells. 
[Williamstown, Victoria, Macgillivray.] 
(5) Amphiblestrum umbonatum, Busk. 
Membranipora umbonata, Bk., Brit. Mus. Cat.,p. 57, pi. lxxiii. figs. 6, 7 ; Macgilliv., Nat. Hist. 
Viet., Dec. iii. p. 31, pi. xxv. fig. 6. 
Character. — Area broadly elliptical ; border low ; a jointed spine on each side of the 
mouth. A projecting rostriform avicularium on the front below the aperture. Ocecia 
globose, prominent, surface brilliant, with a triangular mark in front. 
Habitat. — Station 1G3 a, off Twofold Bay, 150 fathoms, green mud (on Fucus ). 
Station 313, lat. 52° 20' S., long. 67° 39' TV, 55 fathoms, sand. 
[Tasmania, Mrs. Smith ; Australia, Macgillivray.] 
The ooecium, as it rises in front of the superjacent cell, raises with itself the avicularium, 
with which, consequently, it then appears to be surmounted. 
