REPORT ON THE POLYZOA. • 
67 
(6) Amphiblestrum cajoense, n. sp. (PL XXIII. fig. 3). 
Character. — Zoarium erect, composed of short, usually furcate, spreading, cylindrical, 
or subcompressed branches. Zocecia disposed more or less 
quincuncially, or in subalternate longitudinal rows on all 
sides. Frontal areas as wide as long, arched above, slightly 
contracted below. Border very thick, continuous with 
the partial lamina below. Aperture obovate or circular, 
entirely occupied by the operculum, which is obovate, 
with the occlusor muscles attached about the middle on 
each side (fig. 1). 
Habitat. — Simon’s Bay, Cape of Good Hope. 
A small upward spine is articulated on each side above, 
beyond the border (often wanting or readily detached). The species is very doubtfully 
placed with Amphiblestrum. 
3. Bijlustra, d’Orbigny. 
Biflustra, d’Orb., Rech. sur. les Moll. Bryoz. Ann. d. Sci. Nat., ser. 3, t. xviii. p. 330; Pakeont. 
Prang., p. 241; Bk., Crag Polyz., p. 71; Manzoni, Stoliczka, Macgilliv. (sp.), Smitt (pars). 
Flustrellaria (pars), d’Orb. 
Character. — Zoarium dimorphous, encrusting or decurrent and unilaminar, or foliaceous, 
erect and bilaminar, readily fissile in all directions. Zocecia in alternate series, 
longitudinal or transverse. 1 Zocecia flustrine, quadrangular or hexagonal (?), with a 
denticulate lamina at bottom. 
Bijlustra savartii , Auclouin (sp.) (PL XIV. fig. 2). 
Flustra savartii, Audouin, Egypte, pi. x. fig. 10. 
Membranijpora savartii, d’Orb., Palseont. Prang., p. 542; Bk., Crag Polyz., p. 31, pi. ii. fig. 6. 
„ corrugata , Blainv., Diet. d. Sci. Nat., vol. lx. p. 412. 
Biflustra savartii, Smitt, Florid. Bryoz., part ii. p. 20, pi. iv. figs. 92-95. 
Character. — Zoarium dimorphous, at first decurrent, afterwards rising into a bilaminar 
expansion. Zocecial area arched above, with straight sides, and slightly contracted 
below. Border thick, granular. Aperture oval, lamina finely granular. 
Habitat. — Samboangan, Philippine Islands, 10 fathoms. 
There may be some doubt whether this is really the Flustra savartii of Savigny and 
of the Crag, but it is very like it, and almost certainly identical with Prof. Smitt’s species. 
With respect to the true limits of Bijlustra, regarded as a generic group distinct from 
Membranipora, opinions may very fairly differ widely. 
1 As in Biflustra clathrata, Reuss, which may, however, belong to Mulicerita. 
