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THE VOYAGE OF H.M.S. CHALLENGER. 
Leaving out of the question the tubular production of the peristome and the globose 
pisiform habit, &c., the differences in the chitinous elements alone are quite sufficient to 
show their specific distinctness. In Cellepora tubulosa the operculum is simply pyriform, 
exactly corresponding with the orifice, whilst in Cellepora hassallii it is suborbicular 
with a short peduncular projection below corresponding to the abrupt emargination of the 
lower border of the orifice ; and the avicularian mandibles in the former are acutely pointed 
or subacicular and in the latter semicircular, as in the great majority of Cellepores. 
Family XXXIII. Selenariada). 
Selenariadoe, Brit. Mus. Cat,, part I. p. 97. 
Selenaridea, Manzoni. 
Eschar idee (pars), d’Orb. 
Cellaricea (pars), Blainv. 
Membraniporidce and Microporidce (sp.), Smitt. 
Character. — Zoarium orbicular or irregular in outline, convex on one side, plane or 
concave on the other, in the mature state probably free, often with a foreign particle 
central or eccentric on the concave face. Zooecia immersed, flustrine. 
The Family here contains the following genera : — 
1. Cupularia, Lamouroux. 
(1) Cupularia guineensis, Busk (PL XIY. fig. 6). 
(2) Cupularia monotrema, n. sp. (PL XIY. fig. 5). 
(3) Cupularia owenii , Gray. 
2. Lunularia, Lamouroux ( nom . mut.) 
(1) Lunularia capulus, Busk (PL XIV. fig. 7). 
1. Cupularia, Lamouroux. 
Cupularia, Lamx., Brit. Mus. Cat., p. 97. 
Lunulites (pars), Defrance & Auctt. 
Fenestella (pars), Lonsdale. 
Character. — Each zooecium having a vibracularium at its apex. 
(1) Cupularia guineensis, Busk (Pl. XIV, fig. 6). 
Cupularia guineensis, Bk., Brit. Mus. Cat., I., p. 98, pl. cxiv. 
Character. — Zoarium orbicular, in section crescentic ; area rhomboidal, orifice ovoid, 
not extending to the summit ; lamina and raised border finely granular, edge of aperture 
entire. Vibracular opening auricular, with small elevation on one side. Under surface, 
with shallow radial sulci, ridges quite flat, divided into moveable quadrangular areas, 
each of which has four or five shallow pits. 
Habitat . — Station 186, lat. 10° 30' S., long. 142° 18' E., 8 fathoms, coral sand. 
[New Guinea ; Philippine Islands, Voy. of Rattles.] 
