12 Rev. T. Hincks’s Contributions towards 
Family Porinide. 
Porta, D’Orbigny. 
Porina (Eschara) gracilis, Lamouroux. 
(Pl. III. fig. 5.) 
Zoarium erect, irregularly branched, somewhat compressed. 
Zoecia elongate, confluent, quincuncially disposed, the wall 
rising towards the orifice ; surface reticulato-punctate ; orifice, 
in young cells, arched above, the lower margin slightly curved 
inward; in adult cells suborbicular, moderately raised, the 
peristome thickened and bearing several (sometimes as many 
as six) round avicularia; at a very short distance below the 
orifice an elongate pore (which frequently becomes round as 
calcification proceeds). Small circular avicularia often dis- 
tributed irregularly over the cells. Occtwm immersed. 
Loc. Curtis Island, not uncommon. 
Busk does not notice the oral avicularia; the two mamil- 
lary projections mentioned by him are avicularian. MacGil- 
livray describes the pore as round; it is primarily elongate. 
Family Myriozoide (part.), Smitt. 
ScHIZOPORELLA, Hincks. 
Schizoporella biaperta, Michelin (?=Lepralia megasoma, 
MacGillivray). 
This species occurs in two conditions, incrusting and with 
an erect branching zoarium, often of very considerable size, 
the branches cylindrical. I can find no characters in the cell 
of the latter to distinguish it from that of the more usual 
crustaceous form. Mr. Waters records an Hischarine variety 
from the Sicilian Pliocene, which is erect and foliaceous; so 
that this widely distributed form exhibits the most striking 
differences in its habit of growth. 
Schizoporella triangula, n. sp. 
(PI. II. figs. 4, 4a.) 
Zoecia subquadrangular, depressed, arranged in linear 
series, bordered by a raised line; surface reticulato-punctate, 
or thickly covered with nodules ; orifice subtriangular, margin 
not raised, a sinus below marked off by two lateral dentate 
processes; immediately below the orifice an elongate avicu- 
lartwm, with pointed mandible directed straight downwards, 
either immersed or with the beak standing out prominently. 
