EEPOET ON THE POLYZOA. 
149 
one immediately above each zooecium. Surface very rough and uneven. Primary mouth 
orbicular, entire ; afterwards, by the elevation of the peristome, is formed a deep, 
infundibuliform cup, at the bottom of which the small primary orifice is visible ; peri- 
stome thick, entire. Ooecia inapparent. 
Habitat . — Off Honoruru, Sandwich Islands, 20 to 40 fathoms (inside a dead shell). 
[There is only a single small worn specimen in the collection. I place the species with 
Chorizoporcc simply on account of the distant zocecia, but its family position is quite 
uncertain, though it would appear to come within d’Orbigny’s definition of Mollia.~\ 
4. Porella, Gray. 
Porella, Hincks, Smitt (pars), Gray, Brit. Mar. Ead., pp. 127, 128. 
Cellepora (pars), Fleming. 
Eschara (pars), Sars, Bk., Alder, Smitt, &c. 
Hemeschara (pars), Norman. 
Lepralia (pars), Bk., &c. 
Character. — Zoarium erect ramose, cylindrical or subcompressed ; or crustaceous and 
adnate. A median oral avicularium within the primary mouth, with a semiorbicular or 
subtriangular mandible. 
[The peculiar framework of the mandible, in the genus Porella, is shown at a, wood- 
cut 44, p. 147.] 
(1) Porella Icevis, var. svhcompressa, Hincks (PI. XX. fig. 3). 
Character . — Zoarium with the general habit of Porella Icevis, with the branches 
subcompressed and bilaminar. 
Habitat. — Porto Praya, St. Iago, Cape de Verde, 100 to 150 fathoms. 
[The difference between this and the usual cylindrical form of the northern Porella 
Icevis is sufficient to mark it as a distinct variety. In the chitinous parts there is no 
difference except that the avicularian mandible is on the whole larger, and usually 
exhibits a median tooth on the inside at the top. But it has the same elevated arched 
form and not the depressed semicircular shape of the mandible in Porella compressa. J 
5. Escharoides, Smitt. 
Eschara (pars), Auctt. 
Escharoides , Smitt, Hincks. ? Milne-Edw. (pars). 
Character. — Secondary orifice sinuated below, with an avicularium on one or both 
sides of the notch. 
