EEPOET ON THE POLYZOA. 
79 
close to the summit. At the bottom of the aperture a large upright hollow process with 
a circular opening surrounded by a very thick granular border and having on one side a 
laro-e avicularium with an acute falciform mandible, and furnished round the base with 
several irregularly furcate chitinous processes. Each zooecium crowned with an avicu- 
larium with an acute triangular mandible pointing upwards. Ocecia galeate, each crested 
with an avicularium on a short cylindrical peduncle ; and having a radiate pore in front, 
immediately above the opening. 
Habitat . — Prince Edward Island, 80 to 150 fathoms. 
From the densely crowded way in which the cells are disposed, and the manner in 
which they are concealed by the spines and curious frontal avicularian processes, I have 
not been able to give an accurate figure of them in situ, but those given may perhaps 
suffice to render the description more intelligible. This is one of the most remarkable 
forms among the Polyzoa. 
Group C. ESCHAEINA. 
Family XIII. Bifaxartada;. 
Character. — Zoarium rigid, continuous or articulated, biserial, variously branched. 
Zocecia alternate, closely connate back to back and facing in opposite directions. 
The Family here contains the following genera : — 
1. Bifaxaria, n. gen. 
§ a. articulates. 
(1) Bifaxaria submucronata, n. sp.(Pl. XIII. fig. 1). 
(2) Bifaxaria Icevis, n. sp. (PI. XIII. fig. 2). 
§ /3. inarticulatce. 
(3) Bifaxaria corrugata , n. sp. (PI. XIII. fig. 3, and PI. XXIY. fig. 6). 
(4) Bifaxaria papillata, n. sp. (PL XIII. fig. 4, and PI. XXIY. fig. 4). 
(5) Bifaxaria minuta, n. sp. (PI. XIII. fig. 5). 
(6) Bifaxaria. \ reticulata, n. sp. (PI. XIII. figs. 6 and 8). 
(7) Bifaxaria cibyssicola, n. sp. (PI. XXIY. fig. 5). 
(8) Bifaxaria denticulata, n. sp. (PI. XXIY. fig. 3). 
2. Ccdymmophora. 
Calymmophora lucida, n. sp. (PI. XXXII. fig. 3). 
1. Bifaxaria, n. gen. 
Character. — Zoarium continuous or segmented, variously branched, rooted by 
radical tubes. Zocecia biserial, alternate, facing bifariously on the two sides, very closely 
