REPORT ON THE POLYZOA. 
65 
Var. c. erecta. 
Habitat. — Station 320, lat. 37° 17' S., long. 53° 52' W., 600 fathoms, green sand. 
(On a species of Salicornaria.) 
2. Amphiblestrum, Gray. 
Membranipora (pars), Auctt. (type, Membranipora flemingii). 
Character. — A partial internal calcareous lamina. Aperture often more or less 
trifoliate, or obovate. 
(1) Amphiblestrum imbricatum , n. sp. (PL XY. fig. 3). 
Character. — Zoarium incrusting, very closely adnate (on an Eschar a). Zooecia, 
outline arched above, contracted inferiorly. Border thick and tumid, so that the area is 
very small and almost entirely occupied by a very thick lamina, from the lower part of 
which springs a strong, calcareous, hatchet-shaped process, on one edge of which is an 
avicuiarium, with a slender acute mandible pointing upwards. Ooecia inapparent. 
Habitat. — Simon’s Bay, Cape of Good Hope. 
The zooecia are disposed very regularly in quincuncial order, and imbricated like fishes’ 
scales or rounded tiles. But the great peculiarity is the curious avicularian process in 
front of the zooecia, which is thus almost wholly concealed. N.B. — In the figure the 
border of the front is shown much too thin. 
(2) Amphiblestrum cristatum, n. sp. (PI. XV. fig. 1). 
Character. — Zoarium of a dark brown colour, thick. Zooecia in the older portions quite 
immersed. Area pyriform, much expanded above and contracted below. Margin much 
raised, acute, smooth. Orifice suborbicular, occupying the upper half of the area ; 
lamina obscurely granular. Two very stout articulated spines close together on each 
side above. On the sterile zooecia a small, usually aborted avicuiarium at the summit. 
Ooecia large, galeriform, with a strongly marked visor-like crescentic space in front, and 
at the summit a large avicuiarium, sometimes sessile, sometimes elevated on a long 
trumpet-shaped peduncle ; mandible obtusely lanceolate, pointing directly forwards. 
Occasionally a long trumpet-shaped pedunculate avicuiarium springs from the front of 
the zooecium below the aperture. 
Habitat. — Station 149d, Royal Sound, Kerguelen Island, 28 fathoms, volcanic mud. 
This is one of the most remarkable forms among the Challenger Membraniporidse. 
The resemblance of the zooecium, with its crest and visor-like conformation in front to a 
(ZOOL. CHALL. EXP. — PART XXX. 1884.) Gg 9 
