REPOET ON THE POLYZOA. 
115 
This magnificent Retepora is at once distinguished by its gigantic proportions, which 
appear to be far greater than those of any other known species. 
(7) Retepora lata , n. sp. (PL XXVII. fig. 1). 
Character . — Zoarium expanded, folded, large and thick. Fenestrse very small, circular, 
distant, uniform. Dorsal surface granular, even, without apparent areolation. Zooecia 
anterior wall thick, sparsely punctured, granular ; in the older zooecia verrucose. Outline 
oval or rounded. Mouth orbicular, in the older portions deeply 
immersed, with a very short labial fissure, soon reduced to a minute 
pore. Peristome even, very rarely a minute oral spine on one or both 
sides, more usually none. Ooecia erect, prominent, lofty, immersed 
at the base, usually with a vertical fissure in front. Anterior 
avicularia very rare, small, seated on raised papillae ; mandible trian- 
gular, pointed. No dorsal or fenestral avicularia. 
Habitat. — Simon’s Bay, Cape of Good Hope. 
The striking character of this species is the comparatively minute 
size of the fenestrse in proportion to the width and thickness of the trabeculae ; and in 
accordance with this the number of zooecia in the breadth of the branch is very great. 
Its remarkable operculum should also be noticed. 
(8) Retepora crassa, n. sp. (PL XXVI. fig. 10 ; Pl. XXVII. fig. 3). 
Character . — Zoarium of large size (several inches), irregularly foliaceous, expanded, 
elongated, rising from a very thick cylindrical peduncle. F enestrse elongated, much narrower 
than the wide and thick trabeculae, about 0"’l long. Dorsal surface 
porcellanous, divided into small, irregularly hexagonal areolse, in the 
centre of most of which is a prominent papilla, usually supporting a 
minute avicularium with a semicircular mandible. Zooecia (young) 
urceolate, upper half prominent, free, but flattened in front. Orifice 
orbicular, sinuated. Peristome thin, raised, toothed, expanding, with 
two long slender unarticulated spines on each side (fig. 3b). 
Labial fissure median, short, wide, with an acute projecting angle on 
each side ; suboral pore small. Ooecia deeply immersed, often open, 
sometimes closed by a membranous lid, vertically fissured (Pl. XXVI. 
fig. 10). Anterior avicularia very sparse and only on the older zooecia, very small with a 
blunt gouge-shaped mandible, pointing directly downwards. 
Fig. 24. — Retepora, 
crassa. 
Fig. 23 . — Retepora 
lata. 
