A. W. WATERS—REPORT ON THE BRYOZOA. 165 
of the oral aperture forms a large are, and the operculum becomes wider at 
the proximal edge ; on the lower lip to one side there is a small raised 
avicularium directed laterally and a peristomial fissure ; however, many of 
the zocecia have the lower lip entire, without any avicularia, but only a 
ridge, as in H. Descostils, Aud. Only a very few vicarious avicularia have 
been met with, and these have a large nearly semicircular mandible (fig. 5) 
without columella. 
There are columnar processes, usually at right angles to the base of the 
zoarium, or arising at the side of the zocecium, and they pass up from 
a lower layer of zocecia, though not through a large number of layers as in 
AM. columnaris, Busk, nor are they as large. 
The oral glands are long and contorted in various directions like a 
wriggling worm (fig. 7), and on this account the name vermiformis is given. 
The walls of these glands are rather thin, in most cases like the walls of the 
tentacular sheath, and are without any of the large cells found in the glands 
of Schizoporella, Snuttia, &c., so that there is no appearance of secreting-cells. 
The contents of the tube are the yellowish material that we have seen 
elsewhere. 
This is much like the H. pertusa, Smitt, but he gives the aperture as 
0-31 mm. wide, whereas in the present species it is only about half that width. 
However, in the small pieces from the Red Sea given to me by Professor 
Keller, there was, besides H. piymentaria, noy., a form with large zocecia 
and large apertures, which seems to be the HH. (Cellepora) pertusa of Smitt, 
although even here the operculum does not come up to the size given by 
Smitt, not being more than 0°26 mm. wide. There are very large semi- 
circular avicularia directed inwards over the oral aperture (fig. 18), and also 
avicularia of various sizes, the mandibles of which have a well-marked 
columella (Pl. 16. figs. 17-21). 
Loc. From ship ‘ Fayoum’ in Suez docks, 8 months (20). 
BERLIN COLLECTION. 
CANDA ARACHNOIDES, Lamourow.. 
In the specimens examined from the Red Sea only two anterior avicularia 
were found, except those on the ovicells; but I * have already mentioned that 
in some Australian pieces no avicularia are found, whereas they are common 
in others. In its zoarial growth it so much resembles C. retiformis, Smitt, 
that we cannot always be sure which of the two some of the older authors 
had before them, though the characteristic seutum enables C. retiformis to be 
* Ann. Mag. Nat. Hisé. ser. 5, vol. xx. p. 89. 
