Cyclostomatous Bryozoa from Madeira. 61 
stem is scarcely wider than the erect cells; it rarely divides 
dichotomously at the point where a cell arises, and it has not 
been seen to anastomose. The cells taper slightly upwards, 
are wrinkled transversely, and their mouths are circular. 
They are sometimes further apart, sometimes nearer each 
other, than the distance between them. Surface with white 
scattered granules. Ocecium not observed. 
This form seems to differ from A. granulata, H. M.-Edw., 
of which a figure is given in Mr. Busk’s Cat. Cyclost. Pol. 
B. M. pl. xxxii. fig. 1, where the adnate stem is represented 
as much thicker than the cells. 
Horneride. 
Hornera pectinata, Bk. 
This rare bryozoon was shortly described by Mr. Busk in 
the Mier. Journ. for Jan. 1861, vol. i. (n.s.) p. 79, pl. xxxiii. 
figs. 4—6, and again in his Cat. of the Cyclost. Polyzoa B. M. 
from a specimen sent by me to him many years ago. A 
few perfect specimens having since occurred, I am able 
to give a fuller account of the species and to describe the 
ocecium, not hitherto known. 
Colour greyish. Base spreading, trunk usually short and 
thick ; branches terete, strong, extending fan-like, sub- 
pinnately, or irregularly ; ultimate branches tapering. Ante- 
rior surface pierced by numerous oval pores, which are sunk 
in depressions and have slightly raised borders. Between 
the pores the surface is irregularly ridged. ‘The pores on the 
dorsal surface are larger and are partially filled up inside. 
The ridges are here more distinctly pronounced, and are 
sinuous, meeting and separating so as to form a reticulation. 
The peristome is minutely dentate. The ocecia are dorsal, 
brownish, semiglobular, and the surface is thickly set with 
warts, each of which has a depression at the top with a 
perforation therein. 
Three specimens were found on calcareous worm-cases 
attached to a Lithistid sponge (MacAndrewia or Corallistes). 
The largest specimen had a height of 21 millim, and a spread 
of 26 millim. 
Diastoporide. 
Diastopora catillus, J. Y. Johnson. 
Zoarium circular or elliptical, seated on a thin calcareous 
base; the margin vertical. Centre cupped, the younger 
deeply so, with scarcely any free area ; surtace finely granular, 
