C yclostomatous Bryozoa from }faflcira. fil 



stem is scarcely wider than the erect cells ; it rarely divides 

 dichotomously at the point where a cell arise?, and it has not 

 been seen to anastomose. The cells taj)er 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. Ooccium not observed. 



This form seems to differ from A. (jranulata^ H. M.-Edw., 

 of which a figure is given in Mr. Busk's Cat. Cyclost. Pol. 

 B. M. pi. xxxii. fig. 1, where the aduate stem is represented 

 as much thicker than the cells. 



Horneridae. 

 Hornera pectinata^ Bk. 



This rare bryozoon was shortly described by ^l\\ Busk in 

 the i\lier. Journ. for Jan. 18G1, vol. i. (n. s.) p. 79, pi. 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 ooecia 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 CoralUstes) . 

 The largest specimen had a height of 21 millim. and a spread 

 of 26 millim. 



Diastoporidse. 

 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 ; surface finely granular. 



