64 Professor J. W. Gregory — New Cretaceous Bryozoa. 



to the formation of depressions. Surface, Avhen Tvell preserved, covered in places by 

 a thin calcareous epizoarium, which closes most of the apertures. Zooecia of above 

 average size ; from twelve to twenty apertures per sq. mm. "Walls thick and distinctly 

 moniliform in longitudinal section. Diameter of zooecia about "2 mm. 



Distribution. — Lower Greensand : rarringdon, Berks. 



Heteropora, de Blainville, 1830. 

 Seteropora keeping i, n.sp. 

 Synonymy. 



Heteropora {Multid-eecis) micheUni, Keeping, 1883. Foss. Neoc. Upware, p. 141. 

 non Ceriopora michelini, d'Orbigny, 1850. Prod. Pal., vol. ii, p. 143. 

 Diagnosis. — Zoarium tufted, rising from a thick base, giving off above thick, 

 finger-shaped, simple branches, or knobby branches, which may divide irregularly ; 

 branches end bluntly. Mesopores uniserial, or sometimes biserial. 



Distrihution. — England — Lower Greensand : Brickhill, Upware ? 

 {fide Keeping) ; Coxwell and Farringdon, Berkshire ; ? Isle of Wight. 

 Foreign — Albian : Grandpre, Ardennes. 



Seteropora clavata, Kade, 1852.^ 

 . Synonymy. — 'Heteropora clavata, Kade, 1852. Los. Yerst. Schanzenb., p. 32. 



I)iag)iosis. — Zoarium clavate, of a short stem which expands regularly upward 

 into a pear-shaped mass. Transverse section irregularly elliptical, flattened on the 

 side. Most of the surface is smooth, but the type-specimen is irregularly pitted. 

 Zooecia large, irregularly scattered. Mesopores large, a circle of five to seven 

 around each aperture ; and the circles of mesopores are confluent, so that but one 

 mesopore or line of mesopores occurs between adjacent zooecia. 



Distrihution. — England — Lower Greensand : Farringdon (Work- 

 house Pit), Berkshire. Foreign — Remanie in Drift : Schanzenberg, 

 near Meseritz. 



Heteropora subaiquiporosa,'^ n.sp. 



Diagnosis. — Zoarium funnel-shaped, composed of a thick layer around a hollow 

 axis. Surface pustular, with irregular, indefinite tubercles or knobs. Mesopores 

 large ; in single lines between the apertures, but not well marked off from the 

 zooecia. 



Distrtiutio7i. — Tipper Greensand : Warminster. 



ZojTATULA, Hanim, 1881. 



Zonatula brydotiei, n.sp. 



Diagnosis. — Zoarium club-shaped, with a short, narrow stem and an egg-shaped 

 head. The apertures of the zooecia are circular or subcircular. They are divided 

 into groups by alternate horizontal lamintie, which extend half-way across the 

 apertures into alternate groups. 



Distribution. — Lower Greensand : Farringdon, Berkshire. 



DiscocATEA, d'Orbigny, 1853. 

 DisGocavea reussi, n.sp. 



Synonymy. — Hetcroporella collis (non d'Orb.), von Reuss, 1872. Bry. unt. 



Quad. Elbthalg. : Palseontogr., vol. xx, pt. i, p. 133, pi. xxxiii, fig. 6. 

 Diagnosis. — Zoarium small, circular, convex, with a small central depression, on 

 the floor of which are about fifteen apertures. Radial series of apertui'es nimierous 



^ Kade's name is practically a list name, and the description is therefore included 

 in this paper. 



2 Named from the comparatively slight difference in size between the zooecia and 

 mesopores. 



