ZONATDLID^. 
A small indeterminable fragment. Top bed of the Red Chalk, 
Hunstanton. Jesson ColL, Xo. 36. Identified and recorded by 
Vine as Zonopcra irregularis. 
A young zoarium, consisting of little more than a thick discoid base, 
with the surface well preserved. The apertures have slightly 
raised peristomes in the centre, and they are there separated by 
slight depressions ; they are crowded around the lower edge. 
Labelled “ Zonopora undata. Red Chalk. Hunstanton. G. R. 
Vine Coll., Xo. 7. It is indeterminable, but is probably the 
young stage of the same species as D. 2045. The surface gives no 
evidence that the zooccia are dimorphic. 
Indeterminable fragment of an elliptical stem ; walls of zooecia mouili- 
form near the aperture (probably the same species as D. 2665) . Red 
Chalk. Hunstanton. G. R. Vine Coll. 
An indeterminable fragment ; a thin section has been cut from it and 
shows that it is dimorphic. Labelled Zonopora undata. Red 
Chalk. Hunstanton. G. R. Vine Coll., Xo. 7. 
UNREPRESENTED SPECIES. 
1. cottaldina (d’Orbigny), 1854. 
Syn. Zonopora cottaldina, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 87. 
,, ,, d’Orbigny, 1853. Bry. Cret. p. 929, pi. 771, figs. 1-3. 
,, ,, de Loriol, 1868. Mon. Valaug. Arzier : Pal. Suisse, 
ser. 4, pt. ii. p. 64, pi. vi. fig. 3. 
Heteropora arborea, pars, Pergens, 1890. Rev. p. 373. 
Char. — Zoarium of thin cylindrical branches, 2mm. in diameter; the branches 
have regular verticils of apertures, separated by internodes covered by mesopores. 
Each aperture has a raised rim. 
Distrib. — Xeocomian: Fontenoy and Auxerre, Youne. 
Yalangian : Arzier, Yaud (Upper and Middle Beds of 
de Loriol). 
2. irregularis (d’Orbigny), 1854. 
Syn. Zonopora irregularis, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 87. 
,, ,, d’Orbigny, 1853. Bry. Cret. p. 930, pi. 771, figs. 4-6. 
non ,, ,, Vine, 1890. Polyz . Red Chalk : Quart. Journ. GeoL 
Soc. vol. xlvi. p. 482. 
non ,, ,, Vine, 1891. Microz. Red Chalk : Proc. 5Torks. GeoL 
Soc. vol. xi. p. 383. 
Heteropora arborea, pars, Pergens, 1890. Rev. p. 373. 
Char. — Zoarium flabellate, with anastomosing branches, which are long and thin. 
Apertures in wedge-shaped groups, placed alternately along the branches. These 
groups are separated by bands of mesopores. 
Distrib. — Xeocomian ’ ; Fontenoy and Auxerre, Yonne ; Yassy and Baudrecourt, 
Haute-Marne. 
* One specimen from the Red Chalk, referred to this species by Vine, is 
the small fragment recorded above as Zonatula favus, D. 2625. 
218 
D. 2625. 
D. 2663. 
B. 2664. 
B. 2665. 
