152 VINE: FOSSIL POLYZOA : ADDITIONS TO THE CRETACEOUS LISTS. 
Ceriopora micropora, Goldf. (Quart. Journ. Geol. Soc, p. 480; 
Yorksh. Geol. Soc, 382). 
Multicrescis variabilis, d'Orb. (Quart. Journ. Geol. Soc, p. 482 ; 
Yorksh. Geol. Soc, p. 384). 
This last species was well represented by several free examples, 
some of which closely resemble the Thalamopora Michelini from the 
Essen Greensand, described by Simonowitsch (Beitrage zur Kenntwiss 
der Bryoz. des Essener Griinsandes, 1872). See pi. VI., figs. 13-14. 
V. Zonopora undata ? d'Orb. (or variety of the same), pi. VI., figs. 
8 and 9. 
D'Orb. sp. Terr. Cret. p. 932, pi. 771, figs. 14-15. 
The Zoarium of this species is disposed in cheese-like zones, but 
rather more compressed than in d'Orbigny's figure. Zonopora 
undata is a Senonian fossil with well-marked characters, and this, 
in common with all those species which have true zooecial apertures 
separated by smaller pores (" les cavites intersque lettiques,") Dr. 
Pergens relegates to the Heteropora group. I have given the nearest 
affinity possible for this rather rare British Polyzoon. and in placing 
it as a variety, any misconception as to its zonal position will be 
avoided. 
Horizon : Top Beds Red Chalk, Hunstanton. 
VI. Reptomulticava collis. d'Orb. PI. VI. , figs. 10-12. 
See Quart. Journ. Geol. Soc, 1890, p. 481. 
See Proc. Yorksh. Geol. Soc 1890, p. 382. 
D'Orbigny Terr. Cret., p. 1036, pi. 792, figs. 1-3. 
The examples illustrated on pi. VI are finer and much better 
preserved than those referred to in the two papers indicated above, 
and are also larger than d'Orbigny's figure. The largest example 
(fig. 11, pi. VI.) is fully a quarter of an inch in diameter without the 
extended basal lamina, which generally projects beyond the raised 
portion of the Zoarium. Figs. 10 and 12 represent examples from 
the top bed of the Red Chalk, and as regards height are slightly 
different from fig. 11 ; otherwise they were about the same dimen- 
sions at the base. 
