384 VINE : POLYZOA AND MICROZOA OF YORKSHIRE AND NORFOLK. 
1890. Zonopora irregularis (?) Vine, Quart. Journ. Geol. Soc, vol. 
xlvi., p. 482. 
Habitat : Embedded in Red Chalk. 
Horizon : Top la3^er (A.) Hunstanton. 
40. Zonopora variabilis (?), d'Orb. 
1852. Zonopora variabilis, d'Orb., Terr. Cret., v., p. 931, pi. 771, 
figs. 9-13. 
1890. Heteropora variabilis, Perg., Rev. des. Bryoz., p. 374. 
1890. Zonopora variabilis (?), Vine, Quart. Journ. Geol. Soc, 
vol. xlvi., p. 482. 
Two minute fragments are placed here doubtfully. 
Horizon: Top layer (A.) Red Chalk, Hunstanton. 
41. Multicrescis variabilis, d'Orb., Terr. Cret. v., p. 1077, pi. 800, 
figs. 3-7. 
1890. Multicrescis variabilis, Vine, Quart. Journ. Geol Soc, vol. 
xlvi., p. 483. 
Horizon: Top layer (A) Red Chalk, Hunstanton. 
42. Heteropora tenera. Hagenow, var. 
1890. Heteropora (?) sp.. Vine, Quart. Journ. Geol. Soc, vol. xlvi., 
p. 480. 
I am rather doubtful about this species, as the fragments were 
very soft and did not yield good results when rubbed down for 
minute examination. Yet I have had fragments of Faringdon 
//. tenera just as doubtful to deal with, but being of a harder texture 
better results were obtained by rubbing. 
Habitat : Decumbent on Water-worn Hunstanton Red Chalk. 
43. Lichenopora collis, d'Orb. 
1850. Actinopora collis, d'Orb., Terr. Cret. v., pi. 643, fig. 1-4. 
1852. Unicavea coUis, d'Orb., Ibid. p. 973, pi. 778, fig. 1-2. 
1890. Unicavea collis, Vine, Quar. Journ. Geol. Soc, vol. xlvi., 
p. 483. 
This species must not be confounded with Reptomiilticavea 
collis, d'Orb., already described. 
Habitat : On Terebratula, Inoceramus, and Bourgueticrinus. 
I have found two varieties of this species among my Red Chalk 
material. 
