204 
HETEKOPORID^. 
M. varialilis may be chosen, as it is better to use one of the species 
which d’Orbigny figured, and of them M. variahilis is probably 
the commonest and is best illustrated by d’Orbigny’s figures. 
The genus is represented in the Jurassic by M, lammata (Greg.), 
which I formerly included in Seteropora, as in 1896, when 
cataloguing the Jurassic Bryozoa, I thought the formation of the 
zoarium by successive layers of zooecia, though a satisfactory 
character among the Tubulata, was not of generic value in such 
Bryozoa as Heteropora. I am, however, now disposed to acknow- 
ledge the value of this character, and therefore accept d’Orbigny’s 
genus. 
1. Multicrescis variabilis, d’Orbigny, 1854. 
Synonymy. 
Multicrescis variabilis, d’Orbigny, 1854:. Bry. Cret. p. 1077, pi. 800, figs. 3-7. 
^non ,, ,, Vine, 1891. Rep. Cret. Polyz. : Rep. Brit. Assoc. 1890, 
p. 383. 
? no7'i , , 
non ,, 
Heteropora 
? 
,, Vine, 1892. Addit. Cret. : Proc. Yorks. Geol. Soc. 
voL xii. p. 161, pi. yi. figs. 13, 14. 
,, Gamble, 1896. Cat. Bry. Chatham, p. 4. 
,, Novak, 1877. Bry. bohm. Kr. : Denk. Ak. Wiss. 'NVien, 
vol. xxxvii. pt. ii. p. 116, pi. ix. figs. 10-20. 
,, Pergens, 1888. Age Tuf. Ciply: Bull. Soc. beige Geol. 
vol. i. p. 205. 
[Multicrescis) variabilis, Pergens, 1890. Rev. p. 373. 
variabilis, Pocta, 1892. Mech. Koryc. Hory : Ceska Ak. Fr. Jos. 
Praze, sect. ii. p. 25. 
,, Tine, 1893. Compl. Rep.: Rep. Brit. Assoc. 1892, 
p. 332. 
Ceriopora ,, Morgan, 1882. Terr. cret. Scand. : Mem. Soc. geol. 
France, ser. 3, vol. ii. No. 2, p. 15. 
Diagnosis. 
Zoarium short, clavate ; a short ringed stalk, expanding above, 
where it is domed or slightly lobed, or cut into short blunt 
branches. 
Mesopores scarce, about as numerous as the zooecia. 
The apertures of the zooecia are surrounded by a slight rim. 
Dimensions. 
D’ Orbigny’s 
B.M. D. 317 
tj'pe. 
? Haldoa. 
mm. 
mm. 
Height of zoarium . . 
9 
22 
Diameter of zoarium 
7 
23x18 
Diameter of stalk 
3 
8 
