HETEROPOEA. 
198 
Figures. 
Fig. 5\a, p. 192. The zoarium from the side; X 2 dia. Fig. 51b, 
part of the surface; X 10 dia. Lower Greensand: Farringdon. 
Caleb Evans Coll. D. 7294. 
Afeinities. 
This species was founded by Kade on a drift specimen, of which 
the horizon is unknown, but is probably Lower Cretaceous. His 
description is inadequate. He states that it “resembles the form 
of Ceriopora clavata, Goldf., through its club-shaped expansion, 
but the larger pores are regularly surrounded by the smaller.” 
These characters, so far as they go, agree with those of a specimen 
from Farringdon, illustrated by Figs. 5\a, h. A transverse section 
across this specimen shows that it has a massive centre composed 
of long zooecia which reach to the surface of the zoarium ; 
the structure is not multilamellar, and the species is therefore 
a Heieropora and not a Multicrescis. 
Kade’s name might well be ignored as a nomen nudum, and 
the Farringdon specimen may be accepted as the type of Seteropora 
clavata. 
D. 7294. A zoarium with a narrow base; it is 18mm. in diameter at the 
top, and the stalk is 7 mm. in diameter. Lower Greensand. 
AVorkhouse Pit, Farringdon. Caleb Evans Coll. Purchased of 
E. Westlake, 1887. Figs. o\a, b, p. 192. 
4. Heteropora michelini (d’Orbigny), 1850. 
Synonymy. , 
Heteropora cryptopora {non Goldf.), Michelin, 1841. Icon. Zooph. p. 3, pi. i. 
fig. 2. 
Ceriopora michelini, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 143. 
non Multicrescis michelini, d’Orbigny, 1854. Bry. Cret. p. 1075, pi. 799, 
figs. 14, 15. 
,, Heteropora [Multicrescis) michelini. Keeping, 1883. Foss. Neoc. Upware, 
p. 141. 
,, ,, ,, ' ,, fars, Pergens, 1890. Eev. p. 373. 
,, coalescens, von Reuss, 1872. Bry. unt. Quad. : Palaeontogr. 
vol. XX. pt. i. p. 131, pi. xxxii. figs. 10-12. 
? ,, ,, Keeping, 1883. Foss. Keoc. Upware, p. 141. 
Diagnosis. 
Zoarium often somewhat flabellate, consisting in the var. 
coalescens'^ of numerous cylindrical and compressed anastomosing 
^ The varietal names lobata and cylindrica are new ; coalescens is adopted from 
a specific name of von Reuss. 
o 
