138 
CERIOPOEID^. 
? Geriopora micropora, Fric, 1869. Pal. Stud, botini. Kr. : Arch, naturw. 
Laudesf. Bohm. vol. i. pt. ii. p. 222. 
,, ,, Simonowitsch, 1871. Bry. Ess. Griins. : Verb. nat. Ver. 
preuss. Rheinl. vol. xxviii. p. 50. 
,, ,, von Reuss, 1872. Op. cit. p. 127, pi. xxxi. figs. 6, 7. 
,, phymatodes, von Reuss, 1872. Ibid. p. 128, pi. xxxi. figs. 10, 11. 
Diagnosis. 
Zoarium nodular; it begins as an irregular spheroid, from 
7 or 8 mm. in diameter, with a smooth surface; but it 
grows to 25 mm. in diameter, and the surface is raised in 
blunt processes, which may render the zoarium botryoidal. 
Apertures crowded, and often subangular and minute. 
Disteibijtion. 
British : 
PAlbian — Zone of Schloenbachia rostrata: Haldon Hills, near Exeter. 
Foreign : 
Cenomanian : Le Mans. 
Unter Quader: Plauen, Saxony. 
Korycaner Schicliten : Scliillinge, near Bilin ; Korycany, 
Bohemia. 
Affinities. 
This species is a member of the fungiformis-micropora series. 
It differs from It. fmgiformis by the absence of the ringed stalk. 
Yon Eeuss refers to the lamellar structure of this species. 
Von Eeuss, in 1872, figured and described two specimens from 
Plauen as Ceriopora avellana ; he refers to their having much smaller 
pores than C. micropora^ and says the pores are not visible to the 
naked eye. At the same time he figured two globular specimens, 
8 to 9 mm. in diameter, as C. micropora\ they do not, however, 
belong to that species, but apparently to his C. avellana. So far 
as von Eeuss’s figures allow an estimate of their size, the 
apertures seem to have the average diameter ^ of those in the 
latter species. 
The inclusion of C. phymatodes in this species seems inevitable, 
in spite of the fact that, at first sight, the apertures in C . phymatodes 
appear larger ; certainly, if von Eeuss were right in his identification 
of the specimens which he figured as C. avellana^ his C . phymatodes 
should be merged in that species. Michelin’s type- specimen of 
C. avellana is a small, smooth, spheroidal mass, like von Eeuss’s 
specimens of C. micropora. Von Eeuss referred to C. avellana some 
