160 
CEEIOPOEID^. 
Petersberg near Maastricht, the marl of Essen on the Euhr, and 
the npper chalk of “ Cleom bei Xantu.” He does not say from 
which locality his figured specimens came. He gave four figures, 
Or-d^ and he draws dotted lines uniting respectively I with e 
and a with d, thus suggesting that figure is a magnified view 
of part of the surface of the specimen shown in figure a, and the 
specimen appears to be from Maastricht. He Blainville, in 1830,* 
interpreted the figures in this way, as he took the two figures 
a and d as C. micropora. The figures h and c are views of the 
same specimen, as that fact is expressly stated by Goldfuss {op. cit. 
p. 33) ; it is, however, not a Bryozoon, and is probably a Ceno- 
manian sponge from Essen. 
It appears, however, from the study of Goldfuss’s type-specimens 
by von Hagenow that the figures a and d are not of the same 
specimen, but of specimens of different genera. C. micropora., 
Goldf., therefore includes three distinct fossils. According to 
von Hagenow the figures in Goldfuss, pi. x. fig. 4, must be 
classified as follows: — 
Goldfuss, pi. X. fig. 4a, is a Heteropora, and refigured by 
von Hagenow as the type of S. crassa, Hag. : Bry. maastr. 
Kr. pp. 46, 52, pi. v. fig. 13. 
Do. figs. 45, e, fide von Hagenow (p. 52), represent a sponge 
of the genus Achilleum. 
Do. fig. 4(? is left as the type of C. micropora, and has been 
refigured as such by von Hagenow, op. cit. p. 52, pi. v. fig. 4. 
Yon Hagenow admitted an element of doubt in reference to 
fig. 4^?; but he believed that Goldfuss’s figure, pi. x. fig. A.d, 
represented a magnified part of the globular specimen, which 
von Hagenow figured as the type of micropora in his pi. v. fig. 4. 
Under the circumstances it seems to me clear that we have 
to follow von Hagenow in his selection of the specimen shown 
in his pi. V. fig. 4 as the type of Ceriopora micropora. 
The forms included here by Simonowitsch and von Beuss are 
transferred to Reptomulticava avellana (Mich.). Yon Eeuss 
unfortunately does not give dimensions, and the magnification of 
his figures is not given. The fossils are described as having very 
small, crowded apertures and as being composed of concentrically 
De Blainville. Zoopk. : Diet. Sci. nat. vol. lx. p. 378. 
