384 RErORT—1890. 
24. Reptomulticava mamilla, d’Orb. Ib. pl. 793, figs. 5-4. 
25, micropora, d’Orb. Ib. pl. 791, “ties. 10-12. 
26. Reptotubigera elevata, d’Orb. Ib. pl. 760, figs. 1- 8, 
27. marginata, d’Orb. Ib. pl. 750, figs. 19-21. 
28. Zonopora undata, d’Orb. Ib. pl. 771, fig. 14. 
The following additional Faringdon species are given from the 
‘Catalogue of Cretaceous Fossils in the Museum of Practical Geology.’ 
I have only regarded named species :— 
29. Actinopora elegans, Mich. (Lopholepis, Hag.), see d’Orb. Terr. 
Crét. p. 687. 
30. Alecto reticulata, d’Orb. Ib. p. 841. 
31. Proboscina ramosa, d’Orb. Ib. p. 851. 
32. - ramosa ?, Michelin (Diastopora ramosa?, Mich., see 
d’Orb. p. 851). 
33. " cornucopiz, d’Orb. Terr. Crét. p. 655. 
34, Diastopora congesta, Reuss = Iveptomultisparsa congesta, d’Orb. 
Ib. p. 878. 
35. 5 papyracea, d’Orb. = Berenicea papyracea, d’Orb. Ib. 
p. 868. 
36. Discocavea neocomiensis, d’Orb. Ib. p. 959. 
37. Ceriopora avellana, Mich. Ib. p. 1034. 
38. A cavernosa, Hag. Ib. p. 1034. 
39. " polymorpha, Goldf. ib. p. 1054. 
40, Heteropora clavula, Mich. Ib. p. 1070. 
41. Radioporia heteropora, d’Orb. Ib. p. 1035. 
42. Semimulticrescis ramosa, d’Orb. Ib. p. 1078. 
It will be evident from the above list that the Faringdon material is 
very rich as regards Polyzoa ; but how far the forms may be regarded as 
a true Lower Greensand fauna may now be tested. 
In his ‘ Prodromus of Paleontology,’ and also in the appendix to the 
‘Cretaceous Bryozoa,’ d’Orbigny has indicated by numbers (1 to 27),} 
the particular stages or horizons in the geological series of rocks in which 
Polyzoa had been found previously to his labours on the group. These 
studies form some of the most interesting considerations in his great 
work, for to a certain extent the Polyzoa, when carefully investigated, 
offer to the paleontologist many suggestions as to the probable age of the 
strata which come under his consideration. Every geological age has its 
peculiar group of Polyzoan forms, which may be utilised for the purpose of 
paleontology ; but in this direction our labours at present are far behind 
those of some at least of the Continental and American workers. I shall 
therefore apply d’Orbigny’s method in my endeavour to unravel the 
Polyzoan life-histories of the less-known Cretaceous faunas. 
Jurassic.—Stage 10. Basocian, d@’Orb. (Jurassic). See Paléont. 
Frang. vol. v.; Terr. Crét. p. 894. 
14.2 Entalophora Sarthacensis, d’Orb. (Clausa Sarthacensis, d’Orb.), 
Ib. p. 894. 
1 See Paléontologie Frangaise, tome v. p. 1082. 1850-52. 
2 The numbers in this column correspond with the numbers in the previous list ; 
so the student will be able to detect the differences between the old and the new 
names. The arrangement of the Cretaceous Polyzoa is in accordance with Dr. 
Pergens’ revision of d’Orbigny’s ‘ Bryozoaires.’ 
