vine: notes on bkitlsh eocene polyzoa. 
165 
1886. = Crisiasp. Alfred Bell. 
A small fragment of Crista, probably belonging to C. eburnea, is 
all that I have a note of, as indicating the existence of species of 
this gTonp in Eocene rocks. 
Horizon : London Clay. (Phillips) 
Cr/'sia ebiirnea, in fragments of course, have been found in Post 
Pliocene rocks, Montreal : British PalaBolithic : Scotch Glacial 
deposits : Austro-Hungarian Pliocene. I have also found fragments 
in Australian Yarra-Yarra material. 
18. Idmonea coronopus, Defrance i 
18o<l. Idmonea coronopus, Lonsd. Dixon's Geol. Sus. \). 158, 
pi. ix., f. 24. 
(Idmonea Atlautica ? Forbes), Busk, Hi neks. 
Zoarium dichotomously branched ; branches diverged excentri- 
cally, more or less rounded on the back ; transverse rows of tubular 
Zooecia, blended along the medial line, forming a crest ; erect, less in 
height than the depth of reverse portion of branch. 
Ho9'izo/i: Bracklesliam beds. Isle of Wight. 
The species described by Defrance is placed both by Busk '' and 
Hinckst as synonyms, though doubtfully, of Idmonea Atlantica, 
Forbes. 
The /. Atlanticoi the Post Pliocene beds of Garvel Park especially, 
is a most variable species, but whether it reaches back to the Eocene 
beds is rather doubtful ; still beyond this I must admit that the 
fragments in my possession help to favour the references of Busk and 
Hincks. I think it ^vise, however, for tlie present to leave it where 
Lonsdale placed it. 
15. Idmonea gracillima, ? Reuss. 
1869. Palaeont. Stud. Tertiar. d. Alpen., pi. xxxv., tigs. 1-2. 
There are fragments of /. gracillima, Reuss, amongst the 
" Bryozoenschichte von Moutecchio Maggoire," which closely resemble 
the species which I place here rather doubtfully. I cannot give many 
details of the British example, but while comparing specimens of the 
North Italian form I could not help noticing a resemblance, though 
* 1875. Pt. iii. Brit. Mus. Cata. Busk, p. 1 1. 
t 1880. Brit. Mar. Poly. Hincks, p. 4.-)l. 
