684 A. W. WATERS ON FOSSIL CYCLOSTOMATOUS 
3. Ipmonea Minneana, d’Orb. 
Idmonea Milneana, @Orb. Voy. dans PAmér. Mérid. vol. v. p. 20, 
pl. ix. figs. 17-21 ; Smitt(?), Floridan Bryozoa, p. 8, pl. iil. figs. ]4— 
16; Busk, Cat. Mar. Polyz. pt. 11. p. 12, pl. xi; Haswell, on Cyclost. 
Polyz. Port Jackson, Proce. Linn. Soc. N. 8. Wales, vol. iv. p. 351; 
MacGillivray, Zool. of Victoria, decade vil. p. 29, pl. lxvii. fig. 1; 
Busk, Note on Foss. Polyz. near Mt. Gambier, Q. J. G. 8. vol. xvi. 
p. 261; Ridley, Zool. Coll. of ‘ Alert,’ Proc. Zool. Soc. 1881, p. 56. 
Idmonea Giebeli, Stoliczka, Olig. Bry. von Latdorf. p. 81, pl. 1. 
fig. 6. 
Idmonea Giebeliana, Stol. Foss. Bry. Orakei Bay, p. 115, pl. xviii. 
figs. 4, 6. 
Idmonea notomale, Busk, Cat. Mar. Polyz. pt. iii. p. 12, pl. xi. a. 
The specimens from Curdies Creek show the minute pores on the 
front and dorsal surface to be quite similar in size and frequency. 
Although this is widely distributed, the ovicell is, as yet, only 
known in the Capri specimen, in which it occurs very little raised, 
mostly in the centre of the zoarium, embracing the zocecia. Zoarium 
0:8-1°5 millim. wide, width of zocecial tube about 0°15 millim. The 
thickness of the margin of the tube must, to a large extent, depend 
upon the locality of growth. In a specimen from Mt. Gambier, in 
the collection of Mr. Etheridge, jun., there is a spine on the dorsal 
surface, as described by Mr. Ridley. 
Loc. Living: Les Malouines (d’Orb.), Terra del Fuego; Pata- 
gonia, 30 fathm.; Chonos Archipelago? (B.); Florida? (Sm.) ; 
Sydney (Hasw.); Port Phillip Heads, Victoria, 10-15 fathm. 
(MacG.); Tom Bay, 8.W. Chih, 0-30 fathm. (Ridley); Capri. Fos- 
sil: Oligocene, Latdorf; Orakei Bay (Stol.), Mt. Gambier, Curdies 
Creek, Bairnsdale. 
4, Ipmonza RADIANS, Lamk. 
Retepora radians, Lamk. Anim. sans vert. ii. p. 183. 
Idmonea radians, Stoliczka, Foss. Bry. d. Orakei Bay, p. 116, 
pl. xvii. figs. 9-10. 
I thus name, with some doubt, a few delicate specimens from 
Mt. Gambier, about 0-3 millim. wide, and with the series 0-40°5 
millim. apart. 
5. Ipmongea Hocustertertana, Stol. Pl. XXX. figs. 12, 13. 
Crisina Hochstetteriana, Stoliczka, Foss. Bry. der Orakei Bay, p.113, 
pl. xvii. fig. 3. 
Branches of zoarium triangular; zocecia projecting in alternate 
series of 2-3 zocecia, long pores down the centre of the zoarium, 
and also along the centre of the zocecia; dorsal surface slightly ridged, 
with long pores in longitudinal lines. 
This is related to Idmonea radians, Lamk., a living species, which 
is more slender; and the series of zocecia are in that species nearer 
together. There are in J. Hochstetteriana at least eight double series 
of zocecia without any fresh bifurcation; whereas in my specimens 
of J. radians the branching is much more frequent. 
