ON GLYCIPHAGUS DOMESTICUS AND G. SPINIPES. 
285 
Lichenopoea Holdswoethii, Busk. (PI. XV. figs. 7 & 8.) 
Discoporella Holdsworthii, Bush, Cat. Mar. Folyzoa, pt. iii.p. 33, 
pi. xxx. fig. 4. 
Liclienopora Holdswortliii, Waters, Quart. Journ. Geol. Soc. vol. xliii. 
p. 347 ; Ann. Mag. Nat. Hist. ser. 5, vol. xx. p. 261. 
I have already (Quart. Journ. Geol. Soc. xliii. p. 347, and else- 
where) alluded to the “ rays ” in the zooecial tubes and cancelli, 
and to Mr. Busk perhaps referring to these when lie speaks of 
stellate pores 
The ovicell occurs as a central inflation with large roundish 
depressions closed with a perforated pellicle. It spreads in 
between the radii in somewhat the same manner as in L. californica 
though not so marked on the surface. I have only seen the one 
ovicell; and if this was the only specimen of L. Holdswortliii 
known, I doubt if it would be possible without breaking up the 
specimen to decide whether there was an ovicell. 
Loc. Living: Ceylon; Victoria; ‘ Challenger ’ station 142 (S. 
Africa). Fossil: Waipukurau (New Zealand). 
EXPLANATION OF PLATE XY. 
Fig. 1. Lichenopora californica, Busk. Showing ovicell extending between the 
radii. From Port Western (Victoria). X 12. 
2. Cancellus of L. echinata showing denticles. X 85. 
3. Lichenopora echinata, MacGr. Shows to the left the lower surface of the 
ovicell formed by reticulated cells covered with a pellicle. The upper 
surface is pitted. X 25. 
4. Lichenopora victor iensis. Show's ovicell and two ovicellular ducts. From 
Port Stephens, 5-6 fath. (New South Wales). X 25. 
5. Discotubigera lineata, MacG. Shows the ovicell at the border of the 
colony, and also the ovicellular duct. From Port Jackson (New South 
Wales). X 25. 
6. Lichenopora echinata. Shows the formation of the ovicell which starts 
from several points to meet over the centre. From Port Phillip. X 12. 
7. Cancellus of L. Holdsworthii, showing rays, x 85. 
8. Lichenopora Holdsworthii, B., with ovicell. From Port Phillip. X 25. 
Researches into the Life-histories of Glyciphagus domesticus and 
G. spinipes. By A. D. Michael, F.L.S., F.Z.S., F.B.M.S. 
[Read 3rd May, 1888.] 
(Plate XYI.) 
Foe over three years last passed I have been, as opportunity 
offered, endeavouring to elucidate certain obscure points which 
I had observed in the post-embryonic development of the common 
