282 
MU. A. W. WATERS OX 
‘ Challenger ’ Report. A ‘ Challenger ’ specimen from Tristan da 
Cunhawas submitted to me named L.fimbriata. This is L. echi- 
nata with an ovicell, so that the name fivibria ta must be dropped 
The ovicells sometimes occur as inflations over the central area, 
as in L. grignonensis, B. (see Ann. Mag. Nat. Hist. ser. 5, vol. 
xx. pi. vii. fig. 4), L. novce-zelandice, B .,L. wanganuiensis, Waters 
(Quart. Journ. Geol. Soc. vol. xliii. p. 346), L. Holdsioorthii, B., 
L. echinata, B. ; or it may he nearer to the edge, showing the 
ovicellular ducts as figured hy Mr. Hincks in Lichenopora radiata. 
Although now keenly on the look-out for ovicells, it is a very 
difficult study, which can progress hut slowly and only he done 
satisfactorily with ample material collected from a few localities, 
and one cannot help feeling despair when trying to determine 
the Lichenoporce ; hut it is a genus which, when understood, is 
perhaps more likely than any other to throw light upon the 
Cyclostomata generally and upon some fossil forms. 
Lichenopora californica, Bask. (PI. XV. fig. 1.) 
Unieavea californica, d’Orb. Pal. Frang. p. 972. 
Discoporella californica, Busk, Cat. Mar. Poly. pt. iii. p. 32, pi. xxx. fig. 5. 
Specimens from Port Western (Victoria) given to me by Miss 
Jelly seem to he the species described hy Mr. Busk ; but as 
d’Orbigny’s description might apply equally well to three or four 
species, it seems preferable to consider Mr. Busk as the author. 
The radii are usually bi- or triserial, though in parts only uni- 
serial, and in one specimen most of the rays are uniserial and only 
locally biserial ; the interserial spaces have round or angular cells, 
hut when these interserial cancelli are examined at a level below 
the surface they are usually seen to he round. The mouths of the 
cells are prolonged on the distal margin, namely, the side nearest 
to the border of the zoarium. Zooecial tube about 006 mm. 
wide inside. When the ovicellular cover is removed the central 
area is seen to have large reticulated spaces. The upper part of 
the ovicell is formed by a finely perforated plate extending between 
tire rays like the cogs of a wheel. There is a thick calcareous 
rim at the border of this area. 
The thin calcareous border of the zoarium is not shown, as this 
is very variable in size, and probably of no specific value. 
Loc. California (Busk) ; Port Western (Victoria). 
Lichenopora echinata, MacG. (PI. XV. figs. 2, 3,6.) 
Discoporella echinata, MacG. Trans. Boy. Soc. Viet. vol. xx. p. 127, 
fig. 4. 
