311 
FAM. HeLIOPORIDZE. 
Genus Heliolites Dana, 1846. 
Heliolites interstincta Linne sp., var. Gippslandica, var. nov. Plate LX., 
Figs. 35, 36. 
Description. —The specimen to which the above varietal name is ap¬ 
pended measures 9cm. in length, and its greatest thickness is 3.2cm. In 
form it is flat and undulating on the surface of attachment. This variety 
differs from the almost universally distributed type species 1 2 in having the 
autopores (calices) practically unseptate, two or rarely three si 
phono-pores (coenenchymal tubules) between the autopores, and in 
having the tabulae of the latter often deeply concave and never 
quite horizontal. Autopores nearly always circular, with hardly 
any trace of septa, although slightly angulated at twelve equidistant parts 
in the periphery, where they are conjoined to- the walls of the siphono- 
pores. The autopores have a diameter of 1.25 to 1.75mm. Their 
tabulae are deeply concave, and vary from 4 to 5 in the space of one milli¬ 
metre. The siphonopo-res are roundly polygonal or flattened by crowd¬ 
ing, in transverse section; in vertical section they are divided by tabulae, 
and appear as low rectangles, polygons or triangles. The tabulae of the 
siphonopores number from 4 to 7 in the space of one millimetre. 
Observations .-—The species itself occurs at Cave Hill, Lilydale, and 
at Waratah Bay, associated with a characteristic Wenlock fauna. It is 
found at the former place usually in rounded or nodular masses, and more 
rarely with encrusting or explanate coralla. 
The present variety approaches McCoy’s H. megastoma 2 in some re¬ 
spects, as in the rudimentary septation and unusually small proportion 
of coenenchymal tissue, but in that species the autopores are typically 
larger, proportionately ; and since there appears to be some doubt as to 
whether the Ordovician and the Silurian specimens ascribed to that species 
are identical 3 4 , the question of its affinity with ours may here be waived, 
remarking in passing that the Wenlock exaaiples, with their rudimentary 
septa, are closely related to H. interstincta. 
Occurrence .—Cooper’s Creek, Thomson River. 
HYDROZOA STROMATOPOROIDEA. 
Fam. Actinostromidze. 
Genus Clathrodictyon Nicholson and Murie, 1878. 
Clathrodictyon cf. regulare Rosen sp. 1 . Plate LXI., Fig. 37. 
The present specimen is an encrusting form attached to a calcareous 
mud pellet containing fragments of corals, crino-id stem-joints, polyzoa, 
ostracoda, and fragments of tribolites. This portion of a Clathrodictyon 
1. Madrepora interstincta Linne, 1767, Syst. Nat., 12th Ed., p. 1276. Heliolites interstincta L. sp.. 
Edwards and Haime, 1851, Polyp. Foss, des Terr. Palaeoz, p. 214. Id., Brit. Foss. Corals. 1855. p. 249, 
pi LVII., figs. 5, 5 a-d. Rominger. Geol. Surv., Mich., Fossil Corals, p. 11, pi. I., fig. 1. Nicholson, Sil. 
Foss. Girvan. 1880, pp. 57 and 254, pi. XVI., figs. 1-4. Lambe, Contr. Canad. Pal., vol. IV., pt. I., p. 79, 
pi. IX., figs. 6. 6a. 
2. Palaeopora megastoma McCoy. Pal. Foss., 1852, p. 16. pi. I., fig.4. Heliolites megastoma McCoy 
sp., Edwards and Haime, Brit. Foss. Corals, 1855, p. 251, pi. LVIII., fig. 2. 
3. Nicholson, Sil. Foss. Girvan, 1880, p. 248. 
4. Stromatopora regularis Rosen, ‘ Ueber die Natur der Stromatoporen,” 1867. p. 74, pi. IX., figs. 
1-4. Clathrodictyon regulare Rosen sp., Nicholson and Murie, Ann. and Mag. Nat. Hist., ser. 5, vol. XIX., 
1887, p. 10, pi. II., figs 5, 6 ; Nicholson, Brit. Stromatoporoids (Pal. Soc.), 1889, pt. II., p. 155, pi. 
XVIII., figs. 8-1 la. 
