174 
POLYZOA—TREPOSTOMATA. 
Genus Keterotrypa, Nicholson. 
I-lETEROTRYPA RTJSHWORTHBNSIS, sp. nov. (Platcs XIII. Fig. 6; XV. Fig. 17). 
Description. —Zoarium small, dendroid. Zooecia 1 mm. across, widely 
spaced and generally prominent, lips thickened. Acanthopores generally 
very small, but variable in size, numerous; chiefly grouped round 
the zooecia, or arranged along the ridges joining adjacent zooecia. 
The largest fragment measures 13 mm. in length. 
Observations. —Mr. Robert Etheridge, jun., has already described a Eetero-. 
try pa from the Victorian Silurian beds,^ to which he has given the name 
H. australis. This species, which was obtained from the Yeringian of Sandy’s 
Creek, Mitchell River, Gippsland, is an encrusting form, and not dendroid 
as in the present species. It is otherwise distinct in having comparatively 
large acanthopores, which are disposed in the angles between the zooecia. 
Three fragments in the present collection. * * 
Summary. 
This small collection of fossils, made by Mr. A. M. Howitt, confirms the 
Silurian age of these beds, as determined by McCoy. It also conclusively 
proves them to belong to the later stage, the Yeringian series as shown 
by the occurrence of Heliolites interstincta, var. gippslandica and Pachypora 
alterivalis, both of which are characteristic of the Gippsland Yeringian 
fauna. 
The genus Anisophyllum is here recorded for the first time from Australia, 
being previously known as a Devonian fossil from the Lower Hamilton 
Group of Tennessee, N. America.^ 
The list of determined fossils is as follows :— 
Streptelasma sp. 
Anisophyllum howitti, sp. nov. 
Heliolites interstincta, Linne, sp., var. gippslandica, Chapm. 
Favosites gothlandica, Lamarck. 
Pachypora alterivalis, Chapm. 
Heterotrypa rushworthensis, sp. nov. 
Explanation op Plates. 
Plate XIII. 
Fig. 1. Streptelasma, sp. Natural cast of corallum. X "2,. 
Fig. 2. Squeeze from ditto in plasticene, showing fossula. X 2. 
Fig. 3. Anisophyllum hovitti, sp. nov. Showing cardinal and alar septa 
X 2. 
’ Prog. Rep. No. XL, Geol. Surv. Viet., 1899, p. 34. 
* The range of Anisophyllum is, however, Ordovician to Devonian, according to Eastman-Zittel 
Text-book of Palaeontology, Vol. I., 1913, p. 84. 
