8 THE VICTORIAN NATURALIST. 



Sphcerococcus. The only other species in which they occur are 

 injlatipes, Mask., popidi, Mask., leaii, Full., and teiq)eri, Full., 

 all of which are easily separable by the character of their 

 coverings, the two first secreting waxy tests, while the other two 



inhabit galls. 



EXPLANATION OF FIGURES. 



\.—Aspidiotus subrubescens, var. corticoides, extremity of pygidium of 

 female. 



2. — Aonidia pidchra, male puparium. 



3. — Do. pygidium of female. 



4. — Mytilaspis cassinia;, adult female. 



5. — Do. pygidium of female. 



e.— Mytilaspis hynienanthera, extremity of pygidium of female. 

 . •j.—Chionaspis Candida, extremity of pygidium of female. 



^,—Sph(Vrococais puslulaiis, adult female, ventral view. 



NOTES ON THE VOLCANIC HISTORY OF MOUNT 



SHADWELL, VICTORIA. 



By J. T. JuTSON. 



With an Appendix by F. Cliapman, A.L.S., on Some Rocks and 



Minerals from the Locality. 



(Communicated by F. M. Chapman.) 



{Read be/orethe Field Naturalists' Club of Victoria, I'Sth March, 1905.) 



The observations which I desire to submit for your consideration 



appear to me to throw some light on the volcanic history of 



Mount Shadwell, a point of volcanic eruption of the Newer 



Basalt period, near Mortlake, in the Western District of Victoria. 



The sections to be described are splendid examples of their 



kind, and it is hoped that this paper may direct some attention 



to them. 



Literatitre. — This consists practically of bare records. The 

 following are the only references 1 have been able to find : — 

 Selwyn, 1866.* Mount Shadwell is included in his list of craters 



and points of eruption ; but it is a record only. 

 Catalogue of the Rocks of Victoria in the Technological 

 Museum, 1894,! which mentions the Mount as a locality 

 for the occurrence of tuffs, scoriae, lapilli, a bomb, and 

 Oligoclase. 

 Prof Gregory, 1903. 1; A reference to the quarrries at the 



Mount as showmg good sections of volcanic scoria. 

 Prof. Gregory, 1904. i5 The aboriginal tradition of the eruption of 

 Mount Shadwell is referred to ; and a statement made that 

 the Mount looks much older than the craters of Mount 

 Noorat, respecting which there are no traditions. 



* Exhibition Essays. 



t This is based on the Catalogue issued by Ulrich in 1875, in which, 

 however, no references to Mount vShadwell are made. 



+ " Geography of Victoria," p. 192. 



§ "The Antiquity of Man in Victoria," Proc. Roy. Soc. Vic, vol. xvii. 

 (N.S.), part I, pp. 134 and 136. 



