12 THE VIC'JOKIAN NATUUALIST. 



form of Hematite, which under the microscope is seen to occupy 

 all the coarse cleavage cracks, as well as to fill up the numerous 

 thin, incipient cracks in the crystals. Although the pleochroism 

 of Fayalite, like that of Olivine, is feeble, one crystal in the 

 present slide is distinctly pleochroic, and most of the granules 

 show this phenomenon to some extent. 



Specimen 3. — This sample has a specific gravity of 3.26, and 

 is largely composed of Olivine of the variety Fayalite, although it 

 is not so ferriferous as the preceding specimen. The rock has a 

 dark appearance and a rough fracture, whilst the granules of 

 which it is composed have an iridescent and metallic lustre. 

 Under the microscope the rock is seen to consist of Olivine, with 

 rather definite cleavages and a conspicuous development of 

 Schiller structure, normal or obliquely to the cracks, and almost 

 diallagic in character, but in somewhat irregular patches. Other 

 constituents of this rock are some crystals (often well developed) 

 of Omphacite, and a reddish or orange-coloured mica, sometimes 

 enwrapping the former. 



Specimen 4 (from the "red beds"). — A fragment of a finely 

 scoriaceous rock of a red-brown colour, containing a portion of 

 a large porphyritic crystal of Felspar. The Felspar is while, 

 with a vitreous or almost pearly lustre. By its low extinction 

 angle of 7°, measured from a cleavage surface parallel with 

 the brachypinakoid, it is seen to be Oligoclase Andesine. 

 The crystal, although otherwise clear, contains a few included 

 crystals of other minerals, one of which appears to be 

 Hypersthene. 



DESCRIPTION OF TWO NEW SPECIES OF SHELLS OF 

 THE GENUS LEUCONOPSIS. 



By J. H. Gatliff. 



[Rand hvfvrv the Field Naturalists' Club of Victoria, UH/i April, 1905.) 

 Thk genus was founded by Capt. Hutton for the reception of a 

 small mollusc from Auckland, New Zealand — L. ohsoleta, Hutton. 

 Since then Mr. Charles Hedley has described a species from 

 New South Wales. The present paper describes a species from 

 our coast, and a fourth species, from South Australia. 



LeUCONOPSIS VICTORIyE, n. sp. (fig. 1). 



Shell ovate, imperforate, opaque white. Whorls four, very 

 faintly spirally grooved. When viewed from the front the apical 

 whorl is not situated in the centre, but is placed to the left. 

 Inner lip with a well-developed central tooth, and another much 

 smaller anterior one, only visible when the mouth is looked into 

 sideways. Aperture about half the length of the shell. 



Dimensions. — Length, 1.65 mm. ; breadth, i mm. 



Locality 0/' Ty^^e.— Portsea, Port Phillip. 



