66 



cally lamellose. It is pellucid white, but encircled with a band 

 of maroon colour, corresponding with the edge of the shell; it is 

 very tough, and can be readily removed in one piece. 



The shell is of a primrose-yellow colour, thin, concentrically 

 striated, and with a few obscure radial ridges. 



The animal is of a deep port-wine colour ; the foot is circular 

 in outline, with an extended margin ; the underside of the mantle 

 is covered with small white carunculse. 



Dimensio7is. — Transverse diameters, 19 and 15; height, -i 

 millimetres. 



Localities, — Lower end of the South Channel of Port Phillip, 

 seven to sixteen fathoms, sand and weed (J. B. Wilson). It has 

 also been collected more than once in St. Vincent Gulf. 



Lobiger ^Wilsoni, spec. nov. Plate xi., fig. 12. 



Animal with the body produced into a very narrow, pointed, 

 smooth tail of a green colour, shortly extended beyond the shell. 

 Foot with two oblong-rounded and pale-green lobes, w-hich are some- 

 what attenuated into a broadish stalk. 



Shell thin, flexible, straw-yellow ; spire rudimentary but invo- 

 lute. Somewhat pyriform, slightly attenuated in front, and 

 truncated apically ; aperture narrow-ovate, truncate behind. 

 Surface finely striated. Length, 8 ; width, 5 millimetres. 



Locality. — Lower end of South Channel of Port Phillip, seven 

 to sixteen fathoms (J. B. Wilson). 



EXPLANATION OF PLATE XI. 



1. Ccelodon patulus, Tafe. Enlarged 



2. Montacuta semiradiata, TaU\ Much enlarged. 



3. Raeta meriodionalis. Ta/e. Natural size. 



4. Mactra Matthews!, Ta^e. Slightly enlarged. 



5. Ephippodonta McDougalli, Taie. a, Shell enlarged ; /', the valves laid 



opened to display cardinal teeth and cartilage, much enlarged. 



6. Cardiaum eragatum, TaU. Slightly enlarged. 



7. Carditella subradiata, TaU. Much enlarged. 



8. Voluta Adcocki, Ta/e. Natural size. 



9. Stylifer brunneus, Taie. Enlarged. 



10. Venerupis iridescens, TaU\ Slightly enlarged. 



11. Umbrella corticalis, Tale. Natural size. 



12. Lobiger Wilsoni, Taie. Enlarged. 



13. Teredo fragilis, Tafe. a, Tube, natural size ; l>, a pallet much enlarged j 



c, siphonal orifice of tube, enlarged. 



14. Kellia rostellata, TaU. Much enlarged. 



