91 



Ox\ NEW SPECIES OF VULYPLACOPEORA FROM 

 SOUTH AUSTRALIA. 



Ey W. T. Bkdnall and E. H. V. Matthews. 



Read 9fh March, 1906. 



PLATE IX. 



Chiton aureomaculata, n.sp. PI. IX, Figs. 3-3/. 



Shell elongately oval, carinate, side slope but very slightly arched. 

 Central area apparently smooth, but minutely reticulated under the 

 microscope, and showing no jugal track. Towards the base of the 

 area, on each side, are three sulci which are continuous througiiout 

 the length of the shell, between the laterals, and but slightly indicated 

 on the terminal valves. Colour creamy white, irregularly besprinkled 

 with golden spots, varying in size and shape. Girdle inconspicuously 

 tinged with green. 



Intermediate valves scarcely beaked ; of even width, with the 

 exception of the first, which is nearly double that of the others. 

 Posterior margin smooth. Lateral areas naiTow, with the diagonal 

 indifferently raised, and ornamented with two rows of pustules which 

 gradually increase in size as the margin is approached ; pustules 

 distributed, one row on the diagonal, the other on the posterior 

 margin, intervening space smooth. The anterior valve has a row of 

 8 pustules round the girdle margin, and three on each side of its 

 posterior margin. The posterior valve has also a row of pustules 

 similarly placed to those on the anterior, as well as three pustules on 

 each end of a raised line, which traverses the valve at right angles 

 across the mucro. Mucro central and well defined ; posterior slope 

 excavated. Interior very pale blue. Sinus wide and shallow. 

 Anterior valve with 8 slits, median 1-1, posterior 10. Girdle scales 

 smooth and convex. Length 12, breadth 3-5 mm. 



Ifab. — Marion Reef, Troubridge Island, on a small stone. 



ISCHNOCHITON BESPLENDENS, U.sp. PI. IX, FigS. 4-4/ 



Shell elongately oval, elevated, scarcely carinated, very minutely 

 but regularly punctured throughout, more indistinctly so on the 

 lateral areas and anterior valve. Central valves slightly beaked ; 

 anterior valve larger than the others, and posterior valve with the 

 umbo anterior to the centre. Jugal tract creamy white, radiated with 

 ashen, assuming the appearance of ivory ; pleural tracts a rich golden 

 brown, on which are limned bright blue lines, the lines sometimes 

 broken into irregularly shaped markings. Lateral areas but slightly 

 raised, nevertheless distinct, apparently smooth, but pitted like the 

 remainder of the shell when seen through the microscope. They are 

 of the same ivory tint, and painted with ashen streaks like the jugal 



VOL. VII. — .TUNE, 1906. 7 



