92 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



tract. Girdle creamy white, clouded at regular intervals with dark 

 brown. Scales large, regular in disposition, rounded, and sraooth. 

 Anterior valve with 9 slits, central valves 1-1, and posterior valve 11. 

 Length 25, breadth 15 mm. 



Mai. — St. Vincent and Spencer's Gulfs. 



This species is a close ally to the South Australian form of 

 /. stnaragdinus, Angas, but is appreciably different. It attains 

 a larger size, and is remarkable for a very distinct and brilliant pattern 

 of coloration, more particularly when viewed alive in its natural 

 element. 



[This species was discovered by Mr. Matthews, who has taken all 

 the specimens yet found in our waters ; but I have seen an example 

 which was obtained in the adjoining colony of Victoria. — W. T. B.] 



Onithochiton Ashbti, n.sp. PI. IX, Figs. 2-2^. 



Shell oblong, much elevated, valves rounded dorsally, side slopes 

 rapidly descending. Central area smooth, cream-coloured, with spots 

 and blotches of blood colour, more especially on the jugal tract. 

 Intermediate valves beaked. Lateral areas ornamented with a double 

 row of warty nodules of variable size, which, in some cases, coalesce. 

 A single row on the edge of the posterior margin. Anterior valve 

 •with numerous little warty excrescences irregularly but not closely 

 disposed over its whole surface. Posterior valve one-half the width 

 of the other valves, which are of even width throughout. No slits 

 visible. Girdle felty, but under the lens covered with minute scales, 

 irregular in size and shape, like grains of sand. Sinus wide and deep 

 for a shell of this size. Length 8-5, diam. 4-5 mm. 



ITah. — South Australia. 



The figures of this species were not drawn by Mr. Thomas, and are 

 not very successful. 



Lepidopleurus Matthewsianus, Bednall, n.sp. PI. IX, Figs. 1-1/. 

 Shell elongate, regularly arched ; keel and lateral areas indistinct, 

 but clearly defined when seen through the lens ; jugal area absent ; 

 lateral slopes rounded. Colour grayish white. Anterior valve closely, 

 minutely, regularly, radiately granulated throughout. Central valves 

 similarly ornamented, the granulations running longitudinally on the 

 dorsal area, and radially on the lateral areas, the granulations by 

 their direction defining the areas. Sutural plates small, triangular, 

 and very distant, the jugal sinus consequently being exceedingly wide; 

 posterior dorsal margin straight. Posterior valve as the others, and 

 with prominent central obtuse elevated apex, the slope to the margin 

 being slightly concave. (Bednall.) Length 9, breadth 3-5 mm. 

 Eab.—^i. Vincent Gulf. 



