Art. VJI. — On Some New Species of Victorian Mollusca, 



No. 6. 



By G. B. PRITCHARD and J. H. GATLIFF. 



(With Plate XV.). 

 [Read 11th June, 1903.] 



The present paper includes descriptions and figures of the 



following species : — 



Zenatia victoriae, sp. nov. 

 Modiola victoriae, sp. nov. 



Also observations on our commonest species of Chione, together 



with figures of the same, namely : — 



Chione strigosa, Lamarck. 

 Chione scalarina, Lamarck. 

 Chione peronii, Lamarck. 



We have to thank Messrs. D. W. Paterson, senior and junior, 



for the care bestowed on the photographs of these shells, and on 



their reproduction. 



Zenatia victoriae, sp. nov. (PI. XV., Fig. 3). 



Description. — Shell elongate-oval, thin and compressed, with a 

 full and well-rounded anterior end, and slightly attenuate both 

 ventrally and dorsally towards the posterior end. Shell greyish- 

 white and shining, where not covered by a light greyish-brown 

 fine longitudinally striate epidermis, which is very thin and 

 glossy. 



Umbos small and well-defined and situated at a distance of 

 one-third of the length of the shell from the anterior margin. 

 Ventral margin nearly straight, only slightly sinuated. 



The surface of the valves is very finely concentrically striated, 

 the regularity of the striae being interfered with by the lines of 

 growth, the concentric sculpture is also delicately radially striate, 

 and this is distinctly visible under a lens. 



Interior white, cardinal teeth, two and one rudimentary 

 posterior lateral in each valve ; the lineal groove of the cartilage 

 plate makes an angle of 20 to 30 deg. with the posterior hinge 

 line ; the internal thickening beTow the umbo or transverse ossicle 



