SOME NEW OR UNFIGURED AUSTRALIAN SHELLS — HEDLEY. 



25 



valve has a broadened margin, which, except for a space on the 

 anterior side, is occupied by alternate pits and bosses, to the num- 

 ber of about twenty-tive. These evidently serve to interlock the 

 valves, and have no relation to the external riblets. Ligament 



Fig. (5. 



short, submedian. Anterior hinge crenulations long and well 

 developed. Muscular scars indistinguishable. Height, 2 15 mm.; 

 length, 2'1 mm. 



Habitat. — Two complete specimens, apparently taken ali\ e, were 

 obtained in November, 1880, in thirty-five fathoms, off Broughton 

 Islands, Port Stephens. They are enumerated as "No. 116, Area? sp. 

 nov." in the Annual Report of the Australian Museum for 1881, 

 p. 22. There are also three specimens in the Museum, labelled 

 "Port Jackson." 



This species is easily distinguished as being less inequilateral 

 than any member of the genus yet found. In agreement with com- 

 parative symmetry are the shorter ligament and better balanced 

 hinge. It may be appropriately called by the name of one to whom 

 we owe all our knowledge of the Australian Philohrya.^ 



Periploma micans, n. sp. 



(Fig- 7). 

 Shell broadly ovate, rostrate, inequivalve, not thin but very 

 brittle. Inside nacreous with a brilliant silvery lustre; where the 

 thin surface layer has flaked off, the nacre is visible outside. 

 Beak fissured. Colour ochreous. Sculpture — there are a few low, 

 broad concentric undulations, which are imprinted on the interior. 

 The rostrum is defined by a narrow, shallow, but sharply impressed 



5 Tate— Trans. Roy. Soc. S.A , xxv., pt. ii., 1898, p. 86. 



