682 STUDIES ON AUSTRALIAN MOLLUSCA, xiii., 



As Dr. Lamy kindly points out to me, this shell has a general 

 resemblance to Area nodidosa Miiller, from the North Atlantic. 

 The Australian shell is, however, sharply cancellated, while the 

 radial lines of A. nodidosa aie broken before reaching the con- 

 centric. Our shells are also much smaller and rather more 

 inflated. 



Chama FIBULA Reeve. 



Chama fibula Reeve, Conch. Icon., iv., 1846, PI. v., fig.27; Id., 

 Melvill t Standen, Journ. Linn. Soc. Zool., xxvii., 1899, p.l93. 

 Chama jukesii Reeve, Proc. Zool. 8oc., 1846 (1847), p.l20; Id., 

 Conch. Icon., iv., 1847, Pi. vii., fig.39; Id., Schmeltz, Cat. Mus. 

 Godeff., v., 1874, p.l72; Id., Smith, Chall. Rep. Zool., xiii., 1885, 

 p. 172. Chama pellis-phocoi Reeve, Proc. Zool. 8oc., 1846 (1847), 

 p.ll8; Id., Reeve, Conch. Icon., iv., 1847, PI. ix., fig. 54 ; Id., 

 Melvill & Standen, op. cit., p. 193. C. bellisphoccB Clessin, Conch. 

 Cab., 1889, p,37, PI. 17, tig. 1. Chama spinosa Angas, Proc. Zool. 

 Soc, 1867, p. 925 (not Broderip). Chama reflexa Angas, Proc. 

 Zool. Soc, 1871, p.lOO (not Reeve). 



A small Cliatna is not uncommon on stones between tide- 

 marks in the sheltered parts of Sydney Harbour. It is firmly 

 attached by the greater part of the left valve, the opercular valve 

 usually pitched at a high inclination to the base; it is orbicular, 

 with a sculpture of small, crowded, erect, subtubular scales, and 

 attains a diameter of 45 mm. I have di'edged this species also 

 in Port Curtis and off Cape York, Queensland. No other species 

 of this genus comes as far south as Sydney. 



The first mention of Chama from this State is Lamarck's note 

 that the variety (b) of C. ruderalis comes from Port Jackson. 

 Both Delessert and Chenu* illustrate C. ruderalis as attached 

 by the apex of the right valve. In size and general appearance, 

 it is conformable to the Sydney shell. In South and West Aus- 

 tralia, there is a species which is usually sinistral, and exception- 

 ally dextral, and may, therefore, be Lamarck's species. If 

 Chenu's tigs. 2b, 2c represent Lamarck's var. (b), then the locality 

 ascribed to it is erroneous. 



* Delessert, Recueil, 1841, PI. xiii., figs.5, a, b. Chenu, Illustr. Conch., 

 1846, Pi. 5, figs. 2, 2a, 2b, 2c. 



