SMITH : ON HAXELLA LEUCOSTOMA, LAMARCK. 285 



1913. A. anstralania, Suter, Man. 1^q\x Zeal. Moll., p. 310, pi. xliii, 

 fig. 5. 

 ^rtJ.— East and South Australia, Xew Zealaiul (Xortli Island), 

 Kermadec Islands, Norfolk Inland. 



Chauonia roECiLosTOMA, n.sp. 

 1886. Ranella leiicostoma, var. (?), Sowerby, Journ. Conch., vol. v, 



p. 8. 

 1892. E. leiicostoma, Lamarck, var., Sowerby, Marine Shells South 



Africa, p. 9. 

 1903. Ji. leueoslonia, Lam., var. poecilostoma. Martens, Deutsch. 



Tiefsee-Exped. Valdivia, vol. vii, p. 56. 

 1906. Septa leiicostoma. Smith, Ann. jS'atal Mus., vol. i, p. 41. 



Hah. — Cape Colony and Natal. 



As pointed out bySowerby and Martens, this species differs from 

 Charonia leiicostoma in always having "dark-brown blotches" on the 

 labrum, -which in leiicostoma is invariably pure white. In adult 

 specimens this dark-brown colour also occurs on the outer edge of the 

 callus, which is spread over the columella, and about the middle and 

 above the tubercle on the upper part it forms large suffused blotches. 



There does not appear to be any other marked feature to distinguish 

 the two forms, but judging from six examples from South Africa and 

 eighteen from Australia and New Zealand, the varices on the former, 

 especially on the spire, are less raised and not so deeply pitted 

 behind. ' Also the general form of the shell is a trifle broader. 



