BY c. HeDleY. 313 



This I recognised as an immature individual of M. carbonaria. This 

 species presents two variations, perhaps of sexual dimorphism; the 

 first, badia, shorter, stouter and darker; the second, digna, longer, 

 more slender and paler. The orange line below the suture, and the 

 microscopic punctate stria? are common to both. 



It was a mistake of Tate and May* to unite M. badia Reeve to 

 M. rosettce Angas. The British Museum has three marked types 

 labelled "Mitra rosettae, Angas, Encounter Bay, South Australia. 

 Pres. G. F. Angas, 70/10/26." A clear distinction between the two 

 lies in the sculpture. The spiral grooves of M. rosettoz are widely 

 spaced, like those of M. solida, but the grooves of badia are very 

 fine and crowded. 



Mitra rhodia Reeve. 



Mitra rhodia Reeve, Conch. Icon., ii., 1845, PL xxviii., fig. 225; 

 Id., Marrat, Journ. of Conch., i., 1877, p. 244; Id., Watson, Chall. 

 Zool., xv., 188(3, p. 246; Id., Brazier, Journ. of Conch., vi., 1889, 

 p. 67. 



In the British Museum are two shells marked "Type Mitra rhodia 

 Reeve, Sydney, M.C. Mr. Strange, Sydney, under stones." This 

 species is like .1/. carbonaria, but is smaller, more slender, and 

 lacks the orange sutural line. The types of rhodia and badia are 

 nearly the same length, but rliodia has two more whorls, and two- 

 thirds the breadth of badia. The spiral incised lines of badia are 

 much closer. 31 . rhodia is smaller than M. cookii, and. apart from 

 difference in colour, cookii is more contracted at the base. 



Brazier has noted that Angas mistook 31. badia for M. rhodia, 

 which explains the omission of this species from the latter's lists of 

 Port Jackson mollusca. The original habitat was confirmed by the 

 Challenger Expedition. There are, in London, two examples of M. 

 rhodia from the Tamar Heads, Tasmania. But Marrat's record of 

 this species from West Africa, needs only be mentioned for re- 

 jection. 



*Tate and May, These Proceedings, xxvi., 1901, p. 360. 



