454 CENSUS OF THE MARINE MOLLUSCA OP TASMANIA, 



The whole conformation of this evidently very young shell as 

 compared with an equal-sized M. umhilicatus suggests near 

 specific affinity. 



Dimensions of type : length 5 (vix), breadth 275 mm. A few 

 other examples in other collections agree perfectly with the type. 



JosF.PHA Tasmanica, Ten.-Woods. 



The transference of this species to Phos by Dr. Verco has not 

 our approval. J. Tasmanica has the characteristic aperture of 

 Cominella and the plications on its columella are totally distinct 

 from the twisted and ridged basal part of the columella in Phos. 



Phos tenuicostatus, Ten.-Woods (Cominella). 



This is the living analogue of a distinctive group of species in 

 the genus Phos, occurring in the Older Tertiary (chiefly Miocene) 

 of Australia. The group is characterised by its arched columella, 

 twisted and ridged at its front, and by its stout subcylindrical 

 pullus of three or four whorls; the simpler ornamentation, feeble 

 columellar twist, and the form of the protoconch remove these 

 species from the more tj^pical ones, e.g., P. senticosus. Among 

 the fossil species, P. teyiuicostatus comes very near P. cominell- 

 oides; and among the trivial differences, the most apparent is the 

 slightly shouldered whorls of the fossil. 



MiTRA Legrandi, Ten.-Woods. 



The type and two examples referred to the same species 

 identified by the Eev. Ten.-Woods, were given to one of us by 

 Mr. Legrand. The first has a length of 4 mm., three spire whorls 

 and a cylindroid pullus of two smooth red-coloured turns; there 

 are four plaits on the columella, the anterior one of which is 

 somewhat immature. South Australian examples have been 

 traced up to a length of 5 mm., with four spire-whorls and four 

 well-defined plaits. The so-called cotypes are those referred to 

 by Ten.-Woods as larger examples of M. Legrandi, but they are too 

 large and stumpy to be attached thereto, and they represent the 

 juvenile state of M. Schomhurgki, most accurately represented by 

 Mr. Hedley's illustration of this so-named M. Legrandi. 



