60 NKW SPECIES OF TASMANIA^ MOLLUSCA, KTC. 



described, that I can so place, only two or three of wliich 

 are somewhat abberante. Amongst thean is a little sub- 

 group of four species, closely allied to each other, upon 

 which I now offer some observations, describing one as 

 new. 



EsTEA TUMiDA, Tenison Woods. 



Described in these proceedings for 1875, p. 147, as; 

 Diala tutnuhi, a figure was given by Tate and May for 

 this species, PI. xxvi., fig. 67, which, however, is not cor- 

 rect, but represents a nearly related species, which I am 

 dealing with later. 



A careful examination of the types (two speci- 

 mens) preserved in the Hobart Musieum, and which are 

 very bleached, show it to be a good species, and of which 

 I have taken a fair number of specimens, always from the 

 roots of the giant kelp ; fresh shells are of a pinkish tinge, 

 and have a narrow chestnut band below the suture, and 

 two on the boclv whorl, one at the periphery, and the 

 other on the base. The?ie bands are characteristic. 



The ribs are also bi-oad, strong, and oblique. I pre- 

 sent a figure from a specimen compared with the type. 



PI. XV., fig. 9. 



EsTEA OLiVACEA, Duuker (7?/.vsur/). 



Kixx'ia (l/f'nipjiensis, Petterd, is an absolute synonym, 

 as Tate and May correctly determined, the type being pre- 

 served in the Hobart Museum. This species differs from 

 E. tumid (I in it^ more squat shape, and more numerous 

 ribs, which are narrower and straight ; they also form a 

 nodular bead below the suture. It is common at Tamar 

 Heads, but seems absent from the South, where its place 

 is taken by the next species. 



PI. XV., fig. 10. 



EsTEA KERSHAWi, Tenisou Woods {Bixxoiiut). 

 Rixxoinri l-crsliaini, Tenison Woods, P.R.S. Vict., 1877, 

 p. 57. This was united with E . tnmida, by Tate and May, 

 but examination of the typos in Melbourne Museum shows 

 it to be a distinct, but closely related species. It has three 

 adult whorls, instead of four, the ribs are straighter, and 

 much more numerous, and the month is not so round, and 

 it lacks the colour bands; the usual colour is yellowish- 

 brown, with a pale band below the suture. It is found in 

 the Derwent Estuary and D'Entrecasteaux Channel, and is 

 common at Tamar Heads, with E. oUvacea, which it closely 



