362 PROCEEDINGS OF THE ACADEMY OF [1897, 



Tatea paradisiaca n. sp. PI. IX, figs. 10, 11. 



Shell narrowly pyramidal, the lateral outlines of the spire slightly 

 concave above, apex obtuse. Whorls about 7§ ; the nucleus 

 minute, the first whorl globose and relatively large, following whorls 

 but slightly convex, separated by linear sutures, the last whorl 

 either bluntly angular or rounded at the periphery, swelling in a 

 low varix behind the peristome, theu contracting, rather abruptly 

 falling or deflexed for a short distance in front. Surface shining, 

 showing excessively faint, fine spiral stria? in certain lights. Color, 

 rich reddish-chestnut, becoming a little paler on the spire, and with 

 the peristome of a decidedly darker shade. 



Aperture ovate, rounded above, vertical ; peristome obtuse and 

 thick, continuous. Umbilicus hardly perforated. Alt. 4'8, diam. 

 2 - 5 mm. ; alt. of aperture 1*5 mm. 



Eden, New South Wales, Australia, in a brackish swamp (Dr. J. 

 C. Cox, 1897). 



This species differs from T. rufilabris (A. Ad. 3 ) and T. huonen- 

 sis (Tenison-Woods 4 ) in being much broader in proportion to its 

 heighth, of a darker color, and with strongly developed lip varix. 

 The appearance of marginatum below the sutures, produced by 

 transparence, is more conspicuous in rufilabris and huonensis than 

 in our new species, and both of the former have the spire more at- 

 tenuated above. 



The species of Tatea may be tabulated as follows : 



a. Shell slender, the diameter less than one-half the height, 



b. Peristome very thick and heavy ; a keel defining the 



base, T. rufilabris A. Ad. (pi. ix, fig. 7). 



b'. Peristome rather thin throughout ; peripheral keel 



weak or wanting ; no varix behind the lip, 



T. huonensis T.-W. (pi. ix, fig. 12). 

 a'. Shell stouter, the diameter over half the height ; peri- 

 stome thick ; a low varix behind the lip, 



T. paradisiaca Pils. (pi. ix, figs. 10, 11). 



3 Diala rufilabris A. Ad., Ann. and Mag., Nat, Hist. (3), x, p. 298, 1862. 

 Type locality, Port Lincoln. See also Smith, P. Z. S., 1875, p. 538, where it 

 is referred to Hydrobia, and Journ. Linn. Soc. Lond., XVI, p. 268, pi. 7, f. 

 19 (as Tatea). 



4 By thirria huonensis Tenison-Woods, Proc. Roy. Soc. Tasmania for 1875, 

 p. 77; also for 1878, p. 71, and 1879, p. 72 (Tatea). Type locality, Huon 

 River, Tasmania. See also Petterd, Proc. Roy. Soc. Tasm. for 1888, p. 78, 

 pi. 2, f. 1 (as Tatea rufilabris). 



