232 PROCEEDINGS OF THK MALACOLOGICAL SOCIETY. 



Unio sp. indet. PL VI, Fig. 1. 



Description. — Shell of oblong, oval contour, compressed, moderately 

 and uniformly convex ; dorsal margin elongate, declining sliglitly to 

 the narrower posterior end, ventral margin nearly straight ; umboual 

 region very anterior, extremities more or less rounded ; sculpture 

 consisting of tine concentric growth-lines with no evidence of radial 

 striations. 



Dimensions {right valve). — Length 60, lieight 30, diameter 14 mm. 



Remarks. — Only a small fragment of testiferous structure is 

 obscurely preserved near the posterior end of this specimen, otherwise 

 the lapidary, in developing its opalescent qualities, has destroyed all 

 the original details of structure. The contour and general com- 

 pression, however, may probably be relied on, although the marginal 

 boundaries are a little uncertain. The sliape appears to bear some 

 resemblance to forms of Unio found in the Judith Kiver Beds 

 (= uppermost Cretaceous) of the United States, such as are figured in 

 Meek's " Invertebrate Cretaceous and Teitiary Fossils of tlie Upper 

 Missouri Country" : United States (ieol. Surv. Terr., vol. ix, pi. xli, 

 1876 (i.e. Unio dance, Meek & Hayden), but without the radial 

 striations that ornament the American shells. The specimen represents 

 an external view of a right valve with the umbonal area wanting, 

 the whole of the interior being filled with a moderately soft kaolinized 

 sandv matrix. 



Zocalit J/. —White Cliffs, New South Wales. 



Collection. — Kev. F. St. John Thackeray. 



GASTROPODA. 

 Fam. NATICID^. 



EuspiKA VARIABILIS (Mooi'e). PI. VI, Figs. 20-3. 

 Natica variabilis and Delphinula reflecta, Moore, Quart. Journ. Geol. 



Soc, vol. xxvi, p. 25(), pl. X, figs. 15, 21, 1870. 

 Natica lineafa, Etheridge, Quart. Journ. Geol. Soc, vol. xxviii, 



p. 342, ])1. xxi, fig. 1, 1872. 

 Delphi?i.ula (?) reflecta, Etlieridge, jun. : Jack & Etheridge, jun., 



Geology and Palceontology of Queensland, 1892, p. 485, pl. xxix, 



fig. 12 ; p. 573, pl. xxxi, figs. 2, 3. 

 Natica variabilis, Giirich, Neues Jahrb., Beilage Band xiv, p. 489, 



pl. xix, fig. 7, 1901; Etheridge, jun., Mem. Hoy. Soc. 



S. Australia, vol. ii, pt. i, p. 42, pl. vi, figs. 15-17, 1902. 

 Pseudamaura rejlecta and Pseudamaura variabilis, Etheridge, jun., 



Mem. Geol. SurvevN.S.W., Palseontologv, 1902, No. xi,pp. 40-3, 



pl. ii, figs. 9-12, '13-16. 



Descriptions {original) : Of variabilis. Shell verj- thick, broader 

 than higli ; spire of 3—4 volutions, somewliat depressed ; body-whorl 

 increasing rapidh', and extended; aperture ovate; umbilicus small. 



Of rejlecta. Shell rather small, turbinated ; whorls 3-4, spire 

 slightly elevated ; volutions separated by an encircling sinus; body- 

 whorl much increased ; aperture circular, with a thick leflected lip. 



