350 GEOLOGY AXn PETROLCKIY OF THE GREAT SERPEXTIXE BELT OF N.S.W., 



ExTOLiril AVICULATU.M (Swullow). 



Etheridge and Dun, Mem. Geol. Sur. N.s;A\'., P:i1. No. 5, Vol. ii., Pt. 1. 1000, p. 

 30, t. 15, f. 1-4 and Bildiu.m-aiiliy. 

 This form was obtained by Cullcn from Mt. Uriari, near Sonierfon. 



Entolipm sp. indet. 



An indetermin'ite form belonging to this genus, represented by S]ii'i'imen 

 r.'45il in the collection of tlie Geological Survey. 



AVICULOPECTEX SPP. IXDET. 



cf. Aviculopecten knockonensis, De Koninck, 1877, Pal. Foss. N.S.W. (1898), p. 

 232; Avieulopeclen granosus, ibid., p. 234, t. 22, f. 10; Aviculopecten 

 .^p., Etheridge and Dun, Mem. Geol. Sur. N.S.W., Pal. 5, 1904, p. 14, 20, 

 t. 15, f. 10, 11, 12. 



Indeterminate forms, which, according to Etheridge and Dun, are not deter- 

 minable specifically. lia\c l)een obtained by Cullen from the hills west of Mt. 

 I'riari. Two of these may be similar to the forms which De Koninck compared 

 with .1. yranusus and A. knockonensis respecUvely, and a third form also is 

 present. 



LeIOPTERIA (?) AUSTRALIA Eth. HI. 



Etheridge, Juur., Rec. Geol. Surv. N.S.W., v., 1898, p. 178, t. 19, 1. 19. 



This form is represented by Specimens 4539, 4508, 4571 and 4579 in the col- 

 lection of the Geological Survey, which were obtained l)v Cullen in the hills west 

 of Mt. Uriari. 



SCALDIA SP. ixuET. (Plate xxi.. (ig. 9.) 



tScaldia, Kyckh(jlt, Melanges Palaeontologiqucs, 1852. t. 10, f. 24-20: ,i,i(l., 1853, 

 p. 07. 



This form is a single right val\-e, oblong-ovaie in shape, with the beak slight- 

 ly anterior, and the surface ornamented with tine radial striae and delicate concen- 

 tric gi'owth lines. The shell substance is thin. Its dimensions are: Length of 

 hinge-line, 27 mm.; breadth of valve, 33; height of valve, 27; thickness, 11. 



It is less elongate than the form described as Scalilia ? depressa by De Kon- 

 inck,* derived from the Burindi rocks of Huchan on the Gloucester Kiver, and 

 differs also from the Belgian forms described by the same author, and also from 

 the American forms to which we have made reference. It is not, however, suffi- 

 ciently well jireserved for specific description. The specimen is in the collection 

 of the Australian Museum, and was t)btained by Mr. Donald Porter from Carroll. 



GASTROPODA. 



Ptvcoiiphalus cullexi, si>. nov. (Plate xxiii., iig-s. 12,14.) 



Pliicompludus, Agassi/., Tradnct. Conch. Min. .U> Sowcrby. 1838. \>. 222, t. 115. 

 f. 1 , 2, 3. 

 Thi' shell is turbinate, elevated and markedly uiiibilicate, consisting of alumt 

 five whorls with imi)ressed sutures. The aperture is sul)-circulai-. The slit-band 

 is placed medianly between two prominent ridges, and aliove the np|)'T of these 

 ridges there are five finer ridges, while below, between the slit-band and the 



•Pal. Poss. N.S.TV.. (1898). p. 20:^, t.l."). f.f)- 



