244 W. LT. Hudleston — Fossil Shells from South Australia. 



especially the deep-set punctate furrows, remind us of Avellana, 

 whilst the single fold on the columella is in favour of Actceon. 

 Cf. Action depressus, Moore, Q.J.G.S. vol. xxvi. p. 256, pi. x. fig. 20, 

 and E. Etheridge's Queensl. Pal. pi. 29, fig. 9. 



A single specimen, probably from Primrose Springs. 



Peoten, sp. PL IX. Fig. 5. 



Form orbicular and depressed, umbones pointed, auricles moderately 

 unequal. The shell appears to have been nearly smooth, and the 

 ornamentation was confined to concentric lines. 



It is somewhat more orbicular than Pecten socialis, Moore (vol. cit. 

 p. 248, pi. xi. fig. 9). There is a certain general resemblance to 

 Pecten orbicularis, Sow., and in a less degree to Pecten demissus, Phil. 



A single specimen from Hamilton Station near Lake Eyre. 



Pseudavicula anomala, Moore, 1870. 



1870. Lucina anomala, Moore, Q.J.G.S., vol. xxvi. p. 251, pi. xiv. f. 4. 



1884. Avicula orbicularis, HudL, Geol. Mag. Dec. III. Vol. I. p. 341, PI. VI. 



Fig. 10. 

 1890. Pseudavicula anomala, Moore, Queensland Palaeontology, pi. xxiv. fig. 13. 



Mr. Etheridge, jun., is probably right in assuming that Avicida 

 orbicularis is a synonym of Lucina anomala, though Mr. Moore was 

 very wide of the mark in referring an aviculoid shell to the genus 

 Lucina. As the diagnosis of Pseudaviada is not known to me, I am 

 not able to point out in what respect it is held to differ from Avicula. 



If Mr. Etheridge is correct in identifying Lucina anomala and 

 Avicula orbicidaris, the species occurs both in Queensland and in the 

 Lake Eyre District (South Australia). 



Pinna australis, sp.nov. Plate IX. Fig. 6. 



Estimated length, 160 mm.; full width in front 45 mm. Shell 

 elongate, narrow, deep ; section in front sub-rhomboidal. Dorsal 

 margin nearly straight, ventral margin but little sloped, and slightly 

 incurved. Each valve is unequally divided by a longitudinal ridge, 

 in which is impressed a sulcus forming a line of weakness resulting 

 in actual fracture towards the front. Shell substance rather thick. 

 The ornaments consist of numerous straight longitudinal ribs along 

 the narrow dorsal area, whilst on the wider ventral area the ribs are 

 broader and more curvilinear. 



The materials for a full diagnosis are of necessity wanting where 

 so little of the shell has been preserved ; but there seems some 

 justification for constituting a new species in this case. The form is 

 less wedge-shaped than Pinna cuneata of the Oolites, and in some 

 respects more nearly approaches Pinna tetragona, Sow. (M.O. t. 313, 

 f. 1), where the valves are even more carinated than in this one, and 

 where the section consequently is more thoroughly tetragonal. Our 

 species therefore may be regarded as intermediate between the 

 cuneate and tetragonal forms of Pinna. 



No species of Pinna has hitherto been described, so far as I am 

 aware, from Australia, but there is a fragment of a large Pinna 

 figured in Queensland Palaeontology, pi. 20, figs. 16 and 17, and 



