A. H. Foord — Western Australian Fossils. 149 



clearly figm-ed, an enlarged figure of them being given to show their 

 structure. 1 



If now we regard Sp. tegulata of Trautschold either as a distinct 

 species, according to Waagen, or merely as a variety of Musakheyl- 

 ensis, then Davidson's name would still hold good. If, on the other 

 hand, Tschernyschew's views are correct, viz. that Musakheylensis 

 and tegulata are one and the same species, the latter name, being of 

 prior date, must take the place of the former. Waagen holds very 

 decided opinions upon this point. He says, that " the peculiar 

 sculpturing, so similar to that of Musakheylensis, has been excellently 

 described and figured by Trautschold ; but from his description and 

 figures it can also be concluded with very great certainty that the 

 two species are different. In Spirifer tegulatus the radiating ribs are 

 much coarser, and the lamellose sculpturing more strongly developed 

 than in the Indian form, and there is apparently but little doubt 

 that the two species are different. Nevertheless, it is highly probable 

 that the Eussian species, which occurs in the Upper Carboniferous 

 Limestone of Moscow, is the ancestor of the Indian shells." 



After much deliberation, I have thought it best to leave the matter 

 an open question, retaining for the present Davidson's name, which 

 is now so widely current, for the species, making the Australian 

 form a variety of it. Most probably the fossil described by von 

 Martens from the Island of Timur belongs to the latter, the localities 

 of the two forms not being very remote from each other. 



The interior of a ventral valve figured on Plate V. (Fig. 12) may 

 possibly belong to the present species, but the specimen is too 

 imperfectly preserved to be determined with certainty. 



Locality. — Gascoyne Eiver. 



Syringothyris exsuperans, de Koninck, sp. 



1877. Spirifera exsuperans, de Koninck, Reck, sur les Foss. Paleoz. de la Nouvelles- 



Galles du Sud (Australie), pt. iii. p. 249, pi. xv. figs. 1, la, lb. 



1878. Spirifera exsuperans, Etkeridge, jun., Cat. Australian Fossils, p. 56. 



There occur in the Collection numerous fragments of the hinge- 

 plates of this species from the Gascoyne River. Being broken in 

 a peculiar manner, these separate pieces were very puzzling, and I at 

 first took them to be portions of a Lamellibranch ; but my friend 

 Mr. R. B. Newton, to whom I showed them, fitted some of the 

 pieces together, and thus demonstrated their true nature. 



Locality. — Gascoyne River. 



Athyris Macleayana, Etheridge, jun. Plate VII. Fig. 3 (and 



Woodcut). 



1889. Athyris Macleayana, Etkeridge, jun., Proc. Linne&n Soc. New Soutk Wales, 

 second ser. vol. iv. pt. ii. p. 208, pi. xvii. figs. 1 — 5. 



" Shell circular, or transversely oval in outline, but usually the 

 former, plano-convex, or at times slightly concavo-convex, the 

 ventral valve flat or slightly concave ; the lateral margins are in 

 the same plane with the hinge-line, but the front is to some extent 



1 Nouv. Mem. de la Soc. Imp. des Nat. de Moscou, 1860, torn. xiii. pi. xxxv. 

 fig. 6d. 



