A. H. Foord — Western Australian Fossils. 151 



bifid. The adductor impressions (a) are rather deep, beginning 

 a little below the level of the hinge-teeth, and terminating at about 

 the mid-length of the shell, where they meet a somewhat prominent 

 ridge or septum (s) which extends nearly to the front margin of 

 the valve. This septum divides the large and spi'eading impressions 

 of the cardinal muscles (d) into two areas which occupy nearly one- 

 third of the interior of the valve, and terminate in two short and 

 narrow lobes at the bottom of the septum. The rest of the interior 

 of the shell, with the exception of a narrow marginal zone, is covered 

 with reticulated vascular markings, strong near the hinge-teeth, and 

 becoming less pronounced towards the front margin of the valve. 



I may add that the largest individual in the Collection measures 

 1 inch 2 lines in length, and 1 inch 5 lines in breadth. 



A single, crushed specimen, with both valves, evidently derived 

 from a different matrix from the rest, differs slightly from them 

 in its greater relative breadth. This example is illustrated in the 

 Woodcut (A), together with a portion of its shell-ornament (B), 

 consisting of flattened spines, forming a fringe at the margin of the 

 lamella? of which the shell is composed. A similar spiny investment 

 covers the shell of Atliyris Roysii, to which the present species is 

 probably nearly allied. 



Locality. — Gascoyne River. 



Carboniferous Fossils from the Irwtn River, Victoria District. 1 



POLYZOA. 



Fenestella. 



Fragment of the non-poriferous aspect of a frond of a species of 



Fenestella, probably F. ampla, Lonsdale (Strzelecki's Phys. Descr. of 



New South Wales and Van Diemen's Land, 1845, p. 268, pi. ix. figs. 



3, a-d). 



BRACEIOPOBA. 



Productus tenuistriatus, de Verneuil. Plate VII. Figs. 4, 4a. 



1845. Productus tenuistriatus, de Verneuil, Geol. de la Russie d' Europe, et des 

 Montagnes de POural, vol. ii. pt. iii. Paleont. p. 260, pi. xvi. fig. 6. 



1889. Productus tenuistriatus, Tschernyschew, Allgem. geol. Karte von Russland, 

 Blatt 139 (Mem. du Com. Geol. vol. iii. No 4), p. 372, Taf. vi. figs. 15, a-c. 



There are a few examples of a species which agrees in all essential 

 points with de Verneuil's tenuistratns. This species differs from 

 others of the same genus by the fineness of its stria?, their irregu- 

 larity, and the absence or rarity of the tubes with which the 

 Producti are usually provided. 



The irregularity of the ribbing is referred to also by Tschernyschew 

 as one of the distinguishing characters of temdstriatus, and he adds 

 that there are intercalated ribs between the original ones. These are 

 quite recognizable in the specimens under description. 



Locality. — Irwin River, Victoria District. 



1 An explanatory note by Mr. H. P. Woodward to tlie following effect accom- 

 panied these fossils :—" Irwin River, Coal Seam, a little S.E of Champion Bay, 

 about 30 miles from coast : sandy table-land, cut through by river, exposing ferrugi- 

 nous sandstones and conglomerate, resting uncouformably on Coal-measure Series." 



