184 RECORDS OF THE AUSTRALIAN MUSEUM. 



Log. and Hor. — Railway Cutting at Farley, near West Maitland 

 — Lower Marine Series; ? Wollongong, Illawarra District, and? 

 Richmond Vale, as above — Upper Marine Series. 



Stutchburia obliqua, sj). nov. 



(PL xxxi., fig. 3.) 



Sp. Char. — Shell transversely obliquely oblong, slightly modioli- 

 form ; length two to two and a quarter inches, depth one and one- 

 eighth to one and a quarter inches ; valves moderately convex, 

 narrowing anteriorly, and expanding to some extent posteriorly; 

 dorsal and ventral margins sub-parallel, the former straight, but 

 not as long as the shell, the latter with slight inflections anterior 

 to the greatest convexity of the valves ; anterior ends remarkably 

 small, the margins obliquely rounded, posterior ends becoming 

 flattened, the margins obliquely rounded above and below; greatest 

 convexity anterior to the valve centres, with ill-defined cinctures 

 from the umbones, which are almost terminal ; ligamental fulcral 

 grooves well marked ; anterior adductor scars small, somewhat 

 triangular and immediately beneath the umbones, with slightly 

 thickened posterior margins, posterior atlductor scars inconspicuous; 

 sculpture consisting of well marked close concentric laminae, 

 arranged in broad growth zones, crossed by radiating costse (six 

 in one example, ten in another), all posterior to the shallow cinc- 

 tures, and widening from one another on and above the diagonal 

 ridges, with a generally roughened surface. 



Obs. — This species differs from all the foregoing forms in its 

 obliquity, and somewhat modioliform outline. It resembles S. 

 costata in the presence of the posterior radiating costse, but the 

 two cannot otherwise be mistaken for one another. It is a com- 

 paratively much broader species than either S. simplex or ^S'. 

 farleyensis. It is known to me both in the testiferous condition, 

 and as an internal cast, the former being in the collection of the 

 Geological Survey, the latter in our own. 



Loc. and Ilor. — Jervis Bay, Shoalhaven District (cast) — 

 Upper Marine Series; Farley (testiferous) — Lower Marine 

 Series. 



Genus Pleuropiiorus, King, 1844. 



(Ann. Mag. Nat. Hist., (1), xiv., 1844, p. 313,) 



Obs. — Notwithstanding the fact that the shells referred to this 

 genus by De Koninck and myself do not fall within its limits, we 

 still have, I believe, a true and undescribed PUuropliorns in our 

 Permo-Carboniferous rocks. It occurs commonly at Farley with 

 Stutcliburia farleyensis, and is often mistaken for it, a little 

 examination, however, will at once enable the difFei'ence between 

 the two to be detected. 



