DESeUiri'lONS OK NKW sonil WALKS FOSSILS Kl H KKM l>( IK. 185 



ill a testit'erous condition is M. snbntdidtit, in the (leiringong beds, and 

 althoiigli I have examined a very large number of examples, I have not 

 observed a perforated test, from the locality in question. It would appear 

 as if some layers of the test were fibrous, others punctate, hence I used 

 the term "punctate-fibrous.*" Waagen wrote: — "The shell is coated 

 with an epidei-mis, which exhibits a very distinct punctation . . . The 

 median shell layers show this punctation less distinctly, though it can be 

 well observed in places." No Anstralian Miirtinlopsis, passing through 

 my hands, has been sufficiently well preserved testiferally to exhibit an 

 epidei-mis, but in examples from Greta (Upper Marine Series), which often 

 have the test in a fairly good state of preservation, there is visible on the 

 exteriors a remarkably delicate and fine, longitudinal, tear-like sculpture 

 (PI. xxviii., figs. 2-3), which may be of an epidermal nature, but it is not 

 accompanied by perforations,^ so far as I can see. 



If my determination of the subject of PI. xxviii., fig. 1, as Splrifeni 

 strzelecki, de Kon., be correct, then this species certainly becomes a Mar- 

 tiniopsis, as we are accustomed to view the genus, although in outward 

 appearance it departs more than usual from the form of the Indian 

 shells. It is pauciradiate, with only two costse on either side of the fold, 

 and a possible indication of a third. 



The original of PI. xxviii., fig. 1, is in the Berry School of Arts, and 

 was obligingly lent to me by the then Hon. Curator, Mr. T. R. Lewers. 



Lor. — Nowra Hill, Shoalhaven, Illawarra District. 



Hor. — Upper Marine Series. 



Martiniopsis subradiata, vitr. 



branxtonensis, var. vnr. 



(PI. xxviii., figs. 5 and 6, and PI. xxix., figs. 1 and 2.) 



06.s\ — A very remarkable development of oui- characteristic Permo- 

 Carboniferous ^fartilliop)il.•^ siiJiritJlatu occurs in both the Upper and Lower 

 Marine Series of the Maitland District. 



The fossils are always in the condition of limonitic (internal) casts, or 

 kernels, and whilst representing more than one of the larger varieties of M. 

 subradiata, they are invariably small, but at the same time there is amongst 

 them a wonderful general uniformity in size. This is one of the out- 

 standing features, although thei'e are, here and there, specimens of larger 

 examples of M. siihradiata. These Brachiopods are not the only organisms 

 of both the Lower and Upper Marine beds, at Farley and Branxton, in 

 this dwarfed condition, a phenomenon it is difficult to account for other 

 than on the supposition that glacial conditions known to have existed at, 

 or about, the time of the deposition of the strata in question were conducive 

 to it. 



Amongst the casts are examples of the equivalents of the following 

 varieties of M. subradiata proper : — 



■• Etheridge— Geol. Pal. Q'land, etc., 1892, p. 238. 

 5 Perforations were observed by Morris. 



