134 CARBONIFEROUS AND PERMIAN EORAMINIEERA. 



whether the specimens were actually Textulariee whether they might not belong to 

 some unknown broad variety of one of the uniserial types, the depressed median 

 line being in reality a fracture, the result of pressure on a very thin shell-wall. 

 This supposition received some support from the condition in which the shells are so 

 frequently found, that is, split horizontally. On the other hand, some of the specimens 

 so laid open show distinct duplication of the chamber-walls where the ends meet in the 

 centre of the test, which could not occur, at any rate with regularity, unless they belonged 

 to two series of independent segments. The only other genus except Textularia 

 to which these little fossils bear any superficial resemblance is Prondicularia ; but 

 even in the absence of satisfactory evidence as to the course of the stolouiferous tubes, 

 which are obscure when not entirely obliterated, there is sufficient in the conspicuous 

 characters of the figured specimens to render an affinity with that subtype improbable. 

 So that, notwithstanding the shade of doubt consequent on the peculiarity alluded to, there 

 is at present no valid reason for altering the position in which the species has heretofore 

 been placed, that is, in the genus Textularia. 



It has been necessary to change the trivial name, inasmuch as the term Textularia 

 cuneiformis had been employed by d'Orbigny, 1 previous to the publication of Professor 

 King's work, for another and distinct species. Under these circumstances I have followed 

 the usual custom, which happens to coincide with my inclination, and have associated 

 Professor Rupert Jones's name with the form under notice. 



Distribution. In the Thuringian area, Textularia Jonesi is by no means rare being 

 found in the Kupferschiefer, in the Zechstein proper, and in the Dolomite of the Middle 

 Zechstein. In England it is a very scarce fossil; the only two localities in which I know 

 of its having been collected are at Summerhouse, near Darlington, in the Lower, and at 

 Byers Quarry in the Upper Magnesian Limestone. 



TEXTULARIA TRITICUM, Jones. PI. X, figs. 24, 25. 



TEXTULAKIA TBITICUM, Jones, 1850. In King's Monogr. Perm. Fossils, p. 18, pi. vi, 



%. 5. 

 Reuss, 185-4. Jahresb. d. Wetterauer Gesellsch., vol. for 



18511853, p. 73. 

 Bichter, 1855. Zeitschr. d. deutsch. geol. Gesellsch., vol. vii, 



p. 532, pi. xxvi, figs. 24, 25. 

 Geinitz, 1861. Dyas, Heft 1, p. 122, pi. xx, figs. 36, 37. 



1 Textularia cuneiformis, d'Orbigny, 1826, 'Ann. Sci. Nat.,' vol. vii, p. 263, No. 18, 18-10 ; ' Foram. 

 Cuba,' p. 138, pi. i, figs. 3739. 



