28 
Genus — SPIRIPER, Sowerhy. 
Spirifer crispus, JELisinger. 
Terehratnla cris'pa^ Hisinger, 1826, Vet. Akad. Handl. pi. 7, fig. 4 (non Anomia crispa 
Linn.) 
Spii'ifer crispus, Von Bucli, 1837, Ueber Delthyris, p. 40, 
Spirifera crispa, Davidson, 1871, Mon. Brit. Sil. Brack , p. 97, pi. 10, fig. 13-15. 
This little species is the only one of the genus whose presence I have 
been able to prove in the Silurian of Australia. It is easily recognised by the 
presence of three, five, or seven thick folds on the dorsal valve, of which the 
median, a little larger than the others, forms the fold. The ventral valve, a 
little more arched than the other, has one or three folds on each side of the 
sinus. Usually the surface is traversed by concentric lines or small furrows 
which are almost entirely wanting in the Australian specimens Ihave before me. 
Horizon and Localities. — Mr. Davidson states that this species is very 
common in the Upper Silurian, and in England is found in the Llandovery. 
This is exactly the position it occupies at Dangelong, Australia, where 
numerous impressions of it occur in an ochreous or olive-coloured shale, more 
or less hard, in Avhich it is associated with several other species characteristic 
of the same formation ; it has also been collected at llock Elat Creek, to 
the east of Monaro. 
MERISTELLA, Hall. 
Meristella tumida (?), Lalman. 
Terehraiula oibtusa, Sowerby, 1815, Trans. Linn. Soc. London, XII, p. 516, pi. 27, fig. 3-4, 
Atrypa tumida, Dalman, 1828, Vet. Akad. Hand!., p. 134, pi. 5, fig. 3. 
JHcrista ,, Sebmidt, 1858, Archiv. IsTatur. Liv.-Estli. und Kurlands, II, p. 209. 
ALcristella ,, J. Hall, 1860, Ann. Kept. Eegents State Cabinet X. York, XIIT, p. 73. 
„ „ Davidson, 1866, Mon. Brit. Sil. Brack., p. 109, pi. 11, fig. 1-13. 
Although I have examined but one rather incomplete specimen of the 
Brachiopod I refer to this species, I have little doubt as to its identity. This 
specimen has exactly the shape Mr. T. Davidson represents in Plate xi, 
