of the Rocks associated with the Coal of Australia. 233 



Spirifera avicula (Sow.). 



Abundant in the sandstones of Korinda, also occasionally in 

 the limestone of Black Head, N. S. Wales. 



Spirifera Darwinii (Mor.). 

 Common in the sandy schists of Loder's Creek and Barraba \ 

 more rare in the arenaceous limestone of Black Head, N. S. 

 Wales. 



Spirifera subradiata (Sow.). 

 Common in the sandstone of Muree, in the arenaceous lime- 

 stone of Black Head, in the schists of Wollongong, and in the 

 fine sandstones of Darlington, N. S. Wales. 



Spirifera subradiata (?var. resembling S. glabra). 

 Common in the sandstone of Maitland, and in the arenaceous 

 limestone of Irrawang, N. S. Wales. 



Spirifera attenuata (Sow.). 

 Specimens perfectly undistinguishable from the larger variety 

 so abundant in the lower carboniferous shales of Ireland (as at 

 Hook Point, co. Wexford), are common in the arenaceous shales 

 of Dunvegan, N. S. Wales. 



Spirifera Tasmaniensis (Mor.). 

 Common in the hardened schists of Lewin's Brook, N. S.Wales. 



Spirifera lata (M'Coy). PI. XIII. fig. 7. 



Sp. Char. Transversely rhomboidal, moderately gibbose, width 

 four times the length ; sides flattened, regularly attenuating to 

 the very acute cardinal angles ; cardinal area broad, flat ; me- 

 sial fold wide, defined, angular, smooth; about sixteen to 

 eighteen slightly convex, simple, smooth ribs on each side of 

 the mesial fold, becoming indistinct as they approach the car- 

 dinal angles, so as to leave nearly a third of the length of the 

 sides smooth. 



This differs from the widest varieties of the S. disjuncta (Sow.) 

 by its defined and smooth mesial hollow, extent of the smooth 

 space at the end of the sides, and the smaller number and greater 

 width of the radiating ridges, which are also much less promi- 

 nent ; the smoothness of the mesial fold and width of the car- 

 dinal area separate it from the S. convoluta (Phil.) ; and from the 

 S. Rcemerianus (Kon.) it is known by its size, greater width, 

 smooth cardinal extremities and flatter and wider lateral ridges. 

 Length 1 inch 1 line, width 4 inches. 



From the hard schists of Lewin's Brook, N. S. Wales. 

 Ann. fy Mag. N. Hist. Vol. xx. 17 



