Vol. XXviii.] PALEONTOLOGY OF LANCASHIRE COAL MEASUKES. 613 



Gyracanthiis formoms (Agassiz). 



This species is remarkable in that it evidently possessed 

 two forms of spines, one form robust and elongated, and 

 probably borne in pairs on the front edge of the paired fins, 

 the other laterally compressed and broadly triangular in 

 outline. The latter are usually called *' free spines." Free 

 spines are rare in the Lancashire Coal Measures, I only 

 know of the following : — 



From the Stubbs Mine of Bardsley. (L. 2622, e. coll. 

 Cairns, M.M.) 



From the Middle Coal Measures of Burnley. Horizon 

 not stated, (e. coll. Kay-Shuttleworth, M.M.) 



From black bass over the Four Feet Mine at Pendleton. 

 (Binney, Trans. Manch. Geol. Soc, Yol. I.) 



Paired Spines. 



From the Californian or Thin Bed of Fulledge Colliery, 

 Burnley. (W. 968 and W. 972, e. coll. Wild, M.M.) 



From the roof of the Arley Mine, Burnley. {W. 971, e. 

 coll. Wild, M.M.) Associated with a quartzite pebble. 



From the Two Feet Mine of Bardsley. (W. 937, e. coll. 

 Wild, M.M.) 



From Ashton Moss Colliery at 400-500 yards. No 

 horizon stated. (L. 2612, e. coll. Cairns, M.M.) 



From the Stubbs Mine of Bardsley. (W. 1218, e. coll. 

 Wild, M.M.) Associated with Carbonicola. 



In shale over the Californian or Thin Bed, Fulledge 

 Colliery, Burnley. (George Wild, Trans. Manch. Geol. Soc, 

 Vol. IV., p. 185.) 



Listracanthus sp, n. 



From the " Marine Band," Kiver Tame, Dukinfield. 

 (e. coll. Cairns, M.M.) 



Euctenius unilateralis (Barkas). 

 The curious structures known by this nanie are very rare 

 in the English Coal Measures, and little is known respecting 



