MISCELLANEA. 89 



in B. arcuata and its congeners, correct the first impression. We leave this passage-form 

 of weak Beyrichian alliance for further observation. 



The specimen figured has a length - 88; height -48 ; thickness -4 mm. (proportions 

 22 : 12 : 10) ; and is from the Axinus-bed in the Lower Carboniferous of Randerstone, 

 Fifeshire. 



3. PI. VII, figs. 17 a, b, c, was drawn at first as an abnormal Entomis, owing to its 

 concentric ornament and central depression ; but the latter, more like that in Kirkbya, is 

 not equal to the deep transverse sulcus of Entomis (see PI. IV, figs. 20, 21, 26) ; and 

 the ornament resembles that of Kirkbya costata, M'Coy. 1 



The specimen is in length 128 ; height '68; thickness *72 mm. (proportions 32 : 

 17:18), and is from Brockley, Lesmahagow, Mr. D. Robertson's Collection. 

 1 ' Annals Mag. Nat. Hist.,' ser. 3, vol. xviii, 1866, p. 43. 



