M and Lester Memoirs, Vol. Ivi. (1912), A^«?. 11. 



XVII. On Calamitcs (Calamitiiia) varians, Stemb-, var. 

 insigins, WeisS. 



By Mary A. Johnstone, B.Sc, 



(/^:ead May -jth, igi2. Received for publication July ijth, igi2. ) 



Introduction. 

 An exceedingly well-preserved specimen of Calamites 

 (Calamitina) varians, Sternb., var. insignis, Weiss, came 

 into my possession recently, and considering that certain 

 features are present in very beautiful detail, and that 

 others differ very markedly from those in some recently 

 described specimens, it seems to be worth recording if 

 only for the sake of comparison. 



Occurrence and Description of Specimen. 



Occurrence. I collected the fossil from the quarry of 

 the Bradford Brick and Tile Company (Yorkshire). It 

 formed the core of one of the clay nodules which are 

 abundant in the shale bands lying below the Better Bed 

 coal. 



General appearance. It is a shale cast of a short 

 length of decorticated stem which has been crushed to a 

 much flattened oval in transverse section. The whole of 

 one face, the two rather crumpled edges and part of the 

 other face are free from the embedding substance. Part 

 of the encasing layer was missing ; part was present and 

 has been removed, thus affording a reverse of the features 

 preserved. 



The dimensions are as follows : — 



Length ... ... ... 123 mms. 



Average breadth ... ... 65 „ 



Greatest thickness ... ... 25 ,, 



September 26t/i, igT2. 



