FROSI THE HUIXON COLLECTION. 51 



Remarks. — Hutton's Type specimens seem referable to Artis' 

 species, the figure of which is copier! by Erongniart. This is, 

 without doubt, the creeping rootstock of a Calamite, perhaps of 

 G. Cistii, as tbe fineness of the ribs assimilates it to that species. 

 When divested of the outer cortex it strongly resembles some 

 stems of C. Gistii. Some authors would connect this with C. 

 varians, Sternberg. 



C. cruciatus is, T think, without doubt, the rootstock of Gala- 

 mites Suchowii. 



In the Newcastle Museum Collection there is a rootstock 

 nearly eight feet long, with broad ribs under the cortical covering 

 and very fine indications of joints, which I consider the root- 

 stock of Calamites cannceformis. Much confusion prevails with 

 regard to these stemlike rhizoma, and this is increased by many 

 stems of Calamites being grouped with them and again by true 

 rhizoma being described as stems. 



EOOTS OF CALAMITES. 

 Myriophyllites gracilis, Artis. 



Type — Myriophyllites gracilis, Artis, Ant. Ehyt., pi. 12. 



( V ° SSi ) "z/ v atiC E °f' 1 ^ et H., Eoss. Flora, pi. 110. 

 ( Myriophy lutes gracius, ) ' ' * 



Pinnularia capillacea, ,, ,, pi. 111. 



Hydatica cohwinaris. Artis, Anted. Ehyt., pi. 5. 



,, prostrata, ,, ,, pi. 1. 



Eoot and Eootlets, Lebour, Ill.Foss.Elts.,pl. 10. 



Eootlets „ ,, pis. 59,60,62. 



76. — Myriophyllites gracilis, L. et H. TYPE SPECIMEN, F.F., pi. 110. 

 Specimen about eighteen inches long ; root sending off numer- 

 ous rootlets in all directions. The figure in Foss. Flora much 

 reduced in size, and the rootlets too large in proportion to the 

 main root. Pinnularia capillacea, L. et H., pi. 111., is, no 

 doubt, identical with this species ; and both are most probably 

 the roots of Calamites. 

 Loc— Shale above the Low-Main Seam, Felling. (H. C. 598). 



77. Portion of root, with numerous punctures on its surface, 



sending off rootlets regularly and nearly at right angles : the 

 roots are covered with numerous smaller rootlets or fibres. 

 Loc. — Shale above the Bensham Seam, Jarrow. (H. C. 596). 



