74 GENERIC AND SPECIFIC CHARACTERS 



woody tissue of our recent pines are marked with single series of separated 

 areolae, seldom occupying their whole breadth ; those of Pence are also 

 marked with single series of precisely similar areolae, but some of them have 

 also double series. In Pitus the areolae are always in double or triple 

 series, although still separated and usually roundish. In Pinites the areolae 

 are hexagonal, contiguous, and arranged in two or more series. Connecting 

 species will probably be found, when more attention is paid to the subject ; 

 and, in fact, a single trunk often presents appearances characteristic of two 

 genera, according to the state of its parts. Thus a Pinites regularly reti- 

 culated in its unaltered and straight cellules, becomes in some degree a 

 Pence, when the cellules are curved and distorted. 



The question as to the real nature of the areolae I leave to those whose 

 examinations of recent plants have been more extensive than mine. In the 

 fossil species they would seem to me to be rather pores than glands, al- 

 though even in them " much might be said on both sides." 



GENUS IV. ANABATHRA. 



A medullary axis ; woody tissue consisting of elongated cellules ; me- 

 dullary rays scattered at great distances. Steins roundish or compressed, 

 tapering. — Pith of irregular polygonal cellules. Woody tissue in the trans- 

 verse section presenting the appearance of regular, parallel, radiating series 

 of four-sided or subhexagonal cellules, with radiating tubular ducts inter- 

 posed at intervals. In the longitudinal sections the cellules have all their 

 walls very regularly marked with parallel transverse straight lines or ridges. 

 The medullary rays in their transverse section are of an elliptical form, and 

 composed of irregular reticulations. 



1 . A nabathra pulcherrima. 



Plate VIII. Figs. 7, 8, 9, 10, 11, 12. Plate XVI. Fig. 7. 



Found at Allenbank, in Berwickshire, in the mountain-limestone series. 



