[I'KNUAU.ow] NOUTII A^.KHICAN SI'KCIES oK I>AI)()XYLON 67 



lliey also show bordered pita in section. One tangential section shows 

 very cltiarly, either a resin canal or a series of resin cell^? — probably the 

 latter. l-Yom these d aa the following diagnosis may ijo obtained : — 



Transverse. — Growth i Ings obscure or entirely wanting. The trachelds about 

 41 X 49 mlc. broad, their walls 12.5 nilc. thick. 



Radial. — Bordered pita numerous throughout the trachelds, In 2-3, more rarely 

 In 4 rows. The elements of the medullary rays of two kinds; the 

 parenchyma cells thln-walled and devoid of pits, about equal to 3 

 trachelds; the ray trachelds long. Interspersed and bearing on their 

 lateral, upper and lower walla, numerous crowded, bordered pits. 



Tanyential.—Ra.ya very variable, commonly 1-serlate but sometimes 2 seriate 

 in part; the trachelds usually distinguished by their narrow form 

 and pitted walls. 



(.'oifDAiTKs ()i-AN(;()Ni)iA\r.\r, Dn. 



Bib. :— Proc. U. S. Nat. iviua., XII., 606; Brit. Mua., 1886, 237; Goppert, Nachtr. 

 z. Kennt. d. Conlf. d. Pal. Form., 1888, 9; Can. Nat., VI., 165; Jn'l Geol. 

 Soc, XVIII., 306; Acad. Geol., 3d ed., 1878, 534; Dana, Man. Geol., 

 1875, 271; Pre-Carb. Fl. of N. D., Maine #nd E. Can., Can. Nat., 1861, 

 VI.. 165-166; Quart. Jn'l Geol. Soc. 1862. 306; Zittell. Schimper & 

 Schenk, Handb. der Pal., 1890, 865; Foss. PI. of the Dev. & U. Sll. 

 in Can., 1871. 12. 



Dlst.— Middloi Devonian of New Brunswick. 



The original description of this species, which has been copied by 

 subsequent authorities without (lucstion or verification, was contained in 

 the account of tlio Pro-('ari)oniferous Hora of New Brunswick, Maine 

 and Eastern Canada published in 18G1.* In the light of more recent 

 studies, this description is found to contain several marked errors whicli 

 probably resulted from the nature of the material employed. Our om\ 

 studies show th'at the transverse section displays no essential divergence 

 from the characters common to the genus as a whole. There is no 

 evidence of growth rings suoli as form a prominent feature of the orig- 

 inal description. At intervals in the section, the structure which has 

 been neatly influenced by decay, has been so far 'altered by pressure as 

 to lorm irregular lines of ctmipressed traeheids which have been forced 

 over to one side in the process, as is not unconunon in fossil woods. Then' 

 has thus been developed a semblance of growth rings, and this is what 

 the original description refers to. A criticial examination of these areas, 

 however, does not fail to disclose the true condition which is also sug- 

 gested by the very iiTCgular disposition, as also by other features pre- 

 sented. 



• Can. Nat., VI., 165-166. 



