[i'ENiui.i.<>«] NOHTII AM',i;i('A.\ SI'KCIKS OF I)ArM»XYU)N 71 



CoaUAITKS OIUOKNSE. Dn., n. ^p. 

 Fig. 15. 



All undescribed species from New Lisbon, Ohio. 



7'raHsiTm'.— Trachelds 47 x 56 mlc. broad, the walls 12.5 mic. thick. 



I{(ulial.~Ray cells chiefly short, about equal to two trachelds, straight or 

 somewhat abruptly contracted at the ends; the pits on the lateral 

 walls oval, with a prominent border, apparently 2 per tnicheid, but 

 not exactly determinable on account of extended decay. 



Bordered pits In 3-4 rows, sometimes 2 rows throughout the 

 tracheld, hexagonal, about 12.5 mlc. broad. 



Tangrntial.—Raya numerous, upwards of 25 cells high; broad, about 41 mlc, 

 conspicuously squarish, 1 or often 2-3 seriate in part. 



CoitDAITKS MATHiniDi;, Dn., li. sp. 



Dlst. :~Doug]as Miie, Grand Lake, and Mirimichl, W.B.; Port Hood and 

 Mabon, C.B.; Jogglns, N.S. 



This is an unpublislied species onibodietl in .Sir William Dawson's 

 notes. The description there giv.'n places particidar stress u])on the 

 thinner walls of the tracheids — a condition in reality residting from »ul- 

 vanced decay— and the greater number of rows of bordered pits. This 

 latter, together with the nunil)er of pits on the lateral walls of the ray 

 cells, really constitutes tlie point of differentiation from C. muteriaritmi, 

 and seems to constitute this a valid species. 



rransffrsc— Trachelds about 56x56 mlc. broad, the walls 12.5 mic. thick. 

 Scattering tracheids contain resin. 



Radial. —Ray cells straight or somewhat contracted at the ends; the pits on 

 the lateral walls oval, narrowly bordered. 1-8, chiefly 2-3 per 

 tracheld; the lenticular or oblong orifice nearly equal to the dia- 

 meter of the pit. 



Bordered pits hexagonal, in 1-3, chiefly 2 rows. 



Tangential.— Rays uniseriate or sometimes 2-8eriate in part, upwards of 35 

 cells high; the oval or round cells 25-31 mlc. broad. 



CORDAITES ILLTNOISEXSE, Dn., n. .sp. 



An unpublished species from the coal measures of Rock Island, 

 Illinois, and from the coal measures of Boonsboro, Iowa (?), the latter 

 being designated in the collection of Sir William Dawson under the pro- 

 visional name of D. . missouriense. A third specimen appears in the 



