NOTES ON NEMATOPHYTON CRASSUM. 

 HV 



D. p. Pknhaij.ow. B. Sc, K. R. S. C, 



AfcCill ( 'nivrrsily, Montreal. 

 (Wit)i I'lalcK w-wiii.) 



In a former paper* I had Mm; occasion to (Icscribc (-(Mtaiii fossils from 

 tlic middle Eriaii <^)f Now York, and rct'oned tlieni t(» Xeinatojphytoii cras- 

 sinu. Pen., Mltiioii^li orij^inally described by Sir William Dawson under 

 tlie name of ( 'elluloxi/lon prinKcvum. This transfer was based upon in- 

 dii-ect evidence and was regarded by me as requiring confirmation. 

 It was, tlu'refore, a matter of spej-iai con^ratnlation when, during; the 

 past winter, fresh material was ida<'ed in my hands, which seemed to 

 substantiate the correctness of my orij^inal determination. 



In January last (1892) Prof. F. II. Knowlton, of the U. S. National 

 Mnseuni, informed me that new specimens of N'. craHnnm {Celluloxi/lou) 

 had l)een found in New York, and later tiansmitted three slides of sec- 

 ti(»ns, toj^ether with the stem from which they were taken, and also a 

 slide of tiie type s]»e(*imen of CcUnloxylon. This latter was, there- 

 f(»re, from the same specimens as those originally described by me and 

 upon which Sir William Dawson based the genus of that name. Addi- 

 ticnial (;(»mn)ents ui>on this are not <*alled for at this time, but reference 

 should ])e made to my former description of its strncture. 



The other specim(ius forwarded by Prof. Knowlton were collected 

 by Mr. C. S. Prossei', of the U. S. (leological Survey, from the Cooley 

 (^)uarry on tlui southern extn;mity of Skunnemuidc Mountain, Orange 

 County, New York. According to information recei\('d from Mr. Pros- 

 ser the hoiizon is to l)e regarded as in all probability middle Erian. It 

 agrees, therefore, in its position, with th^it of CeUKloxyhm, which was 

 ol)tained from the Ilamilton (Jroup in Hopewell, near Canandaigua. 



The flection of stem measures about 3 inches in dianu'fer and shows 

 no external evidence of stiucture beyond a band of ])roininent, longitu- 

 diiuil stria* on one side, and detached masses of carbonaceous matter 

 on the opposite side. From this specimen three slices were cut in such 

 a manner as to represent as nearly as possible the three usual direc- 

 tions of section. I shall, therefore, distinguish them by tlie usual 

 terms. 



* Trans Royal Soc, Can., vii. iv, 23. 



ri-()(i.'(Mliii;;,s Xntiiiijal Museum, Vol. XVI, No, 92'J. 



115 



