W. M. Davis— Triassic Trap Rods. 345 



ris, are entirely different in their habit of growth, and also very 

 much larger. 



In this connection I may mention that in specimens from the 

 Chemung shales of New York, recently obtained from Professor 

 Wi hams, I have found plants which may be referred to Rhodea. 

 They are slender delicately striated or smooth petioles, giving 

 off pinnate divisions, wind uliimateh hi furcate frequently and 

 appear to terminate in flat blade-like or cuneate leaves or fronds. 

 They are the same objects which I described, from fragmentary 

 specimens obtained from Professor Hall, o&Riiachiopteri* \>in naia, 

 in my paper on Devonian plants, in the Journal of the Geolog- 

 ical Society of London, vol. xviii. In a note on Professor 

 Williams' plants, presented last year to the American Associa- 

 tion for the Advancement of Science, I have described these 

 specimens and have suggested the name Rhodea pinnata for 

 them. They may be defined to be stems bearing slender 

 opposite branches" in a decussate manner, the branches again 

 dividing in a dichotomous or pinnate iii.mIl'. and terminating in 

 small cuneate or linear leaves. The fructification of these 

 plants I have not seen, but they arc in apn< arance and habit of 

 growth altogether distinct from Psihphyton. I may also ob- 

 serve here that the stems of Psilophyton are much more woody, 

 and in their round central sea lari form axis, present much more 

 of structural affinity to Lycopods than to Ferns. 



Art. XXXV II L — Bra-f Notice of Observations on the Triassic 

 Trap Rucks o, Massachusetts, ( '<,,,>,>.> ctioa 'and X<w Jersey ; by 

 W. M. Davis. 



During the past summer I have examined the Triassic trap 

 ro< U 11, Ma-udius, tts., Connecticut and New Jersey at a num- 

 ber of points where they are shown in characteristic develop- 

 ment. The detailed statement of these observations will soon 

 be published in the Bulletin of the Museum of Comparative 

 til ridge, with full reference to previous work; in 



sages of supply for the trap sheets : second, i 

 often of great extent and thickness, lying in m 

 formably between the layers of stratified rock- 

 flow sheets poured out during the formation 





stent equal 1 

 opographic effects. 



