130 TRANSACTIONS OF THE [jAN. 18, 



Strobilites inquirendus n, sp. 



(PL xi. fig. 1.) 



Organism irregularly annular in shape, flattened on top and bottom, about 

 1] in. in diameter laterally by f in. vertically; center wanting, about 1 in. 

 across; exterior surface deeply scarred, but shape and arrangement of scars 

 uncertain on account of distortion. 



This specimen was at first thought to represent a small cycad 

 stump in which all but the general characters had been destroyed 

 by distortion and decomposition of the vegetable tissue, which 

 is either lost entirely or largely replaced by pyrite. 



The specimen, however, is so much smaller than any cycad 

 ■stump thus far described that its reference to that famil}- was 

 thought to be too hazardous. The name adopted is meant to in- 

 dicate that it is perhaps a cone requiring further investigation. 



Aris^ma (?) DUBiA n. sp. 



(PI. xii. fig. 6.) 



Organism apparently fan-shaped or cylindrical in its original condition, 

 striate longitudinally, membranous in the broad upper portion and sides, 

 more rigid at the narrowed lower part, where there is apparently a column 

 or cylinder, from the apex and sides of which the membranous portions 

 spread. 



A somewhat similar organism is described and figured In 

 Lesquereux's Flora of the Dakota Group, p. 38, pi. xlvi. fig. I, 

 under the name Arisaema cretacea sp. nov., but the affiliation of 

 either with the Aracese is very problematic and it might perhaps 

 equally well be referred to the spadix of a cycad. Its frag- 

 mentary condition renders any rigid determination inadvisable. 



Aris^ma (?) Mattewanense n. sp. 

 (PI. xii. fig. 7.) 



Fruit ovoid, IS in. long by 1} in. broad ; surface roughened with tuber- 

 culous excrescences of ill-defined shape ; internal structure not preserved. 



It was at first thought that this organism might be a fruit of 

 some g3'mnosperm, but the entire absence of woody tissue 

 seemed to indicate a fruit of softer consistency, such as Symplo- 

 carpus, Arisaevia, etc., and the genus adopted for the previous 

 specimen was finally decided upon for this one, largely for the 

 sake of consistency. 



Salix Meekii Newb. 

 (PI. xiii. figs. 3, 4.) 

 Salix Meekii Newb. Notes on the Later Extinct Floras, etc., 



