studies in Problematic Organisms. 75 



proper designation should be A. al/c^/iiniitfisis.'-'^ In January, 



1832, the same writer"!' described a second species under the 

 name of /''. brotigniartii {yo\\\ a sandstone beneath the "coal 

 formation," occurring in the western part of New York. This 

 is the same species as that described by him previously. In 



1833, Mantell+ described Fmoidcs brongniartii, not knowing 

 of the previous use of the name. This is a very different 

 species from that described by Harlan, and seems to be part 

 of the frond of a fern. Its specific designation will probably 

 not have to be changed, as it does not belong to the genus 

 Fucoides. In 1835, Aug. von Gutbier|| described the following 

 species, most of which are of real vegetable origin : 



F. filiciformis. F. crispus. 



radians. crenatus. 



filiformis. dentatus. 



linearis. 

 Of these F. crenaiics is a problematical form ; F. dentatiis% 

 is now Rhacophyllum flabellatum. In 1835, Hitchcock^ de- 

 scribed Fucoides shepardi as a sea-weed which penetrated the 

 rocks perpendicularly. This is now known as ScoIitJms 

 shepardi. ^'^^^ In 1837, Messrs. Lindley and Hutton described 

 and illustrated Fucoides arcuatiis.^'\ This is doubtless a worm 

 burrow, similar in aspect to F. antiquus, and may be the same. 

 In the same year, Hisingert+ described a variety of F. ajitiquus 

 under the name of var. gracilior. This is also a problematic 

 organism and scarcely diflFers from F. antiquus. 



In 1838 appeared the second volume of Sternberg's work,|||| 

 the first volume of which had been printed in 1825. Here 

 we find Brongniart's genus broken up into various genera, 



*This subject has been thoroughly investigated by the author, and the details 

 are given in another paper, not yet published. It was, however, read before the 

 .\nierican Association for the Advancement of Science, at Madison, in August, 1893. 



tHarlan, R. Monthly Am. Jour. Geol. and Nat. Sci., vol. i, pp. 307-308. 



JGeology of the Southeast of England. London, 1833, pp. 95-96. 



IIAbdrucke und versteinerungun des zwickauer Schwarzkohlengebirges und 

 seiner umbebungen. Zwickau, pp. 36, pi. 11. 



^Brongniart had used this name in 1S28. 



HRept. on Geol. Min. Bot , and Zool. of Mass., 2d ed., p. 236. 



'"■James, J. F. Bull. Geol. Soc. Am., vol. iii, 1891, p. 32. 



tfPossil Flora of Great Britain, vol. iii, p. 93, pi. 185. 



ItLethaea svecica. Holmiae, 1837, p. 106. Supple., 1S40, p. 2. 



IlilVersuch einer geognostisch-botanischen darstelluug der flora der vorwelt. 

 Prag, 1S38. Folio. 



