124 FLORA OF LOWER COAL MEASURES OF MISSOURI. 



1870. CaMpteridimn SiiUivantl (Lx.) Weiss, Zeitschr. d. deutsch. geol. Gesell., vol. 



xxii, p. S7C, pi. xxi, figs. 1-3. 

 1880. Callipteridium Sullivantii (Lx.) Weiss, Lesquereux, Coal Flora, vol. i, p. 1(;4. 

 1883. GalUpteridmm SnUivantii (Lx.) Weiss, Lesquereux, 13th Rept. Geol. Surv. 



ludiaua, p. 210, pi. xii, fig. 1. 

 1889. CaUipteridiiim Sullivanti (Lx.) Weiss, Miller, N. Amer. Geol. Pal., p. Ill, fig. 22. 

 1889. GaUipteridium Sullivanti (Lx.) Weiss, Lesley, Diet. Foss. Pennsylvania, vol. 



1, p. 107, text fig. 

 1899. GaUipteridium Sullivantii (Lx.) Weiss, 1). Wliite, 19tb Ann. Rept. U. S. Geol. 



Surv., pt. 3, p. 501. 



In the specimens that I have seen of this peculiar species the pinnules 

 are generally rather less narrow, proportionately, near the base than in 

 those figured in the early Pennsylvania and Illinois geological reports. The 

 rachises and the midribs of the full-sized pinnules are both finely striated, 

 the midi-ibs being very slender in the immature pinnules. None of the 

 examples before me show the midrib terminating very abruptly. The 

 lateral nerves are fine, not very close, and occasionally they fork a third 

 time in arching to the margin. 



As a rule the lowest pimiules at the base of pinnpe of all orders are 

 contracted at the base so as to bear considerable resemblance to Neuropteris 

 in form as well as in nervation, thus conforming apparently to the requisite 

 characters of the genus Neurodontopteris of Potonie.^ This similarity of the 

 two genera, seen in Figs. 1, 2, PI. XLI, is still more marked in the specimen 

 shown in Fig. 1, PL XXXIX, and in the Callipteridium neuropteroides Lx., 

 illustrated in fig. 3, pi. xxvii, of the Coal Flora. 



Our species exhibits, in habit and superficial appearance, a great simi- 

 larity to the JDanmtes Emersoni Lx., the apparently Marattiaceous fruiting 

 of which seems to be quite in conformity with the supposed relation of the 

 NeiiropteridecB to the Marattiacea. 



The Odontopteroid aspect of CaUipteridium Sullivantii Lx., which led 

 Weiss, in his studies of Odontopteris, to associate it with the latter, is well 

 shown in a phase illustrated in PI. XLI, Fig. 1, of two pinnse, belonging 

 apparently to a secondary rachis, which are in outline especially suggestive 

 of Odontopteris genuina Gr 'Eury, or 0. ohtusiloha Naum. The reference of 

 the species by Weiss to CaUipteridium was made apparently on account 

 of the form and ner\'ation of the upper pinnse. It seems as a whole to be 



Klora Rothliegenden v. Thiiriugeu, 1893, ji. 124. 



