THE JURASSIC FLORA OF CAPE LISBUKNE, ALASKA. 51 



some 7 or 8 centimeters in Jengtli when li\'inij. The base is phiinly lieurt-shaped, with the 

 upper side slightly the longer and ajiparently a little overlapxnng the rachis; the point of attach- 

 ment is approximately in the center of the leaflet. The margins of the leaflet are comj^letely 

 preserved only near the base, but so far as can be made out little narrowing is apparent. The 

 nervation all arises at the point of attachment and thence ra(hates out with occasional forking 

 to accommodate the enlarged area reached. 



The type locahty for Otozamites giganteus is Kamenka, in tlie district of Izium, in beds of 

 Bathonian age ( = upper part of iliddle Jurassic or Brown Jura), and until the present record 

 the species had not been found elsewhere. 



Zamites meoaphyllus (Phillips) Seward. 



Plate VII, figure 1. 



Zamites megaphyllus (Phillips) Seward, .Jurassic flora, pt. 2. PI, X, figs. 4. 5; PI. XI I, fit.'s. 1. :i-.'i, 1904. 



ralst'ozamid nugaphijUa Phillips, Geology of Oxford, p. 169, Diag, XXX, fig. (i, 1871. 



Irites alashaiia Lesquereux, U. S. Nat. Mus. Proc, vol. 10, p. 36, 1887. 



Baiera palmata Heer, Lesquereux, idem, vol. 11, p. 31, PI. XVI, flgs. 4, .i, 1888. 



Nageiopsis longi/olia Fontaine, in Ward, U. S. Geol. Survey Men. 48, p. 171. PI. XLV, figs. 1-5, 1905. 



Podozamites grandifoiius Fontaine?, idem, p. 167, PI. XLIV, fig, 1. 



Leaflets coriaceous in te.xture, long, narrow, strap-shaped, slightly falcate, abruptly rounded 

 at base, narrowed from or below the middle to a long, slenderly acuminate apex: margin 

 perfectly entu'e: attachment unknown but probably sessile by the narrowed ])ase; nerves dis- 

 tinct, parallel, not forking unless at base (which has not been clearly seen), 20 or 25 in number, 

 each separated by about 10 thin, very delicate intermediate veins. 



This species is represented by nearly twenty examples, none of which is absolutely com- 

 plete, as all lack the e.xtreme base showing the point of attachment. The character of the 

 extreme tip, however, is well shown in several specimens. The ma.ximum length observed is 

 about 18 centimeters and the width 2.5 to nearly .3 centimeters. At least two of the specimens 

 show that the base is becoming rounded to the pomt of attachment, but unfortunately none is 

 quite clear at this place. The character of the nerves, both the larger and the fine intermediate 

 ones, Is plainly discernible in most of the specimens; they are fully described above. 



It was at first my mtention to describe this as a new species of Zamites, but on further 

 consideration I found it impossible to distinguish the form from Zamites megaphyllus (Phillips), 

 as described and figured by Seward ' from the Great Oolite (Bathonian) of Stonesfield, England. 

 Although Seward states that the English material consists almost entu-ely of detached leaflets, 

 he was enabled to give the following diagnosis: 



Frond pinnate, pinnae attached to the rachis at a wide angle, reaching a length of more than 30 centimeters and 

 a breadth of over 3 centimeters; linear in form, attached by a slightly contracted concave basal surface, which is 

 somewhat thickened: the lamina tapers gradually to an elongated acuminate apex, frequently falcate near the tip. 

 Veins numerous and parallel, converging slightly toward the base and apex of the pinnse. 



This diagnosis, it will be obsisrved, agrees absolutely with that drawn from the Alaska 

 specimens. In the largest example figured by Seward,- which was 4 centimeters wide, the 

 "lamma is traversed by inimerous parallel veins between which, as shown in the drawing, 

 occur fuier longitudinal lines." In this particular, therefore, the specimens from Cape Lisburne 

 agree with tlie English species and apparently there can be no doubt as to their being correctly 

 referred to it. 



There has been much tmcertainty as to the generic reference for these fine leaflets. The 

 first examples of this form were obtained at the C'orwin mine, in the Cape Lisl)urne region, 

 about 1885, by Henry D. Woolfe. These were studied by Lesquereux, who named them 

 Ifites alasl-ana on account of their presimied resemblance to leaves of the living Iris. He 

 described them as follows: "Leaves thicklsh, luiear-lanceolato, tubuloso at apex, narrowed to 

 the base, falcate, equinerved; median nerve obsolete; the lateral broad, eqinil." He also adds 

 that the "nerves are about 1 miUimeter in width [apart], not very prominent, equal, not 



' Seward, A, C, Juriissio rtora, pt. 2, p. Ill, liXM. 2 Idem, I'l. X, flK. 1. 



