369 



inerl. Ligiiitic Flora. In this, the secoudary veins are, however, more 

 obliqne and more distant. It may be a mere local variety. 

 Habitat. — Point of Rocks, Br. F. V. Rayden. 



15. Viburnum Wymperi, Heer. 



This species has been described in Dr. F. V. Hay den's report for 1873, 

 p. 382, and referred, with some doubt, to the Greenland species described 

 in Arct. Flor, (11, p. 475, PL XLVI, fig. P). The secondary veins in our 

 species are more distant and less regularly parallel. Though it may be 

 of its relation to the arctic species, the leaf of Point of Eocks does not 

 show any difference whatever from that of Black Butte. 



Habitat. — Point of Eocks, Dr. F. V. Hayden. 



16. Trapa? microphylla, sp. not'. 



Leaves small, round, or broadly oval, obtuse, rounded to a short peti- 

 ole, with borders denticulate from below the middle, three-nerved from 

 the top of the petiole, or irregularly pinnately nerved ; lateral veins at 

 an acute augle of divergence, fifteen to twenty degrees, iiexuous, with 

 dichotomous branches, all craspedodrome ; areolation by subdivision at 

 right augle, polygonal, distinct. 



These leaves vary in size from a little more than one centimeter long 

 aud uearly as broad to about two and a half centimeters long and nearly 

 two centimeters broad. They are generally oval-obtuse, somewhat en- 

 larged toward the round point; the borders are minutely dentate except 

 at and near the base, rounded to a comparatively long aud slender peti- 

 ole, the only one of the leaves where it is preserved being eighteen milli- 

 meters long, and its petiole nine millimeters. The areolation is peculiar, 

 in square or polygonal areolie, formed by close, thick nervilles, anasto- 

 luosing with veinlets parallel to the veins aud their divisions, the areola- 

 tion being clearly defined, and the parietes as thick as the veins. The 

 same kind of areolation is remarked upon the lower surface of the leaves 

 of Trcqyariatans, which, though comparable to the fossil ones by the areo- 

 lation, has its borders deeply toothed and a much thicker consistence. 

 In this species, the leaves appear membraiiaceous and as pellucid, so 

 distinctly marked in black ai)pear the nervation and the areolation 

 upon the yellowish substance of the leaves. These leaves are mixed with 

 the filaments or rootlets described with Lemnaf hullata^ and represent 

 evidently a kind of water-plant. No fossil leaves published as yet are, 

 to my knowledge, comparable to these, except those described by Pro- 

 fessor Newberry, in the Eeport of the Colorado Exploring Expedition 

 by Lieut. S. C. Ives (p. 131, PI. Ill, fig. 5), under the name of Neuropteris 

 angulata. The outline or general form of the slightly dentate leaves, the 

 pinnate uervation, and the remarkably acute angle of the secoudary 

 veins are characters common to both species; even the irregular though 

 too obscurel}^ marked division of the secondary veins seem to be of tlie 

 same kind. It may be remarked that Professor Dawson has observed 

 and described a fruit of Trapa found in connection with his Lemna scu- 

 tata; therefore, in circumstances similar to those where these leaves 

 referred to, Trapa are found. 



Habitat. — Poiut of Eocks, Dr. F. V. Hayden. 



17. Ehus membranacea, sp. nov. 



Leaves small, membranaceous, thickish, oblong, obtusely-pointed, 

 rounded or subtruncate at base, irregularly coarsely duplicato-deutate ; 

 lateral veins open, the lowest decurving to the middle nerve, craspedo- 

 drome, more or less ramified. 



Of this species, there is the point of a leaf, aud another one uearly 



