458 
_ Laruyrus Mexicanus Schl. Linnea, 12: Litb. 85 (1838). 
«LL. glaucescens, cirrhis diphyllis, foliolis lineari-lanceolatis 
oblongisve obtusis mucronatis trinerviis, pedunculis unifloris,. folio 
longioribus, leguminibus compressis polyspermis. In tepid. 4. 
Accepimus semen cum adnotatione: ‘Lathyri species e Mexico. 
Flores amcene purpurei, magnitudine L. odorati. Vereor tamen, 
ne L. tingitanus, cultura mutatus sit.”—Schlechtendal. 
«South Mexico, valley of Mexico (Bourgeau, 85) Herb. Kew. 
This is probably L. ¢ingitanus L.,an Old World species now widely 
diffused as an escape from cultivation.’”——Hemsley, Bot. Cent. 
Amer. 1: 293. 
Type not seen by the writer. 
Latuyrus cincrus S. Wats. Proc. Am. Acad. 23: 263 (1888) . 
is Vicia gigantea Hook. Fl. Bor. Am. 1: 157 (1830) as noted on 
type specimens in Gray. Herb. é: | 
A new fossil Hepatic from the Lower Yellowstone in Montana. 
By F. H. KNow Ton. 
[PLATE 219.] 
PREISSITES WARDII n. gen. et sp. 
Thallus large, from 8-15 mm. long, and about 6 mm. broad, 
entire, or more commonly once or twice forked, provided with ' 
distinct midrib which forks with the forking of the thallus, a0 
along the sides of which are numerous vein-like lines cause Y 
the overlapping scales of the lower surface; fruit unknown. 
Hepatice in a fossil state are exceedingly rare, and ne 
species here described represents, so far as I am now Awan’ = 
only extinct form known from North America. According » 
Mr. Arthur Hollick, of Columbia College, beautifully prese?™ 
specimens of the living Marchantia polymorpha, have bec a 
in calcarious tufa, but there is every reason to suppose ne sae 
are of very recent origin. i of 
In Europe, outside of a dozen more or less doubtful spee 
Jungermanniacee preserved in the Baltic amber, only 5* fos- 
sil species appear to have been thus far described: “siete 
Sezanensis Sap. closely allied to the living JJ. polymorp - 
1 Fl. Foss. de Sez. 308, pf. 7, figs. 1-8. 
