4 Evans : HEPATICAE OF PUERTO Rico 
vegetatively by means of leafy propagula which are similar to 
those of Leptolejeunea. 
In the present paper only those species are described of which 
specimens from Puerto Rico have been personally examined, but 
a few critical notes are interpolated regarding 1). hamatifolia and 
D. tenuis. The writer would express his thanks to Mr. Matthew B. 
Slater, of Molton, Yorkshire, who has kindly loaned him for study 
the various species of Drepanolejeunea described by Spruce, and 
also to Herr Stephani, of Leipzig, who has confirmed several deter- 
minations. 
Drepanolejeunea biocellata sp. nov. 
Yellowish- or brownish-green, growing in thin irregular patches ; 
stems 0.04 mm. in diameter, closely adherent to substratum, irregu- 
larly pinnate, the branches widely spreading: leaves distant to 
slightly imbricated, the lobe suberect to obliquely spreading, more 
or less convex, often deflexed at the apex, ovate, distinctly nar- 
rowed toward the base, 0.35 mm. long, 0.2 mm. wide, attached 
by a short oblique line of insertion, straight or slightly falcate, 
margin entire or more or less denticulate from projecting cells, 
sometimes with an indistinct angular tooth near end of keel, anti- 
cal margin arched, postical margin straight or nearly so, apex ob- 
tuse to acute, usually tipped with a single cell, rarely with two 
cells in a row; lobule ovate, 0.14 mm. long, 0.09 mm. wide, in- 
flated throughout or plane at apex and along part of free margin, 
keel arched, roughened near end from projecting cells, free mar- 
gin sometimes plane and appressed to lobe but usually involute 
to beyond apex then passing by a lunulate sinus to end of keel, 
apical tooth strongly curved; cells of lobe plane or slightly con- 
vex, averaging 15 # at the margin and 18x 15 yu in the median and 
basal regions, walls more or less thickened, trigones and inter- 
mediate thickenings sometimes distinct, sometimes confluent and 
indistinct ; ocelli commonly two, one in lower half of lobe, the 
other (sometimes obsolete) at or near the base, a little larger than 
the surrounding cells, measuring 27x 18: underleaves distant, 
basal portion rectangular or trapezoidal, 0.05 mm. long, 0.045 mm. 
wide at base, marginal cells six, scarcely bulging, divisions widely 
spreading, consisting of two or three cells in a single row, with a 
spread of 0.1 mm.: inflorescence dioicous: 9 inflorescence on a 
short branch, innovating on one side with a short and simple inno- 
vation ; bracts obliquely spreading, complicate, unequally bifid, 
the lobe ovate-lanceolate, 0.35 mm. long, 0.15 mm. wide, acute, 
margin entire or irregularly and vaguely crenulate, lobule oblong, 
0.2 mm. long, 0.09 mm. wide, truncate to bluntly pointed, entire ; 
