MR. E. M. HOLMES ON MARINE ALGE FROM JAPAN. 251 
segmentis cuneatis pinnatim fissis, demum caulescentibus ; colore 
olivaceo-viridi. 
Hab. Enoshima, Ohkubo, no. 40. 
The specimens received are about 2 inches in beight and 2 inches 
in diameter, and are split longitudinally into wedge-shaped seg- 
ments which are given off in a pinnatifid manner, small fissures 
appearing in the frond which inerease iu length, as in Laminaria 
digitata, until a segment is split off; this grows iu diameter above 
the base, remaining narrow below and forming a kind of petiole. 
Although the structure of the frond resembles that of Ulva 
rigida, C. Ag., its mode of growth is ditlerent. Occasionally 
the frond is perforated in that plant, but the perforations are 
round, and never split off segments by their enlargement. 
PuxorHYcEkx. 
GLOSSOPHORA CORIACEA, D. sp. ; fronde basi stuposa, coriacea, 
decomposito-dichotoma, sinubus rotundatis, segmentis elongato- 
cuneatis margiue integerrimá, soris frondis basi sparsis. 
Hab. Enoura, Saida, no. 1. 
The plant has the habit of Dictyota dichotoma, Lamx., and 
is apparently at least a foot long when perfect. The substance 
is coriaceous, and the fronds are blackish when dry. In the 
transverse section there is an intermediate row of coloured rect- 
angular cells, between the quadrate cortical cells and the large 
internal hyaline cells, which I have not observed in D. dichotoma, 
Lamx., and which allies it to Glossophora rather than Dictyota. 
DICTYOPTERIS UNDULATA, n. sp. (Pl. VIII. fig. 1); stipite 
brevi, stuposá, fronde coriaceo-membranacea dichotoma, sinubus 
acutiusculis, segmentis patentibus margine eximie undulata, 
minute crenulata, rhachide alte stuposa, robusta. 
Hab. Misaki, Saida, no. 91. 
This species is distinguished by its small size (not exceeding in 
the specimen received 4 inches in height), robust rhachis stupose 
beyond the middle of the frond, and by the densely frilled lamina, 
which is blackish olive and of firm texture. 
PADINA ARBORESCENS, n. sp. (Pl. XII. fig. 1) ; stipite conico- 
elongata, stuposa, parce ramosá, frondibus flabellatis sparse divisis, 
epruinosis, pergameno-membranaceis, nigrescenti-olivaceis, zonis 
obscuris. 
Hab. Enoshima, Saida, no. 84. 
