Ser. CHLOROSPERMEA. Fam. Ulvacea. 
Pruate CCCLII. 
ENTEROMORPHA PERCURSA, Zoos. 
Gey. Car. Frond tubular, membranaceous, of a green colour and reti- 
culated structure. ructification: granules, commonly in fours, 
contained in the cells of the frond. Enreromorrna (Lin/),—from 
evrepov, an entrail, and popdn, form or appearance. 
Enteromorrua percursa; frond capillary, entangled and variously twisted, 
simple or having a few short spine-lke ramuli, compressed, solid (?), 
reticulated ; cells quadrate, two or more (generally two) in the 
breadth of the frond, the endochrome nearly filling the cell. 
EntERomMoRPHA percursa, Hook. Br. Fl. vol. ii. p. 315. Harv. Man. ed. 1. 
p- 176. (not ed. 2. p, 215, where the specific character applies to KE. Ralfsit, 
Harv. Phyc. Br. t. CCLXXX11.) 
SoLENta percursa, 4g. Syst. p. 187. 
ScyTosIPHON compressus, y confervoideus, Lyngb. Hyd. Dan. p. 65. t. 15. 
f. B. 4-6. 
Has. Muddy sea-shores, at half-tide level. Annual. Spring and summer. 
Appin, Capt. Carmichael. Larne, Mr. D. Moore. Clontarf, Miss 
Ball ('). Tor Abbey, Mrs. Griffiths (mixed with Lyngbya Carmi- 
chaelii, &e.) 
Grocer. Distr. Shores of Northern Europe. 
Descr. Fronds decumbent, several inches in length, forming widely spreading, 
entangled strata; each separate frond variously curled and twisted, and 
ordinarily of the diameter of human hair. Such fronds are usually quite 
simple, and formed of a double row of quadrate cells, filled with endo- 
chrome, with hyaline borders to each cell; thus the filament appears to be 
traversed by a colourless central line. Mixed with these characteristic 
threads are others of twice or four times the diameter, formed of a larger 
number of rows of cells; and these filaments, which have much the aspect 
of young plants of /. compressa, are frequently furnished with short, or 
long, simple branches, formed, like the ordinary threads, of a double row 
of cells. I have not been able (in dried specimens) to find any cavity 
traversing the filament, as is usual in the genus. The cells composing the 
filaments are nearly filled with green matter, leaving narrow borders. The 
colour is a brilliant grass-green, which is generally well preserved in drying ; 
and the substance is membranaceous, and rather soft. 
At Plate CCLXXXII. I have already given, under the name 
F. Ralfsit, a representation of an Hnteromorpha communicated 
