ENTEROMORPHA. 215 



7. E. ramulosa } Sm. ; frond compressed, highly reticulated, 

 very much branched and interwoven, twisted, everywhere co- 

 vered with spine-like branchlets. Harv. Pkyc. Brit. t. ccxlv.; 

 Grev. Alg. Brit. p. 181 ; Hook. 1. c. p. 315 ; E. Boi. t. 2137. 

 E. clathrata, y. Grev. I. c. E. ramulosa, var. minor, Wyatt, 

 Alg. Damn. No. 208. 



On rocks between tide-marks. Annual. Spring. Not uncommon. 

 " Fronds 5 or 6 inches to 1 or 2 feet long, half a line in diameter, com- 

 pressed, curled and twisted, much and repeatedly branched, and interwoven 

 into a (more or less) thick and inextricable mat, and beset on all sides with 

 short, spine-like branchlets, or rather apiculi, which render it harsh to the 

 touch. Substance membranaceous, green. This species can be at once 

 distinguished from E. clathrata, with which alone there is any risk of its 

 being confounded, by mere handling, the one feeling harsh to the touch, 

 the other soft and silky." Carm. MSS. 



8. E. Hopkirkii, M'Calla ; frond excessively slender and 

 byssoid, flaccid, very much branched ; branches feathery, de- 

 compound, erect, attenuated, set with minute, subulate ra- 

 muli ; cellules large, hyaline, each cell containing one or two 

 minute grains of colouring matter; the ramuli composed 

 of a single series of such cells. Harv. Phyc. Brit. t. 

 cclxiii. 



Dredged in 4 10 fathom water. Annual. Summer and autumn. Good- 

 rington, Torbay, Mrs. Griffiths (1838). Carrickfergus, Mr. M'Calla (1845). 

 Fronds 6 12 inches long or more, exceedingly slender, the main stems 

 scarcely the diameter of human hair, the branches and ramuli more deli- 

 cate. The cells of which the frond is composed are of large size, about 

 three or four making the breadth of a branch, hyaline, with a minute grain 

 of endochrome in the centre ; the ramuli are 'composed of a single string of 

 such cells. The species has been named by Mr. M'Calla in honor of the 

 author of the ' Flora Gloltiana : ' the discovery is, however, due to Mrs. 

 Griffiths, from whom I have specimens of the date above given. 



9. E. percursa, Ag. ; frond capillary, simple, or having a 

 few short, spine-like ramuli, nearly solid, laxly reticulated ; 

 the cells large, hyaline, (2 to 4 in the breadth of the frond) ; 

 each cell containing a brilliant green grain of colouring mat- 

 ter. Hook. Br. Fl. vol. ii. p. 315 ; Harv. Man. Ed. i. p. 

 176 ; Harv. Phyc. Brit. t. cclxxxii. 



On the oozy sea-shore, above half tide level, spreading widely. Annual. 

 Summer. Appin, Capt. Carmichael. Bangor, N. Wales, Mr. Ralfs. 

 Larne, Mr. D. Moore. Fronds several inches long, as fine as human hair, 

 decumbent, forming widely spreading, entangled strata. 



