V. HELMINTH OCLADE/E. 135 



1. Nemalion multijidum, J. Ag. ; frond dichotoinous, with rounded axils. J. Ag. 

 Sp. Alg. vol. 2, p. 419. Harv. Phjc. Brit. t. 36. Kiitz. Sp. Ahj. p. 712. (Tab. 

 XXIX. C.) 



Hab. Bangor, Maine, Mr. Hooper. Newport, Prof. Baih'y. Narragansett Pier, 

 Mr. Olney. Providence, Mr. Girard, Mr. TInirber. Portland, Capt. Pike. Little 

 Compton, Mr. Geo. Hunt. (v. v.) 



Fronds six to ten inches long, as thick as crow's quills or thicker, worm-like, 

 distantly forked, either regularly dichotonious or sub-palmate, the lesser branches 

 frequently terminating in four or five finger-like lobes. Axils rounded. Apices 

 very obtuse. Substance very elastic, firm. In drying, it shrinks very much, and 

 closely adheres to paper. It is of a dull brownish pur[)le colour. 



Plate XXIX. C. Fig. 1. Nemalion nndfifulum, the natural size. Fig. 2, cross 

 section of the frond ; Jig. 3, peripheric filaments ; jig. 4, nucleus separated ; the 

 latter figures magnified. 



2. Nemalion virens, J. Ag. ; " frond compressed, gelatinous, horny when dry, 

 short, repeatedly forked, by degrees attenuated." J. Ag. Sp. Alg. vol. 2, j9. 420. 



Hab. Pacific coasts of the Mexican Eepublic, Liehman. 



" Frond as thick as a pigeon's quill, three inches long, below whitish with a yel- 

 lowish tinge, green above ; when dry cartilaginous." 



III. SCINAIA. Bivona. 



(Ginannia, Montague.) 



Frond terete or compressed, dichotomous, gciatinoso-membranaceous, filled with 

 fluid gelatine, traversed by a fibrous axis from which slender, dichotomous, hori- 

 zontal filaments radiate towards the membranous periphery which is formed of a 

 thin layer of roundish-angular cells. Sporiferous nuclei suspended within the mem- 

 branous walls of the frond, splierical, (invested with a very thin membranous peri- 

 carp ?) composed of innumerable, branching, fastigiate, articulated spore-threads 

 radiating from a central point, and bearing pyriform spores. Tetrasporcs unknown. 



The frond in the typical species is rosy red, dichotomously branched and fasti- 



