292 Marine Algce of Berwick-on- Tweed. 



A small and rare species forming minute hemispherical tufts, 

 scarcely larger than a pin's head, on the thongs of Himanihalia 

 lorea. From the ovoid, colourless, subdichotomous cells of the 

 solid tubercle two sorts of filaments arise ; the one coloured, 

 distinctly incurved, attenuated to th« base, obtuse at the apex, 

 with joints twice as long as broad below, nearly square above ; 

 the other, colourless, straight, much longer than the coloured 

 filaments, with articulations three or four times as long as broad. 

 The clavate sporangia are attached at the base of the incurved 

 coloured filaments. 



LEATHESIA, Gray. 



Leatiiesia difformis (Linn.) Aresch. 



Alg. Scand. ser. nov. 214.— Tremella difformis, Linn., Syst. 

 Nat., p. 714. 

 Descr. Leatiiesia tuberiformis, Harv., Phyc. Brit. 

 Fig. „ „ Sarv., I.e. pi. 324 



Ersicc. ,, ,, Le JoL, Alg. Mar. Cherb., no. 56. 



Corynephora marina, Wyatt, Alg. Danm., no. 149. 

 Leathesia marina, Crouan, Alg. Mar. Finist., no. 48. 

 Syn. „ ,, /. Ag., Spec. Alg. i., p. 52; Ktz., Spec. Alg., 



p. 543. 

 Leatiiesia tuberiformis, Gray, in Phyc. Brit ; Thuret, in Ann. des 



Sciences, Ser. 3, vol. xiv., PL 26, figs. 5-12. 

 Leatiiesia difformis, Farlow, Mar. Alg. New Bng., p. 82, PI. v., 



fig. 1. 

 Cluetop bora marina, Grev., Crypt. Fl., p. 53; Lyngb. Hydr. Dan., 

 p. 193, t. 66 ; Johnston, Fl. Berwk. n., p. 260. 

 Hub. Common on Algse and sand-covered rocks from half-tide level to 

 low-watermark. May — Oct.- Berwick Bay, Burnmonth, Holy 

 Island, and elsewhere along the coast. 



TitiBE II.— EUCHORD A RIEA\ 



CHOEDAEIA, Ag. 



Chordaria flagelliformis (Fl. Dan.) Ag. 



Syn.. p. 12.— Fucus flagelliformis, Fl. Dan., t. 650. 

 Descr. Chordaria flagelliformis, ffarv., Phyc. Brit. 



Fig. „ ,, Sarv., I.e. pi. Ill; Farlow, Mar. Alg. New 



Eng., pi. v., fig. 2. 



