360 Marine Algce of Berivick-on-Tweed. 



LlTHOTHAMNION CALCAREUM (Ell. et Sol.) J. Ag. 



Spec. Alg. ii., p. 523. — Millepora calcarea, Ell. et Sol., 

 Zooph., p. 129, t. 23, fig. 13. 



Descr. Melobesia calcarea, Saw., Phyc. Brit. 



Fig. „ „ Harv., I.e. pi. 291. 



Syn. Spongites calcarea, Ktz., Spec. Alg., p. 699. 



Nullipora calcarea, Johnst., Brit. Lith., p. 540, t. 24, fig. 4, 5. 



Hab. Cast ashore from deep water. Holy Island. "Obtained by dredging 

 near the Fern Islands," Brady. Very rare. 



Besides those mentioned above, another species of Litho- 

 thamnion occurs at Berwick, but I have been unable to ascertain 

 to which species it belongs. It does not appear to agree in all 

 respects with any of the described species of Lithothamnia 

 known to me. Unlike Lithothamnion polymorphum, and most 

 of the other species of that genus, the colour of the fronds is 

 pink or reddish-pink and not purplish. The fronds are rather 

 thick and covered with very numerous, simple or slightly branched 

 cylindrical papillae from 3 to 5 m.m. high. At first the fronds 

 are circular and very rough with the numerous rudimentary 

 papillae, but they soon loose their circular form, and when old 

 are very irregular in outline. The conceptacles are immersed ; 

 the tetraspores appear to be two-parted. 



CORALLINA, Lamour. 

 (CORALLINE.) 



COKALLINA OFFICINALIS, Linn. 



Fauna Suecica, p. 539. 



Descr. Corallina officinalis, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 222. 



Exsicc. ,, „ Crouan,. Alg. Finist., no. 238 ; Le Jol., Alg. 



Mar. Cherb., no. 325. 

 Syn. „ „ Ktz., Spec. Alg., p. 705; J. Ag., Spec. Alg. 



n., p. 562. 

 Hab. Common in tide-pools along the whole coast. All the year. 



