Boone, Marine Algae, Cruise of "Alva" 25 



in each lobe of the articulation, half or more immersed in the 

 upper portion of the lateral lobes, the conceptacle aperture being 

 flush with the upper margin of the lobe and circular in contour. 

 Each conceptacle contains a tuft of four- jointed spore threads. 

 When decalcified, the articulations show an exquisite design of 

 alternate bands, composed respectively of roundish and of linear 

 cells. 



The variation in the articulations is well shown in the artist's 

 sketch (figure 1, of the distal portion of a branch.) 



References : CoralUna sagittata, Lamouroux, J. V. F., in Frey- 

 cinet, L. de, Voy. de L'Uranie et Physicienne Zool. (Quoy, J., 

 et Gaimard, P., t. Ill, s. Ill, p. 625 ; Zool. Atlas, pi. 95, figs. 

 11, 12. 



Amphiroa sagittata, Decaisne, J., Ann. Sci. Nat., 1842, p. 359. — 

 Harvey, W. H., Nereis Australis, London, 1848-49, pi. I, p. 

 102. 



Cheilosporum sagittatum, Areshoug, J. E., in Agardh, J. G., 

 Spec, Gen. et Ord., Algarum, vol. Ill, 1851-52, p. 545. — 

 Harvey, W. H., Alg. Austral. Exsic. No. 445; Phycol. Aus- 

 tralica, vol. V, 1863, pi. 250, figs. 1-5 and text adjacent. 



