128 CLASS II.— ORDER II. 



culations thick and cuneiform, those of the bifurca- 

 tions being the largest, the terminals three-pointed or 

 oval. 



Mediterranean. 



Not a. It is not improbable that the Nodularia and 

 the Loricata may be mere varieties of the Officinalis. 



ELONGATED. 



4. CoRALLJNA elongata. Articulations of the base 

 cuneiform, those of the branches cylindrical, and 

 the terminating ones obtuse. 



Coasts of Calvados and English Channel. 



POLYCHOTOMOUS. 



5. CoRALLiNA polychotoma. Articulations nearly 

 triangular, sometimes undulated or else concave, flat 

 at the extremities, cylindrical in the stem, compressed 

 in the intermediate parts, frequently producing more 

 than three branches, which issue from the sides. 

 Height three or four centimetres. 



Found among the Thalassiophytes of the Bay of 

 Cadiz, and, from the various forms of its articulations, 

 is one of the most singular of the genus. 



LOBED. 



6. CoRALLiNA lobata. Articulations of the stems 

 and their branches cylindrical at the base, five or six 

 times larger, and compressed, or nearly flat, at the ex- 

 tremity, which is horizontally truncated, and marked 

 with three or four lobes of no regular depth ; the ar- 

 ticulations of the summits are of a leafy form ; colour 



