90 ^»TSIS OF BRITISH SIVWKEDS. 



ject. Tt differs from C. officinalis chiefly In the form of 



the upper joints of the stem and branches, \\ r hich arc broad 

 and ilat, with prominent and usually sharp angles. 



XLVIT. JAXIA. 



150. rubens ( The red Jania) ; articulations of the principal 

 branches and ramiili cylindrical, about four times as Long 

 as broad, Lam. Cor. Flex. p. 272. (Atlas, PI. XXXIY. 

 Rg. 164.) 

 Corallina rubens, Ellis and Solan d. 



Hah. Parasitical on the smaller Alga?, between tide-marks. Per- 

 ennial. Summer. 

 The commonest species of the genus Jania and the most 

 widely diffused. The genus Jania, if we confine it to the 

 dichotomously branched species, may be allowed to stand 

 as distinct from Corallina, at least in habit ; but it must be 

 admitted that the two genera approach very nearly, if they 

 do not rather merge one into the other. Had we only to 

 consider European forms, we might think differently. But 

 the shores of warm countries, and especially of Australia, 

 yield beautiful species, having the pinnated habit of Coral- 

 Una with the antennated fruit (if so I may called it) of 

 Jania. From J. corniculata, which it outwardly much re- 

 sembles, J. rubens may at once be known by the long cy- 

 lindrical lower articulations ; and this much is generally 

 sufficient to ascertain the species. But I observe on some 

 specimens, especially those from the south of England, an 

 occasional prolongation of the upper angles of the articula- 

 culation, showing a tendency to approach J. corniculata. 

 Several exotic species nearly resemble J. rubens in habit, 

 differing chiefly in size and in the comparative length of 

 the articulations. 



151. corniculata {The horned Jania)) articulations of the prin- 

 cipal divisions obconical, compressed, their upper angles 

 sharp and prominent ; those of the uppermost ramuli cylin- 

 drical, filiform, Lam. Cor. Flex. p. 274. (Atlas, PI. XXXIV . 

 Fig. 155.) 



Corallina corniculata, Linn. 



Hob. Parasitical on the smaller Alga?, in rock-pools between tide- 

 marks, and in 4-5 fathoms water. Perennial ? Summer. 

 Southern shores of England and Ireland. 

 Jania corniculata differs from the more common J. rubens 



chiefly, if not altogether, in the form of the lower articula- 



