122 CATALOGUE OF THE ZOOPHYTES OF 



is especially the case between this species and the last. Their 

 mode of branching and annulation are so similar that, without 

 seeing the cells, they might readily be prononnced to be varieties 

 of the same. The cells of this species, however, are much deeper 

 and narrower than the other, and are very strongly denticulated 

 round the margin (PI. V., fig. 4). Unfortunately, on account 

 of their deciduous character, and the deep-water habitat of the 

 species, it is rare to meet with a specimen that retains any 

 vestige of them, even when got fresh from the fishing lines, 

 on which they are frequently brought on shore. L. longissima 

 (as thus distinguished) grows to a much larger size than L, 

 dichotoma, and has a stronger and darker stem, which is rather 

 more flexuose, and the branches more regularly alternate. The 

 stem becomes black in old individuals. From this circumstance, 

 together with its large size, there can be little doubt that this 

 is the species described by Pallas, though he does not give the 

 character of its cells. 



Lieut. Thomas says that he finds the cells of L. dicliotoma 

 {longissima ?) always crenulated ; but he adds that the crenula- 

 tions are shallow, and like those represented in Van Beneden's 

 figure of C. voluhilis* which does not exactly correspond with 

 my observations. 



3. L. GENICULATA, Linn. 



Johns. Brit. Zooph., 103, t. xxv., f. 1, 2. 

 On the fronds of sea-weeds, especially Laminaria digitata ; 

 very common. 



4. L. FLEXUosA, Hincks^ MS. 



Laomedea gelatinosa, var. «, Johns. Brit. Zooph., 



104, t. XXV., f. 3, 4. 

 Campanularia getiicidatciy Van. Ben. Cam^jan., 34, 

 t. iii., f. 1—6. 

 On rocks and stones between tide-marks, and occasionally 

 on sea-weeds; frequent. 

 Dr. Johnston was certainly wrong in uniting this species with 



* Brit. Zooph., 46C. 



