of the neighbourhood of Aberdeen, 



465 



Plumularia setacea. Don-Mouth ; a single tuft growing upon Mo- 

 diola barbata. 



P. Catherina. Often brought up by the fishing-lines from deep 

 water. 



P. myriophyllum. Deep water ; a single specimen. 



Laomedea dichotoma. Generally attached to Buccinum undatum, 

 Fusus antiquus and F. corneus ; brought up abundantly by the fishing- 

 lines. 



L. geniculata. On Fucus nodosus and Laminaria digitata ; plentiful. 



L. gclatinosa. Don-Mouth ; a single specimen. 



Campanularia volubilis. Don- Mouth ; met with only once. 



C. Integra. Stem a single tube, filiform, creeping ; cells on long 

 slender annular pedicles, campaniform, with the rim entire ; vesicles 

 -?. — J. M C G. 



This species, which I believe to be new, differs from the preceding in 

 having cells with the rim entire, and not serrulated, as in C. volubilis. 

 With C. Syringa, the only other British species of the genus which 

 has a single tube for a stem, it can never be confounded ; the 

 " denser corneous texture, cylindrical tubular cells, and short pedi- 

 cles " of C. Syringa are perfectly distinctive. Don-Mouth ; parasi- 

 tical on Tubularia indivisa ; has occurred only once. 



C. Syringa. Don-Mouth ; on Plumularia falcata ; apparently rare. 



C. dumosa. Both varieties are here abundant; of that mentioned 

 first in Dr. Johnston's work, I have a specimen covering a surface of 

 six inches square. 



Alcyonium digitatum. The red variety, supposed to be identical 

 with the A. rubrum of Miiller, I have frequently met with here. Mr. 

 Hassall * regards this as a distinct species, apparently on the sole 

 ground of not having "been able to detect any gradations of colour 

 between it and the common kind, as might be expected were it a 

 mere variety." Mr. Hassall further states, that, " having obtained 

 both growing upon the same shell, each possessing its own peculiar 

 colour," he considers this circumstance " a strong fact in favour of 

 its distinctness, as the great difference in colour could not be ac- 

 counted for by a reference to any external causes, both specimens 

 being subjected to the same influences." This argument, however, I 

 am afraid, is hardly tenable ; to be consistent, Mr. Hassall ought to 

 separate as so many distinct species those Sertularia which are oc- 

 casionally found of a bright pink colour, and make two species out 

 of Laomedea geniculata, of which Dr. Johnston has " often observed 

 coloured and colourless specimens growing upon the same stone f, 

 both being subjected to the same influences." At the same time 

 Mr. Hassall has shown that the coloured variety is not " A. digital- 

 turn in its primary crustaceous condition ;" the correctness of which 

 view I have since verified by finding red specimens of considerable 

 size coriaceous, but not crustaceous. On stones and shells from deep 

 water ; abundant. 



Actinia gemmacea. The variety <>. of Dr. Johnston's work, or that 

 characterized by having the body quite smooth, is brought up from 



* Ann. and Mag. Nat. Hist. vii. p. 285. 



t Brit. Zoopb. p. 152. 



