of South Devon and South Cornwall. 259 



2. L. longissima, Pallas. 



Syn. L. dichotoma, var. /3, Johnston's Brit. Zooph. p. 102. 



Very abundant in the Coralline zone : in great masses amongst 

 the refuse of the trawl-boats. 



Mr. Alder, in his Catalogue (p. 32, pi. 3. fig. 4), has repre- 

 sented the cell of this species as deep and narrow, and strongly 

 denticulated. The examination, however, of adult specimens, 

 on which the cells had been well preserved, enables me to state 

 with confidence that this is not the case. The cell of L. longis- 

 sima is of moderate depth, and has a wide mouth, the margin 

 of which is cut into shallow and blunt crenations. Mr. Alder's 

 figure represents a distinct form, which he at one time believed 

 to be the young of longissima, not having had the opportunity of 

 examining the cells on mature specimens of this zoophyte. 



There can be little doubt that Lieut. Thomas's note on L. di- 

 chotoma (Johnston, Brit. Zooph. p. 466) refers to the present 

 species ; and he there rightly describes the crenulations of the 

 margin as shallow, and resembling those of Van Beneden's 

 Campanularia volubilis. 



3. L. gelatinosa, Pallas. 

 Exmouth; rare. 



This is the most beautiful of the British Campanulariadge, from 

 its graceful habit of growth and extreme delicacy. Dr. Johnston 

 speaks of it as sometimes attaining a height of 8 or 10 inches. 

 1 have a specimen from Exmouth which is about 6 inches high, 

 and consists of an exquisite cluster of as many as ten shoots. 



The cells are of the thinnest texture, and it is a matter of 

 the greatest difficulty to distinguish the crenature of the margin. 

 Dr. Fleming describes the rim as plain, and conjectures that 

 Pallas may have seen the tips of the tentacles showing above 

 the edge of the cell, and mistaken them for crenations ! The 

 Russian naturalist, however, was right. 



Milne-Edwards has made a new species out of Fleming's L. 

 gelatinosa, which he supposes to be distinct from the gelatinosa 

 of Pallas, and has given it the name of L. Flemingii. It is very 

 desirable that this name, which has found its way into some of 

 our lists of British zoophytes, should be expunged from the roll 

 of species, commemorating as it does a mere mistake. 



4. L. geniculata, Linn. 



Very common on weed, especially on the broad fronds of La- 

 minaria digitata, its chosen habitat. 



separated by any essential distinctions, and the species under consideration 

 really seems to constitute a transition-form between them" (' Middelhavet's 

 Littoral-Fauna 5 ). 



17* 



