NORTHUMBERLAND AND DURHAM. 129 



In deepish water at Ciillercoats ; not rare. — J. A. Near 

 Hartleioool. — J. Hogg, Esq. 



7. C. DUMOSA, Flem. 



Johns. Brit. Zooph., 113, t. xxvii., f. 2 — 5. 

 On other zoophytes, shells, and stones in deep water; com- 

 mon. 

 This species, in its free and erect state, has a robust mode of 

 growth. Besides the two varieties mentioned by Dr. Johnston, 

 there is another with rather smaller cells and a simple stem, 

 which is attached only at intervals to other zoo^Dhytes, hanging 

 from them in a festooned fashion. 



8. C. GRACILLIMA, 71. Sp. PL VI., fig. 5, 6. 



Stem erect, compound, sub-unilaterally branched : cells very 

 slender, long, tubular, thin, set on loosely twisted pedi- 

 cles of about two whorls : aperture entire. Height 1 in. 

 On shells and zoophytes from deep water; occasionally. 



This is a critical species, greatly resembling C. dumosa, from 

 which it can only be distinguished by comparative characters, 

 though its general appearance and habit at once strike the eye as 

 something distinct. It is much smaller than C. dumosa, thinner 

 in texture, and more flexible when fresh, with narrower cells set 

 on longer pedicles. The stem is erect, and generally compounded 

 of two or three tubes, diminishing to one at the ends of the 

 branches. It is a good deal branched; the branches often rising 

 more from one side of the stem than the other. The cells are 

 long, very slender, thin and transparent, with a smooth rim: 

 they are set on pedicles about one-fourth the length of the cells, 

 loosely twisted, and making about two turns. They generally 

 rise at a less angle from the stem than in C. dumosa, and are more 

 fragile, being very apt to fall off when dry. The cells of C. du- 

 mosa, on the contrary, are more persistent than in any other 

 species of the genus. C. gracillima appears usually to assume 

 the erect form ; only in one instance have I observed it creeping 

 over the surface of a shell near the base of the ascending stems. 



A Campanularia from Bass's Straits, of which Mr. Busk has 



