40 



this tbere is a central placentral column to which the gemmules 

 are attached by an umbilical cord.* The polypes are alike 

 in both, and are liable to the same variations and irregularities 

 in the number of their tentacula. 



This species is sometimes abundant under large stones 

 between tide marks, in sheltered situations, on sea weed and 

 other marine productions, and is more abundant than I had 

 previously suspected. 



This is said to grow to the height of eight or ten inches, 

 but is more commonly found about one. It is very slightly 

 branched, much resembling the "knotted sea thread," from 

 which it is not at all times easy to distinguish it; but the 

 twisted or ringed foot-stalks to the cells are longer, and 

 not placed on enlarged parts of the stem, as in that species. 

 "The cells are deeply cupped, transparent, with a wide 

 even margin." The vesicles are urn-shaped, axillary and 

 smooth. 



CAMPANULA III A. 



Generic Character: Polypidom rooted, creeping, or when 

 compound erect, the main tube filiform, continuous, giving 

 off its pedunculated cells irregularly or in whorls; pedicles 

 frequently ringed, usually long; cells campanulate: vesicles 

 scattered, sessile. Polypes hydraform. 



* Stem a single tube* 



SMALL CLIMBING CORALLINE. C. Volubilis. Stem 

 creeping, tortuous, filiform ; cells bell-shaped, with serrated 

 rims on long slender ringed foot-stalks ; vesicles irregularly 

 ovoid, corrugated. 



Small climbing Coralline, with bell-shaped cups, Ellis' 

 Coral., p. 24, no. 21, pi. 14, fig. a A. Sert. volubilis, Ellis 

 and Solander's Zooph., p. 51, pi. 4, fig. e, f, E. F. Turton's 

 Lin., vol. 4 p. 680. Stewart's Elem., vol. 2, p. 444. Clytia 

 volubilis, Lamouroux's Cor. Flex., p. 202, no. 340. Cam- 

 panularia volubilis, Fleming's Brit. An., p. 548. Templeton 

 in Mag. Nat. Hist., vol. 9, p. 466. Johnston's Brit. Zooph., 

 p. 154, fig. 17. 



Hab. On the great tooth coralline, on the antennas of the 

 Corwich crab, on the remains of corallines, and Pinna ingens. 

 Common. Polperro. 



This species is very minute and so escapes common obser- 

 vation, but it is not at all rare on the remains of old corallines, 

 and on the antennae of crabs, where it enjoy s all the advantages 

 of locomotion in taking its prey. The cells are bell-shaped, 

 sometimes shallow and at others deep, with serrated mar- 



Vide, Introduction to the Hydroida, p. 4. 



