CAMPANULARIAD.E : CAMP ANUL ARIA. Ill 



Hob. Parasitical on other corallines and the lesser fuci, not un- 

 common. 



This is only to be distinguished from C. volubilis by the aid of 

 the microscope. The two species frequently grow intermixed, and 

 their habit is the same, but the syringa is easily distinguished by its 

 denser corneous structure, its cylindrical tubular cells, and the 

 shortness of the pedicles which support them. Polypes with eight fili- 

 form equal tentacula. What distinguishes this from every other 

 species is its operculum, a name which Van Beneden gives to a lid 

 of a conical shape formed by a prolongation of the margin of the 

 polype-cell. When folded down or drawn within the cell, the top of 

 this appears truncated, as shown in our figures. Van Beneden 

 delineates the polypes with at least ten tentacula. 



5. C. LACERATA, cells on short stalks, ovato-conical, the upper 

 half cleft into six lanceolate segments. G. J. 



PLATE XXVIII. FIG. 3. 



Hob. Parasitical on Plumularia falcata in Berwick Bay, G. J. 

 At St. Andrew's, on Cellularia scruposa, J. Reid. 



Cells arising from a slender tubular stem which creeps up the 

 ramifications of other corallines, scattered, on very short pedicles 

 consisting of four or five equal rings, ovate, the upper part of a 

 conical form, and divided into six deep lanceolate segments, which, 

 in our specimens, are all connivent, and form an acute apex. The 

 texture of the cell is so thin and transparent that it is difficult to 

 determine, in all cases, the exact number of these segments ; and 

 in some cells Professor Reid observed two or three other linear seg- 

 ments to be attached. In one cell, in which the polype was con- 

 tained, two of these segments crossed each other. " Polype hydra- 

 form : tentacula 16 or 17, with numerous whorls (about 20 in 

 number) of small tubercles adhering to their outer surface. The 

 polype can extend itself to a great length, even to more than twice 

 the length of the cell. The circulation of nutritive juices in the 

 pith of the pedicles, and the stomach of the polype, was very well 

 seen." Prof. John Reid. 



