1096 Zoophytes. 



fervoid, and varies in height to half an inch. It is composed of a sin- 

 gle row of tubular cells, which are curved at their upper ends in such 

 a manner that they all open in one direction ; they are linked toge- 

 ther in a single series, the termination of one being inserted into the 

 angle of the other. The apertures are circular and even. Above the 

 bent termination of each cell is a long slender calcareous bristle ; this 

 is hollow, but from its brittleness is not frequently to be found in pre- 

 served specimens. 



The characters of the new species, which I propose to call Crisia 

 setacea, are : — 



Crisia setacea. Cells long, tubulous, with curved terminations 

 turned alternately in opposite directions ; a long bristle below 

 the aperture of each cell. 



This is also a calcareous and confervoid species, but is more slen- 

 der and grows to a greater height than the last, though I have found 

 them much alike in these particulars. It is sparingly and dichoto- 

 mously branched. Compared with the last species it presents a well- 

 marked contrast in having the bent necks of the cells turned in oppo- 

 site directions, and the bristle is situated below instead of above the 

 orifice. From the apertures of the cells being turned in opposite di- 

 rections, the cells themselves might be said to be arranged in a bise- 

 rial manner. This cannot however be considered as strictly the case, 

 since they are inserted into each other at their terminations, and not 

 by their sides. 



Whether or not these two species have been included under the 

 name C. cornuta, it is not easy to determine, but the specific charac- 

 ters of that species as given by Linnaeus are not very definite when 

 compared with those given by others. Linnaeus, in Turton's edition, 

 describes it as "denticles alternate;" so also does Stewart, who how- 

 ever probably copied Linnaeus, while the modern species is described 

 as having a single row of bent cells. From this it is probable that 

 two species have been described under one name ; and there can be 

 no doubt that the one now described is distinct from the C. cornuta 

 of Johnston and the ' Cornish Fauna/ and I here propose to separate 

 them accordingly, trusting that the reasons assigned for so doing will 

 satisfy all Zoophytologists. 



R. Q. Couch. 



Chapel St., Penzance, July 21, 1841. 



