310 HISTORY OF BRITISH ZOOPHYTES. 



" Perhaps the typical form of L, granifera may be con- 

 sidered to lie between these two extremes. The extreme 

 variety, /3, lies flat to the seaweed, and is cut into a finely 

 marked diamond pattern, round the four sides of which are 

 a row of dots or punctures. There is also an opening below 

 the mouth. The side dots rarely extend over the rest of 

 the cell, but as they occasionally do so, and the species 

 correspond in other particulars, it has not been thought 

 reasonable to separate this beautiful variety from Z. grani- 

 fera. The pure transparency of the cell in its young con- 

 dition — varied by a thicker line, which marks out its dia- 

 mond shape, and in which lie the row of dots — makes it a 

 very pretty object. It is so glassy in its texture that the 

 colour of the red Fhjllophora can be distinguished through 

 the cell. As it advances in age, the opening below the 

 mouth looks as if it was on a raised knob, and the flat 

 appearance of the cell is gone. 



"The figure of var. a represents its extreme state in which 

 the side horns and the heavy knob are so 2)rominent as to 

 be the leading features of the species. In modified instances 

 the front protuberance is lower, and the horns less distinct. 

 It is still, however, a very remarkable variety." 



13. Lepralia Landsborovii, J)r, Johnston. 



