284 HISTORY OF BRITISH ZOOPHYTES. 
its numerous tufts, which are smaller and of a duller white 
than those of C. eburnea. 
Genus VII. CRISIDIA, WZ. Edwards. 
Gen. Char, Cells linked in a single series; the upper portion 
free and divergent.—Johuston. 
1. Cristp1a cornuta, Goat’s-horn Coralline. (Plate XV. 
fig. 51.) 
Hab. On other corallines and on seaweeds beyond low- 
water mark. 
Ellis, who gives a good figure of it, says, ‘“ This very 
small capillary coralline consists of branches of single cells, 
shaped like goats’ horns inverted, placed one above another, 
on the top of which is a small circular opening, which in- 
clines inwards. At the back of this rises a fine upright 
hair, near the insertion of the next cell above it.” It has 
oval-shaped vesicles, which are specked. The long bristles 
are sometimes jointed ; but we have not observed them so in 
the West, where it is often found, especially on Delesseria 
sanguinea. 
2. Crista sEeTacrA, R. Q. Couch. 
Hab. Shores of Devon and Cornwall, Couch; Salcombe, 
Rev. T. Hincks. 
