CKIBRILINA FIGULARIS. 197 



cells distinct to the naked eye. The youug, marginal 

 zooecia vitreous and glistening. 



RANGE op VARIATION. A very beautiful elongate variety 

 occurs, in which the ridges number as many as eighteen. 

 In some cases they are half obliterated, and the area 

 presents a very flat appearance. The avicularia are often 

 absent. Though really a very striking feature of the 

 species, they have not, I believe, been noticed by any 

 author, with the single exception of Heller. 



I have met with a curious monstrosity, in which the 

 area was so much reduced in size as only to occupy less 

 than half the length of the cell. 



The var. a is from Singapore. The fissured surface of 

 the area gives it a very different appearance from the ordi- 

 nary form ; but it exhibits no peculiarity that would war- 

 rant its erection into a species. 



HABITAT. Occasionally at low-water mark, and on 

 shells and stones from moderate depths to deep water 

 (60 fathoms). 



LOCALITIES. Cornwall, 30-60 fathoms; Guernsey, abun- 

 dant (T. H.) : Hastings (Miss Jelly) : coast of Antrim, 

 deep water, rare (Hyndman) : Birterbuy Bay, Connemara 

 (G.S.Brady). 



GEOGRAPHICAL DISTRIBUTION. Roscoff (Joliet) : Adria- 

 tic, not rare, on mussel-shells and Nullipores (Heller). 



RANGE IN TIME. Lower Coralline Crag (A. Bell). The 

 Escharella Arge, D'Orbigny, of the French Cretaceous 

 deposits, is most nearly related to the present species, so 

 far as the characters of the cell are concerned, but has an 

 erect and apparently foliaceous mode of growth. The spe- 

 cies described by Reuss under the name Lepralia Ungeri 

 seems to be a connecting form between C. figularis and 

 C. radiata. It is from the Austro-Hungarian Miocene 

 deposits. L. Haiteri from the same is most closely allied 

 to the present species, but has a sinus on the lower margin. 



