228 NATURAL HISTORY OP 



{Lamx., Temp.), Cellularia avicularia {G. J., D. L., 

 B. Q. C), C. avicularis {Reid, Dal.), Ornithopora avi- 

 cularia (D'Orb.). 



Hab. : Hebrides, Shetland (A. M. N.), Peterhead 

 {C.W.P.), South Devon (T. E.), Cornwall {R. Q. 0.), 

 Seascale and Blackpool {A. S. P.). 



This species is often confounded with the succeeding 

 one, and both are named by Ellis the " Bird^s Head 

 Coralline/^ His description and plate xx. a A, apply 

 to this species, and his figures G, H, on plate xxxviii. 

 apply to B. turhinata. Ellis was greatly puzzled by 

 the avicularium. He says : " On the outside of each 

 cell we discover, by the microscope, the appearance of 

 a bird's head with a crooked beak, opening very wide; 

 the use of which is as yet unknown to us, not having 

 yet seen this species in its proper element." 



Each cell has three spines ; two at the upper outer 

 angle, and one on the inner upper angle. The avicu- 

 laria are large, and placed midway on the outside of 

 each cell. The branches of this and the succeeding 

 species are fan- shaped (flahellate). In colour the 

 zoophyte is orange-brown when living, and almost 

 white when dried. 



2. B. TURBiNATA, Alder. Plate XVIIL fig. 2. 



Cellularia avicularia {Pall., P. H. O.). 



Hab. : Ilfracombe [P. H. G.), Herm, Guernsey {Aid.), 

 Tenby (Dyster), Llandudno, Isle of Man, South Devon 

 {Hincks), Menai Straits {A. S.P.). 



This species is larger than the preceding, growing 

 to 2 inches in height. It grows in flabellate branches, 

 spirally arranged round the central stem, so as to look 

 like a series of funnels placed inside each other. 

 The colour, when living, is orange, becoming paler 



