BRITISH ZOOPHYTES. 229 



when dried. Each cell has a single spine at each of its 

 upper angles. The cells are arranged in 2 — 6 series, and 

 are rectangular, with a,n orifice extending over almost 

 the entire front. The avicularia are large and rounded, 

 and placed on the outer side of the cells near the top. 

 The ooecia are globose, with a " hyaline border round 

 the orifice.'^ 



Mr. Gosse's description of Oellidaria avicularia 

 (D. C, 195) applies to this species. He points out as 

 a curious feature of the avicularia, that they continue 

 their motions after the death of all the polypides in the 

 zooecia. He describes the funnel-shaped spiral grdwth 

 of the zoarium as arising from fan-shaped branches, so 

 arranged as to be seen, on turning the whole round, 

 to compose one corkscrew band of fans. Mr. Gosse 

 gives a very full and interesting description of the 

 entire structure of this zoophyte. 



3. B. PLABBLLATA, Thompson. Plate XVIII. fig. 3. 



Flustra avicularis {Sowerhij, Flem., G. J., Lama;., 

 Be B., B. L., R. Q. C), F. angustiloba {Lamk.), F. 

 capitata {Hogg), Ornithoporina avicularia (B'Orh.), 

 Avicella avicularia {Van Ben.), Avicularia flabellata 

 {Thompson, Gray). 



Hab. : St. Andrew's (McL), Northumberland {Aid,), 

 Peterhead {G. W.P.), Filey, Isle of Man, South Devon 

 {T. E.), Menai Straits {A. 8. P.). 



The species is figured by Ellis as a variety of the 

 Bird's Head Coralline (Cor., plate xxxviii. fig. 7). 



The branches are fan-shaped, and the zooecia are 

 placed side by side in broad strap-shaped rows from 

 4 — 7 zooecia in breadth. The cells are oblong-, and 

 armed with two spines at each upper angle ; one spine 

 being generally longer than the other. The colour is 



