80 BICELLARIID/E. 



BUGULA FLABELLATAj J. V. TllOmpSOn. 



Plate XI. figs. 1-3. 



Bird's head Coralline, Ellis, Corall. pi. xxxviii. fig. 7. 



Cellularia avicularia j8, Pall. Elench. 68: Van Ben. Eech. Bi-yoz. 48, 



pi. vi. figs. 1-8. 

 Flustra avicularis, J. Sowerhy, Brit. Misc. ii. 21, pi. Ixxi. : Flcm. B. A. 



506 : Johnston, B. Z. ed. 2, 346, pi. Lsiii. figs. 3, 4. 

 Flustra angustiloba, LamTc. An. s. Vert. eel. 2, ii. 222. 

 PCrisia flustroides, Lamx. Pol. cor. flex. 141. 

 Flustra capitata, Hogg, Nat. H. Stockton, 36. 

 Ornitiioporina avicularia, D' Orb. Pal. Fran9. Terr. Cret. v. 322. 

 Avicella avicularia. Van Ben. Bull. Acad. Eoy. Belg. xv. No. 2. 75 ; 9 



(Sep.). 

 Avicularia flabellata, J. V. Thompson, MS. Brit. Mus. 1847: Gray, 



B.M. Radiata, 106. 

 BuGULA FLABELLATA, Busk, B.M. Cat. 1. 44, pls. H., Hi. 

 BuGULA AVICULARIA, forma 2, B. flabellata, Smitt, ffifvers. K. Vet. 



Akad. Forhandl. 1867, 290 & 345; Flor. Bryoz. pt. i. 18. 



Zoarium composed of a number of flabellate shoots diclio- 

 tomously divided into numerous truncate segments, 

 somewhat circularly disposed, often slightly convoluted, 

 of an ashy colour when dry. Zooecia multiserial (4-7 

 rows) , oblong, of about equal width throughout, rectan- 

 gular above, aperture extending to the bottom ; two 

 spines at each upper angle, placed one above the other, 

 of which one is usually of considerable length, Avicu- 

 laria placed on the side of the cells, a little below the 

 top, those on the outer edge moderately large, the inner 

 much smaller ; head not swollen at the sides, well arched 

 above; beak of moderate length, the point abruptly 

 bent. Ocecia rather small, almost semicircular in form, 

 hyaline and smooth, with a wide opening, 



Polypide with 14 tentacles. 



Habitat. On stones, shells, crabs, Flustra foliacea 

 (very commonly) and other Polyzoa, &c., from moderate 

 depths to deep water ; occasionally at extreme low-water 

 mark. 



