BUGULA AVICULARIA. 75 



<ic above supports the pyloric valve; and beyond this 

 the intestine dilates into a large oval cavity, extending 

 to the point of exit at the base of the tentacles. 



Altogether the alimentary canal presents a rather cha- 

 racteristic form; while the general appearance of the 

 polypide is affected by the rudimentary condition of 

 the oesophagus. 



The Buffults are not unfrequently brightly coloured. 

 They are very widely distributed ; and in B. neritina (the 

 type of the genus as constituted by Oken) they have a 

 cosmopolitan representative, which is to be met with in 

 most seas*. 



BUGULA AVICULARIA, Linnaeus. 



Plate X. figs. 1-4. 



BIRD'S-HEAD CORALLINE, Ellis, Corall. 36, No. 2. pi. xx. figs, a A. 



SEKTTLARIA AVICCLARIA, Linn. Syst. ed. 10, 809. 



CELL A KI A AVICULARIA, Ell. Sf Sol. Zooph. 22 : Lamk. An. B. Vert. ed. 2, ii. 



191. 

 Bi-fii-LA AVICULAHIA, Oken, Lebrb. Naturg. 90 : Busk, B.M. Cat. i. 45, pi. liii.: 



Alder, North. Cat. 59 (sep.) : forma 1, Smitt, CEfvere. K. Vet. 



Akad. Forhandl. 1867, 289 & 339, pi. xviii. figs. 9, 10, 

 . 12-15. 



CKISIA AVICCLARIA, Lamx. Pol. corall. flex. 141. 

 CKLLCLARIA AVICTLARIA, Johmt. B. Z. ed. 2, 338, pi. Ixiii. figs. 7,8: Landsb. 



Pop. Hist. 341, pi. xix. fig. 72. 

 CELLULARIA AVICULARIS, Reid, Ann. N. H. ser. 1, xvi. 389: Dalyell, Reui. 



An. Scotl. i. 241, pla. xlviii., xlix. 

 ORKITIIOPORA AVICCLARIA, D'Orbigny, Pal. Fran<;. Terr. Cret. v. 322 1. 



Zoarium bushy; branches flabellate, divided dichoto- 



* " Acamarchut neritina, qui parait maintenant babiter le monde enticr, 

 se fixe a la quille dea navires et ee fait transporter partout" (D'Orbigny, 

 4 Voyage dans I'Amlrique meridionale,' t. T. 4 me partie, Zoophytes, fig. 10). 



t I do not give Avicella amcularoules. Van Ben., as a synonym. He 

 describee the avicularia of his species as having mandibles "courtts et 

 ramatate*," t*rms which arc not applicable to those of the present form. The 



