CELLEPORA TUBIGERA. 409 



to have more or less connexion with the ovicell. Occa- 

 sionally stout conical rostra occur, apparently uncon- 

 nected with a zocecium, bearing very large avicularia, with 

 broad triangular mandible. 



CELLEPORA TUBIGERA, Busk. 



Plate LIV. figs. 7-9. 



CELLKPOHA TUBIOEBA, Busk, Crag Pol. 60, pi. ii. figs. 8 & 10 : Mamoni, 

 Bryoz. foss. Ital., Contr. iv. 14, pL ir. fig. 25 (?). 



Zoarium adnate, irregularly convex or subconical. Zooecia 

 distant, connected by ridges, sparsely punctured ; orifice 

 orbicular, with a sinus in front j cylindrical tubular 

 processes supporting avicularia arising from the front 

 or side of a cell, or from the intercellular ridges. [Busk.] 



HABITAT. On shell, &c. 



LOCALITIES. Britain, south and west coasts (Busk) : 

 Lamlash Bay, Arran (G. West). 



GEOGRAPHICAL DISTRIBUTION. Coast of France (Jef- 

 freys). 



RANGE IN TIME. Coralline Crag, on shell (S. W.) : 

 ? Italian Pliocene (Manzoni). 



I am only acquainted with this species through the de- 

 scription and figures in the ' Crag Polyzoa/ and have some- 

 times fancied that it might be identical with C. avicularis. 

 It is difficult in this genus to form a positive opinion on 

 figures taken from the fossil ; the following, however, could 

 hardly have been written of the last-named: "Instead of 

 the strong conical rostrum, with an avicularium on its 

 inner aspect, so characteristic of Celltpora pumicosa, most 

 of the cells are provided with slender subcylindrical ascend- 

 ing processes, having a small avicularium at or near the 



