442 TUBULIPORID^. 



origin, and widen gradually upward, terminating in a 

 rounded and sliglitly expanded extremity : tliey constitute 

 together a composite or clustered colony. 



The zooecia show a decided tendency towards a fascicu- 

 late arrangement; in most cases only the orifices are 

 visible, and these are arranged in clusters of four or five 

 togetlier along the central line ; groups of two are some- 

 times interposed; and towards the base of the subcolony 

 there is only a single cell. In all cases the extremity is 

 occupied by a large cellular area, almost circular in form, 

 and somcAvhat raised. In one of the subcolonies the 

 zooecia are not collected in fascicles, but range in series of 

 three to four across the zoarium. They are short and 

 stout, and very slightly bent outwards at the top, and the 

 boundary lines are distinguishable. In this instance there 

 is a reversion to the arrangement which is usual in this 

 genus ; and in all cases, at the base of the subcolony the 

 cells are disposed as in an ordinary Stomatopora. 



The surface of the zoarium is dense and smooth, and of 

 a dark brown colour. 



In the character of the gemmation and the clustered 

 condition of the colony, and in the disposition of the cells, 

 this species stands alone amongst its kindred. 



Habitat. On shell, probably from deep water. 



Locality. Coast of Antrim (Hyndman) . 



Genus TUBULIPORA, Lamarck. 



Der. From tuhulus, a little tube, and Tropos. 



TLTBULiPORA(part.), Lamk. (1816): Johnston: Milne-Edwards: D'Orbigny : 



Smitt: &c. 

 TiBULiroKA, Busk : kc. 



