ALCYONIDIUM DISJUNCTUM. 497 



coats, deep water, not unfrequent, " running over shells in 

 lines'' (Alder). 



This species is included by Mr. Alder under the above 

 name in his ' Catalogue.' I had previously corresponded 

 with him about it, and had so named it in my letters, but 

 had published no description of it. My specimens of it 

 have unfortunately perished ; and I can add but little from 

 my notes or from memory to the brief account which has 

 been given of it. 



The tubular aperture is very prominent and directed 

 upwards, projecting at the extremity of the cells, in- 

 stead of standing erect as in other species. To the best 

 of my recollection, the orifices are turned slightly out- 

 wards ; and I find, from a note made at the time of its 

 first occurrence, that it resembles a Stomatopora in habit. 



Alcyonidium DISJUNCTUM, Hiucks. 



Plate LXX. fig. 1. 

 Alcyonidium disjunctum, Hincks, Ann. N. H. ser. 4, xx. 217. 



Zoarium incrusting. Zocecia elongate -ovate, disposed in 

 linear series, which bifurcate at intervals and occasion- 

 ally anastomose ; the lines of cells bordered by a gela- 

 tinous crust ; orifice small, not raised, placed near the 

 anterior extremity ; cells often massed together. 



Habitat. On pieces of broken pottery. 



Locality. Unknown; probably Northumberland. My 

 specimens were received from Mr. Alder. 



The cells are elongate and sometimes subtruncate at 

 the two extremities, and are linked together in single 



2k 



