380 ESCHARID^. 



margin slightly curved inwards ; peristome elevated in 

 the adult cell, forming a secondary aperture, with a 

 circular avictdarium on its lower lip ; immediately in 

 front of it a tall mucro. Ooecia small, globose, very 

 closely united to the surface of the cell above, granular. 

 Height ^ to 1 inch. 



Var. a [bicornis). With a cylindrical process on each side 

 of the orifice, bearing an avicularium on the summit. 



Var. /3 (foliacea) . Zoariiim forming a broad foliaceous 

 expansion, contracted towards the base, and rising from 

 a spreading crust : entire, contorted, and sinuated on 

 the margin. 



Habitat. On zoophytes, stones, and shells, from deep 

 water. 



Localities. Aberdeen (Skene) : Wick (C. W. P.) : St. 

 Andrews (var. foliacea), on Cyprina Islandica, from the 

 Coralline ground (Dr. Mcintosh) : 8 miles S.S.W. of 

 Mull of Galloway, 50 fathoms; 5 miles S.W. of Mull of 

 Galloway, 110-140 fathoms (Capt. Beechey) : the Minch ; 

 Shetland, 5-10 miles east of Balta, 40-70 fathoms ; Out 

 Skerries Haaf (A. M. N.) : Northumberland and Ber- 

 wick, not rare (Johnston) : Oban (var. bicornis) ; Torbay; 

 off Polperro (T. H.) : on stones and Pinnae, off the Dead- 

 man, rare (Couch) : east coast of Ireland, very deep water 

 (Miss Ball) : off the Maiden lighthouses, coast of Antrim, 

 62-72 fathoms (W. Swanston). 



Geographical Distribution. France, S.W., 50-60 

 fathoms (Fischer) : Roscoff (Joliet) : west coast of Nor- 

 way to Finraark; Oxfjord and Komagfjord, 20-30 fathoms, 

 on stony ground (Sars) : var. tridens (Busk), Norway 

 (M'Andrew) : Greenland (N. Germ. Pol. Exped.) : Kara 

 sea (Stuxberg and Theel) : St. George's Banks, 28-60 

 fathoms (Smith and Harger). 



Range in Time. Var. bicornis, Crag (S. W.). 



