358 ESCHARID^. 



The mass of zooecia^ from which the linear series are 

 given o&, is sometimes of considerable size ; in other cases 

 branching commences at once, and the colony consists of 

 a very small nucleus, surrounded by long, straggling lines 

 of cells. 



Phylactella collaris, Norman. 

 Plate XLIII. fig. 3. 



Lepralia colI/ARIs, Norman, Rep. Brit. Assoc. 1866, 204. 

 Phylactella collaris, Hincks, Ann. N. H. Feb. 1879, 161. 



Zooecia ovate, small, crowded, convex, arranged in regular 

 radiating lines, smooth, or subgranular; orifice subor- 

 bicular, arched above, slightly truncate below; peristome 

 elevated into a broad, frill-like border, expanded in front, 

 which surrounds the sides and lower margin. Ocscia 

 somewhat reniform, depressed, punctured. 



Colonies small subcircular patches, of a brownish colour. 



Habitat. On shells, &c., from shallow to deep water. 



Localities. The Minch, Hebrides; Shetland, scarce, 

 80-100 fathoms; Guernsey (A. M. N.) : Torbay; Isle of 

 Man (T. H.) : Hastings (Miss Jelly) : off the Maiden 

 Lighthouses, Antrim, 72 fathoms (Swanston) . 



Nearly related to P. labrosa, Busk, from which it differs 

 in the absence of the perforated cell-wall, and the triplet of 

 marginal denticles. It also shows no tendency to the 

 dendritic habit of growth. The cells are arranged with 

 much regularity in linear series, which radiate from a 

 common centre. In certain states the punctures on the 

 ovicell are almost obliterated. 



