TUBULIPORA FIMBRIA. 449 



Zoarium adnate, depressed, fan-shaped, sometimes with a 

 lohate margin, minntely punctate, and often transversely 

 rugose. Zocecia laid horizontally, semialternate, some- 

 what radiately (but not very regularly) disposed, of 

 comparatively large bore, generally free for only a 

 short distance towards the extremity, the free portion 

 not standing erect, but taking the horizontal direction. 



In habit, as well as in the minute characters, this species 

 differs very strikingly from the preceding, and it is diffi- 

 cult to understand the doubt which has been entertained 

 as to their distinctness. T. fimbria * is distinguished by its 

 flat, fan-shaped zoarium (this form is characteristic of the 

 adult), which is usually opaque, of a dull white colour, 

 and strongly wrinkled transversely. The cells are not 

 arranged in series, or at all connected together f ; they 

 are disposed somewhat irregularly, are slightly alternate, 

 and spread out radiately over the flabellate expansion. 

 They diflfer most markedly from those of T. flabellaris in 

 being horizontal, and destitute of the very tall, suberect 

 extremities which characterize the former. They are 

 stout and transversely wrinkled, and have a plain orifice. 

 The margin of the zoarium is frequently somewhat lobed ; 

 but the fan-shaped or plume-like figure is very constant. 



T. fimbria seems to be a specially northern form. 



Habitat. On Algse chiefly, shells, &c., in moderate 

 depths and deep water. 



Localities. Wick and Peterhead (C. W. P.) : North- 

 umberland, on Fusus Norvegicus, deep water, rare 

 (Alder) : Shetland (Peach, fide Alder) : co. Down (W. T.). 



* There seems to be room for doubt as to the identification of the present 

 form with T. fimbria, although Milne-Edwards's figure of the latter, wloich 

 was taken from a specimen labelled by Lamarck himself, certainly bears more 

 resemblance to it. Under the circumstances, however, it is better to accept 

 the decision, which is recommended by the authox-ity of Professor Smitt, than 

 to run the risk of needlessly introducing a new name. 



t •' Pagina . . . superiore tubulis solitariis obsita." — Fabricius. 



2 a 



