414 TUBULIPORID^E. 



TUBULIPORA LOBULATAj HaSSall. 

 Plate LXI. figs. 4, 5. 



TuBULipOEA LOBULATA, Hassttll, Anil. N. H. vii. 367, pi. x. figs. 1, 2: John- 

 ston, B. Z. ed. 2, 272: Hincks, Dev. Cat., Aim. N. H. ser. 'S, 

 ix. 307 (51 Sep.): Smitt, loc. cit. 400 and 454. 



TuBULiPOEA SERPENS (part.), Busl\ B.M. Cat. iii. 25. 



Zoarium closely adnate^ lobulate, punctate^ and of a dull 

 purplish colour; branches often disposed radiately 

 round a central pointy usually short and broad^ occa- 

 sionally of a narrower and more elongate type^ bifur- 

 cating slightly, and terminating in rounded lobes, 

 which are sometimes dilated. Zooecia short, very stout, 

 subcarinate in front, widening upwards ; the orifice 

 large and elliptical, and very slightly raised ; seldom 

 connate, crowded, and irregularly disposed, usually 

 covering uniformly the whole surface of the branch ; 

 in the terminal expansions somewhat radiately arranged, 

 or in longitudinal series, with distinct furrows between 

 them ; occasionally an obscure mesial line on the lower 

 portion of the branch. The basal lamina expanded 

 round the edge of the zoarium. 



This form has been treated by some writers as a variety 

 of Idmonea serpens ; but it wants the distinguishing cha- 

 racters of the genus Idmonea*. The habit is eminently 

 characteristic. Well developed specimens usually assume a 

 radiate mode of growth — a number of lobes, more or less 

 branched, with rounded and often enlarged extremities, 

 encircling a central point. In younger states the figure 

 is flabellate. Varieties occur in which the branching is 

 less regulai', and the lobes are elongate, narrow, and 



* The description of the present species is founded on a large series of 

 ppecimens, dredged off the Isle of Man, where it is very abundant. 



