202 CRIBRILINID^. 



The oral spines are generally four in number; but five 

 or six occur ; the foremost pair are often very tall and stout. 

 When old the zoarium loses its metallic sheen, becomes 

 of a dull white colour, and assumes a very skeleton-like 

 appearance. 



Habitat. On stones, shells, sponges, Algce, Ascidians, 

 &c., between tide-marks and in shallow water chiefly; 

 more rarely in deep water. 



Localities. South Devon, common, on stones, sponge, 

 &c., between tide-marks ; on Eschara foliacea, from 

 moderate depths (T. H.) : Tenby (F, Walker) : Cornwall 

 (C. W. P.) : Guernsey (Dr. M'Intosh) : Isle of Man 

 (E. Forbes) : Ayrshire (Landsb.) : the Minch; Shetland, 

 tide-marks and shallow water (A. M. N.) : Berwick (Dr. 

 Johnston) : St. Andrews, abundant between tide-marks 

 and in deep water (Dr. Mcintosh) : Scarborough (Bean) : 

 Wick and Peterhead, tide-marks and deep water (C. W. P.) : 

 entrance of Strangford Lough, deep water; Belfast Bay 

 (W. T.). 



Geographical Distribution. RoscoflF, very common on 

 stones and on Ascidia sanguinolenta, from shallow to deep 

 water (Joliet) : Douarnenez, Finisterre (Fischer) : Bohus- 

 lan, Algse and Ascidians, in shallow water, 7-10 fathoms 

 (Smitt)*: New Zealand (F. W. Hutton). 



Membraniporella melolontha. Busk. 



Plate XXVII. figs. 9, 10. 



Lepralia melolontha, Busk, B.M. Cat. ii. 78, pi. Ixxxt. fig. 3: Landsb. Pop. 



Hist. B. Z. 319, pi. xviii. fig. 70. 

 Lepkalia nitida, Tar., " braached in a fiue dencli-itic manner like Alecfo dila- 



fans," Johnst. Br. Zooph. ed. 2, .319. 



* iVof found as jet in Finmark or Spitzbergen (Smift). 



