NORMAN, ON RARE BRITISH POLYZOA. 219 



to an ashy colour hi drying, but B. calathus preserves the 

 yellowish horn-coloured hue which it has in life. The ovi- 

 cells are proportionately somewhat larger, the lateral avicu- 

 laria much larger, and the spines shorter and blunter than in 

 B. flabellata, of which a figure (fig. 9) is given for com- 

 j)arison. 



My late friend Mr. Alder agreed with me in considering 

 the species here described to be distinct from B. flabellata ; 

 and for the accurate illustrations of this and the other species 

 here described, except the Hemescharee, I am indebted to him 

 as among the last of many kindnesses. Some of the figures 

 were among the last drawings that he made before he w^as 

 seized with the fatal illness which deprived us of the most 

 able and the most accurate of British marine zoologibts. 



BUGULA PURPUROTINCTA. 



Buyula fastigiata, Alder. Cat. Zoophytes Northumberland 



and Durham, p. 59. 

 Cellularia plumosa, Johnston. Brit. Zooph., 2nd edit., p. 341, 



pi. Ixi {but not of Busk) . 



This Bugula seems generally to take the place of B.jjlumosa 

 in the north, but both species are found on the coast of 

 Durham. I have dredged it at Shetland and on the North- 

 umberland coast, and have received it from Seaham, county 

 Durham (Mr. Hodge), and Scarborough (Mr. Bean). The 

 beautiful purplish-red tint it assumes when preserved will 

 enable it at once to be distinguished without any micro- 

 scopical examination from B. j)lumosa ; it is also a much 

 larger and stronger species. Norway (Sars). 



Mr. Alder referred this Bugula, which he well described, 

 to the Sertularia fastigiata of O. Fabricius ; but Smitt has 

 pointed out (' Ofversigt af K. Vet. Akad. Forh.,' 1867, p. 

 291) that Fabricius, in a subsequent paper {' Nye Zool. 

 Bidr., in Vid. Selsk. Skr.' (Havniaj), vol. i, 1821, p. 35), 

 stated that the S. fastigiata of his ' Fauna Groenlandica ' was 

 synonymous with Sertularia argentea ; and, judging from 

 the synonyms given by Linnseus, it w^ould seem that the 

 Sertularia fastigiata of the ' Syst. Nat.' is our B. plumosa 

 rather than the present species, which it becomes necessary, 

 therefore, to name. 



Bugula turbinata, Alder, 



Bugula turbinata, Alder. Mic. Journ., vol. v, p. 1T4, j)l. xvii. 

 This pretty species appears to be much more common and 



VOL. VIII. NEW SER. R 



