from Iceland and Labrador. 109 



29. Tubulipora jlahellaris^ Johnst. 



In the form which I refer to this species, the zoarium is flat, 

 depressed, opaque, minutely specked, and somewhat rugose 

 transversely ; the tubes are placed horizontally, somewhat 

 radiately disposed, of comparatively large bore, free only for 

 a short distance at the extremity, the free portion not turning 

 upwards, but taking the horizontal direction. It is more or 

 less regularly flabellate in its mode of growth. It is well re- 

 presented by Johnston's figure and in Busk's ' Cyclostomata,' 

 plate xxiv. fig. 2. It is distinct, in my judgment, from the 

 true T. phalangea. 



Genus Diastopora, Johnston. 

 30. Diastoporttj sp. ? 



A small patch of a Diastopora occurs on a specimen of Cel~ 

 lepora incrassata^ but in so imperfect a condition that I cannot 

 determine the species with certainty. I believe it to be refer- 

 able to D. oheliaj Johnston, which is not uncommon in the 

 Arctic seas. 



Genus DiSCOPOKELLA, Gray. 



31. Discojyorella verrucaria^ Fabricius. 



Iceland ; abundant on Bertularella^ &c, 



[Bahusia {Lovin)] Spitzbergen (Swed. Exped., teste /S'wn'if^); 

 Greenland, Assistance Bay {Sutherland) ; Anticosti and Min- 

 gan Islands ; Bay of Fundy {Packard) ; Orkney and Arran 

 iBush).] 



Mr. Busk has rightly challenged Smitt's identification of this 

 form with the Discoporella flosculus (mihi). The latter is the 

 Melohesia radiata of Audouin, with whose figure I was unac- 

 quainted at the time (1862) of the publication of this species. 



Suborder Ctenostomata. 



Genus BuSKiA, Alder. 



32. Bushia nitenSj Alder. 



Iceland ; very fine, creeping over Hydroids. 



[Great Britain.] 



This seems to be the only Icelandic form not hitherto re- 

 corded from the Arctic seas. 



Of the 32 species contained in this list, 18 are British ; of the 

 latter, Hippothoa exjmnsa and Idmonea atlantica have only 



