THE VOYAGE OF H.M.S. CHALLENGER. 



(2) Crisia eburnea, var. laxa (PL II. fig. 1). 



Sertularia eburnea, LiBH^. 



La Sertolara d'avorio, Cavolini, SprengeL 



Cellularia eburnea, Pallas, Eruguiferes. . - 



Gellaria eburnea, Soland., Bosc, Lamarck, Johnst., Transact. Newc. Soc, vol ii. p. 262, pi. xi. fig. 5. 



Crisia eburnea, Lamx., M. -Edwards, Fleming, Johnst, Templeton, Blainville, Eisso, Couch, 

 Hincks, Norman, Alder, Hassall, Van Beneden, Eech. s. I'Anat. des Bryoz., Mem. Brux., 

 t. xviii. p. 52, pL vi figs. 12-16; Busk, d'Orbigny, Pal. Frang., p. 598; Joliet, ArcL de 

 Zool. Exp^r. et Gdn., vol. tL, 1877. 



Character. — Zoarium small, tufted. Zooecia usually three to seven in each internode 

 (rarely nine to eleven) loosely aggregated. Branches usually arising from the first or 

 lowest zooecium jn an internode, sometimes from the second or third. Aperture circular, 

 sometimes slightly pointed on one side. Ooecia pyriform, surface even. Branches 

 0"15 mm., zooecia about 0'07 mm. in diameter. 



Habitat. — Station 149, D. and I., off Kerguelen Island, 28 to 105 fathoms, 

 volcanic mud. 



[Seas of Europe ; Spitzbergen, Smitt ; Madeira ; Adriatic ; Eoscoff, Joliet.] 



Except in its rather more loose mode of growth this form does not differ in any 

 essential character from the common Crisia eburnea. 



(3) Crisia denticulata, Lamarck, sp. (PL II. fig. 3). 



Cellaria denticulata, Lamk. 



Crista luxata, Fleming, Blainville, Johnston (ed. 1), Couch. 



Crisia denticulata, M.-Edw., Johnst., ed. 2, p. 284, pi. 1. figs. 5-6; Gray, Sars, d'Orb., Gosse, 

 Alder, Busk, Hincks, Norman, Smitt, Krit. For. Ofver. Skan. Hafs. -Bryoz., p. 117 {nee 

 Floridan Bryoz.); Waters, Ann. and Mag. Nat. Hist., ser. 5, vol. iii. p. 269; Vine, Joliet. 



Cellaria arctica, Sars (teste Smitt). 



Character. — Zoarium 1 to 3 inches high, of straggling growth. Zooecia almost 

 straight, connate nearly throughout their entire length. Aperture elliptical, usually 

 pointed on one side. Ocecial cells truncate, often with three or more transverse 

 annulations. Branches usually arising in an internode from or above the fourth cell 

 (sometimes from the second in the lower parts of the zoarium). Branches 0"23 mm.^ 

 zooecia 0"07 mm. wide. 



Habitat. — Off St. Paul's Rocks, shallow water. Station 186, lat. 10° 30' S., 

 long. 142° 18' E., 8 fathoms, coral mud. Off Inaccessible Island, Tristan da Cunha, 60 

 to 90 fathoms. 



[Coasts of Britain and Ireland; Norway ^ Spitzbergen ? Grand Manan ? Stimps. ; Bay 

 of Naples ; Roscoff.] 



