4 
THE VOYAGE OF H.M.S. CHALLENGER. 
(2) Crisia eburnea, var. laxa (PL II. fig. 1). 
Sertularia eburnea, Linne. 
La Sertolara d'avorio, Cavolini, Sprengel. 
Cellularia eburnea, Pallas, Bruguieres. 
Cellaria eburnea, Soland., Bose, Lamarck, Jolinst., Transact. Newc. Soc., voL ii. p. 262, pi. xi. fig. 5. 
Crisia eburnea, Lamx., M. -Edwards, Fleming, Jolinst., Templeton, Blainville, Risso, Couch, 
Hincks, Norman, Alder, Hassall, Van Beneden, Rech. s. l’Anat. des Bryoz., Mem. Brux., 
t. xviii. p. 52, pi. vi. figs. 12-16; Busk, d’Orbigny, Pal. Franc., p. 598; Joliet, Arch, de 
Zool. Exp6r. et Gen., vol. vi., 1877. 
Character. — Zoarium small, tufted. Zocecia usually three to seven in each internode 
(rarely nine to eleven) loosely aggregated. Branches usually arising from the first or 
lowest zooecium in an internode, sometimes from the second or third. Aperture circular, 
sometimes slightly pointed on one side. Ooecia pyriform, surface even. Branches 
Off 5 mm., zocecia 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 ; Boscoff, 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. 
Crisia 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. Fort, ofver Skand. Hafs-Bryoz., p. 117 (nec 
Floridan Bryoz.) ; Waters, Ann. and Mag. Nat. Hist., ser. 5, vol. iii. p. 269 ; Vine, Joliet. 
Cellaria ardica, Sars (teste Smitt). 
Character. — Zoarium 1 to 3 inches high, of straggling growth. Zocecia almost 
straight, connate nearly throughout their entire length. Aperture elliptical, usually 
pointed on one side. Ooecial 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] 
