' 2 5 



Idmonea atlantica Waters, 1904, "Rés. Voy. Belgica", "Bry.", p. 90, PI. IX, fig. 5 (Antarctic). 

 Idmonea atlantica Nordgaard, 1906, "Bry. 2n<* Fram Exp.", Rep. 2"d Norw. Arct. Kxp., X" S, 



p. 36. 

 Idmonea atlantica Calvet, 1907, "Bryozoaires", Exp. Sci. Travailleur et Talisman, VIII, p. 469. 

 Idmonea atlantica Calvet, 1909, "Exp. Antarct. Erang.", "Bry.", p. 41. 

 Idmonea atlantica Norman, 1909, "Pol. Madeira", J. Linn. Soc., Zool., XXX, p. 278, PI. XXXIII, 



figs 1, 2. 

 Idmonea atlantica Thomcly, 1912, "Mar. Pol. Ind. Ocean", Trans. Linn. Soc. (2) Zool., XV, 



p. 156. 

 Tubulipora atlantica Osburn, 1912, "Bry. Woods Hole", Buil. Bur. Fisheries, XXX, p. 217, 



PI. XIX, figs 9, ga (good figures of zoarium, ovicell and ooeciostome). 

 Tubulipora atlantica, forma erecta Smitt, 1866, "Krit. förteckn." II, Öfv. K. Vet. Ak. Förh. 



XXXIII, pp. 399, 434, PI. III, figs. 6, 7; PI. IV, figs 3 — 13 (ovicell figured). 

 Idmonea radians Van Beneden, 1849, "Reen. Bry. Mer du Nord" (suite), Buil. Ac. Roy. Belg. 



XVI, p. 646, PI. I, figs 4—6. 



The synonyms here gïven are only a small selection of the records of this species, which 

 is believed to be cosmopolitan in its occurrence, extending from the Arctic to the Antarctic 

 Ocean l ). 



26. A. Stat. 53. Bay of Nangamessi, Sumba, o — 56 Metres; coral-sand ; near the shore, mud. 



o' -o* [ Stat. Ji- Borneo Bank, 3°27'S., ii7°36'E., 59 Metres; fine grey coral-sand. 



56. A. Stat. 80. Borneo Bank, 2°25'S., II7°43'E., 40 — 50 Metres; fine coral-sand. 



394. J. Stat. 144. Anchorage North of Salomakiëe (Damar) Island, 45 Metres; coral-bottom 



and Lithothamnion. 

 353. F. Stat. 240. Banda Anchorage, 9 — 45 Metres; black sand, coral, Lithothamnion-bank in 



iS — 36 Metres. 

 165. B. Stat. 248. Anchorage off Rumah Lusi, N. point of Tiur Island, o — 54 Metres; dredge 



and reef-exploration. 

 371. D. Stat. 273. Anchorage off Pulu Jedan, E. coast of Aru Islands, 13 Metres; sand and shells. 

 (? sp.) 459. H. Stat. Si. Pulu Sebangkatan, Borneo Bank, 34 Metres; coral-bottom and Lithothamnion; 



dredge and shore-exploration. 

 (? sp.) 394.O. Stat. 144. Anchorage North of Salomakiëe (Damar) Island, 45 Metres; coral-bottom 



and Lithothamnion. 

 (r sp.) 414. B. Stat. 315. Anchorage North of Sailus Besar, Paternoster Islands, o — 36 Metres; coral 

 and Lithothamnion. 

 (Mus. Zool., Cambridge) Torres Straits, 131, A. C. Haddon Coll., Reg. Feb. 24, 1898. 



Zoarium delicate, somewhat resembling that of Crisina radians, but the ramification 

 less profuse and the branches slightly reflexed, not usually becoming parallel. Basal surface 

 narrow and strap-like, marked off by sharp edges in the younger branches, generally slightly 

 concave and (in most of the 'Siboga' specimens) bearing ripple-like lines of growth, along 

 which the pores tend to be arranged in single transverse rows. Middle of the frontal surface 

 elevated ; the zooecia in alternating series, usually consisting of four zooecia, but sometimes of 

 five, three or even two. The median zooecium, or the first two from the middle, longer than 

 the outer zooecia. Ovicell a modified median zooecium, commonly beginning shortly before a 

 bifurcation and forking with the branch ; usually as long as many series of zooecia, in most 



1) MacGii.livkay (iSS2, McCoy's 'Prodr. Zool. Vict.', Pee. VII. p. 30), in describing /. australis, suggested that it might prove 

 to be a form of /. atlantica. It appeavs to me quite distinct, after compaving specimens of the two foims in the British Museum. 



«5 



