168 ME. A. W. WATERS ON 



6. Idmonea tumida (Smitt). (PI. 21. figs. 4, 5.) 

 Tubulipora {Idmonea) tumida, Smitt, " Krit. Fort." 1871, p. 1119, 



pi. 20. fig. 7. 



Idmonea atlantica, var. tenuis, Busk, Rep. Brit. Assoc. 1859, p. 146. 



There is one specimen from Franz-Josef Land whicli is about 

 20 mm. long, but it is broken at eacb end ; about 5 mm. from the 

 lower end of the piece it divides into branches, dividing again 

 after about 19 mm. The branches do not spread out widely, 

 in this respect resembling I. atlantica, Eorbes ; they are about 

 0-6 mm. wide, and the series are about 0*7 mm. apart, while the 

 zocecia are about 0*1 mm. internal diameter. It will be seen 

 that the branches are much narrower than those referred to under 

 I. atlantica, Forbes, and the series are much closer together. 



The /. atlantica, var. tenuis, Busk, has not been figured or 

 fully described ; but in all probability this is the species that 

 has been frequently alluded to as var. tenuis, though, as the 

 zocecia are so much narrower, it would seem correct to consider 

 it a separate species. 



IjOc. Smeerenberg, Spitzbergen {Smitt). 



Jackson-Harmsworth Exp. : Lat. 77° 55' N., long. 53° 16' E., 

 130 fathoms. 



7. HORKERA LICHENOIDES {Pontop.). (PI. 20. figS. 1-6.) 



Besides the references given in Miss Jelly's Catalogue, see Bidenkap, 

 "Bryozoen von Ost-Spitzbergen," Zool. Jahrb. vol. x. 1897, p. 632, 

 pi. 25. fig. 4} id. Lyngenfjordens Evertebratfauna, 1899, p. 94; id. "Bry. 

 von Spitzbergen und Ivonig-Karls Land," Fauna Arctica, vol. i. pt. iii. 

 p. 529 ; Nordgaard, " Die Bry. des West Norwegens," Meeres-Fauna von 

 Bergens, p. 100 ; Gregory, J. W., The Cretaceous Bryozoa, vol. i. 1899, 

 p. 361, fig. 44 ; Andersson, K. A., " Bry. wahrend der Scliwed. Exp. 

 1898-1900 gesammelt," Zool. Jahrb. vol. xv. pt. ii. p. 551, 1902. 



This is an Arctic form which Busk gives as off Monte 

 Video (' Challenger ') , and Kirkpatrick as from Port Phillip, and 

 it has been stated to have been found in the Antarctic*; but I 

 have in various places stated that there is reason for considering 

 that a mistake in labelling has been made. A closely-allied 

 species, however, occurs in the Antarctic, which I have named 

 jS". antarctica, "Wat. Miss Jelly gives JS. ramosa, MacGr. f, as a 



* To this specimen, reported to have been brought back by the ' Erebus' and 

 ' Terror,' I have already referred, Journ. Linn. See, Zool. vol. xxviii. (1900) 

 p. 62. 



t MacGillivray, "Description of New or Little-known Polyzoa," pt. xii., 

 Trans. Eoy. Soc. Vict. 1886, p. 3, pi. 1. fig. 4. 



