BRYOZOA OF THE PHILIPPINE REGION 281 



Genus HASWELLIA Busk, 1884 



HASWELLIA AUSTRALIENSIS Haswell. 1880. 



Plate 30, figs. 6-9 



1887. Porina coronata. var. b Waters, Bryozoa from New South Wales, North 

 Australia, Annals and Magazine of Natural History, ser. 5, vol. 20, p. 

 190, pi. 6, fig. 5. 



1890. Haswellia australiensis Kirkpatrick, Hydroids and Polyzoa Torres Strait, 

 Scientific Proceedings Royal Dublin Society, new series, vol. 6, p. 612. 



1913. Haswellia australiensis Waters, Marine Fauna British East Africa and 

 Zanzibar, Proceedings Zoological Society of London, p. 513 (bibliog- 

 raphy) . 



1913. Haswellia australiensis Canu, Etudes morphologiques sur 3 nouvellcs 

 families de Bryozoaires, Bulletin Soci6t6 Geologique de France, ser. 4 r 

 vol. 13, p. 144 (bibliography). 



1921. Haswellia australiensis Marcus, Results of Swedish scientific expeditions 

 to Australia, Kongl. Svenska Vetenskaps-Akademiens Handlinger, vol. 

 61, No. 5, p. 18. 



Measurements. — Distance of verticels, 1.00 mm.; diameter of peri- 

 stome, 0.24-0.28; zooecial width, 0.40; and diameter of branches, 1.50. 



Structure. — Our sections confirm those of Levinsen and Waters; 

 the spiramen opens into the peristomie, very much above the oper- 

 culum; the orifice of the ovicell is placed in the peristomie between 

 the spiramen and the operculum which never closes it. A transverse 

 section made at the level of a verticel of apertures is very instructive; 

 it shows three concentric zones, that of the peristomies, that of the 

 bases of the distal zooecia and that of the walls of adjacent zooecia. 

 The section of Busk made between two verticels is quite different. 

 The operculum is similar to that of Waters 1887; the muscular 

 attachments are placed almost at the border. (See text fig. 41.) 



This species is common; it has been the object of excellent studies 

 by Waters and Levinsen. Nevertheless we are still ignorant of 

 many details of its organization; larva, anatomy, mode of fixation, 

 number of tentacles, etc. 



Biology. — The species is particularly abundant from 30 to 40 

 meters; it has not been observed in the littoral zones less than 10 

 meters; it remains then a bryozoan of the high seas. In the Phil- 

 ippines it has been dredged to a depth of 378 meters; never before 

 had it been observed at so great a depth. At all the depths it is 

 identical in character and dimensions. 



Almost all of our specimens were dead; a few living specimens 

 have permitted us to observe that it was in reproduction February 

 15, 1908. These living specimens were colored green. 



This is a tropical species with a much reduced geological distri- 

 bution. 



Occurrence. — 



D. 5134. Balukbaluk Island, Sulu Archipelago; 6° 44' 45" N.; 

 121° 48' E.; 25 fathoms; fine S. 



