STCANDBA. 3 



SubfamHia SYCONINJE. 



Syconidae with unbranched, distally separate ciliated tubes, and 

 without comphcated canal-system. 



(Subgenera of Sycoues with the end-syllable " (Kja " of Haeckel.) 



I divide this subfamily, which comprises a great number of the Sycones, 



Haeckel, according to Haeckel's principle, preliminarily into the seven genera 



which, according to Haeckel, com])rise all Syconidae. 



Genus SYCANDRA. 

 Syconinae with diact, triact, and tetract spicules. 



Comprising Haeckel's subgenera Si/cocarjyus, Sycocercus, Sycocxihus, Syco- 

 trobus. 



Sycandra arborea, Haeckel. 



Sycandra arborea, E. Haeckel, Die Kalkschwamme ; eine Monographie, Baud ii. 



Seite 331 (1872). 

 Sycandra arborea, E. von Lendenfeld, " Das Nervensystem der Spongien," 



Zoologischer Anzeiger, viii. Jahrgang, No. 186 (1885). 

 Sycandra arborea, E. von Lendenfeld, " A Monograph of the Australian 



Sponges. — Part III.," Proceedings of the Linneau Society of New South 



Wales, vol. ix. part 4, p. 1095 (1885). 

 Sycon arborea, N. de Polejaefi, " Eeport on the Calcarea," The Zoology of the 



Voyage of H.M.S. ' Challenger,' part xxiv. p. 40 (1883). 



Branched sessile colonies, composed of more or less cylindrical tubular 

 individuals, with small frills. Colonies composed of from 5 to 30 persons, 

 each measuring from 8 to 20 millim, in length and from 4 to 8 millim. in 

 diameter. Inhalant pores very regularly disposed, and surrounded by rings 

 of inuscular cells — sphincters. The inhalant pores lead into subdermal 

 extensions of the intercanals, which are wide and have a quadratic transverse 

 section. 



S2yicides. — Oastral tetract Spicules. The radial centripetal ray pointing 

 towards the osculum and also curved in that direction, pointed, conic; 

 0-04-0'06 (exceptionally 0-08) x 0-008 millim. (Haeckel), 0-08 x 0-008 millim. 

 (my measurements). The two aboral rays paired and straight ; the other 

 longitudinal and curved, concave towards the gastral cavity; all of equal 

 size, 0-037-0-04 x 0-006 millim. — Parenchymal triacts. Sagittal ; lateral rays 

 0-16-0-1 X 0-005-0-006 millim. The unpaired ray in the proximal part 

 of the ciliated tubes shorter than the others, 0-05x0-004 millim.; in the 

 distal part longer, 0-12x0-007 millim. — Dermal diacts short and stout, 



B 2 



