ART. 12 HEXACTINELLID SPONGES OKADA 19 



Family HYALONEMATIDAE J. E. Gray, 1857 



Genus HYALONEMA J. E. Gray, 1832 



HYALONEMA (CYLICONEMA) APERTUM F. E. Schulze 



Sti/Iocalyx apcrius F. E. Schulze, Abli. kou.preuss.Akad.Wiss. Berlin, 18S6,p- 59. 

 Hyaloncma (Stylocali/x) apcrtitm F. E. Schulze, Rep. Voy. Challenger, vol. 21, 



p. 214, pis. 37, 38, 1887; Abh. kon. preuss. Akad. Wiss. Berlin, 1894, p. 39, 



pi. 8, figs. 1-6. 

 Hyaloncma a/fine Marshall, Zeit. Wiss. Zool., vol. 25, siippl., p. 225, 1875. 

 Hyalonema affine japonicum F. E. Schulze, Sitz-ber. Ges. Naturf. Freunde 



Berlin, 1899, pp. 112-129. 

 Hyalonema affine reticulum F. E. Schulze, Sitz-ber. Ges. Naturf. Freunde 



Berlin, 1899, pp. 112-129. 

 Hyalonema maehrenthelU F. E. Schulze, Abh. kiju. preuss. Akad. Wiss. Berlin, 



1894, p. 41, pi. 8, figs. 7-11. 



From a depth of 472 fathoms in the vicinity of Koshiki Island, 

 four specimens of Cylic(y)iema were dredged (Table 6). In all the 

 body is still well preserved, though the basal tuft remains in only 

 two. Specimens A to C show the cup -shaped sponge body, which 

 is characteristic of this species in Japan, while specimen D exhibits 

 a somewhat different outer configuration forming a transversely 

 extended thick-walled calyx, the lower end of which is somewhat 

 torn off but otherwise well preserved. The superior terminal surface 

 is nearly flat, somewhat fallen in at the center, and forms a hori- 

 zontally extending rim 50 mm broad, providing a sharp-angled pro- 

 jecting marginal fringe, which thins out toward the margin and 

 flares outward and backward. From the central sunken portion, a 

 markedly pointed and fairly long cone projects. An irregularly 

 formed large pore (incurrent canalar aperture) opens widely on 

 one side of the cone at its base, while near the base several fairly 

 large and nearly circular pores (incurrent canalar apertures) open. 

 The whole lateral surface shows distinctly, even to the naked eye, 

 the rectangular latticework of the dermal membrane. 



Table 6. — Measurements of 4 specimens of Hyalonema (Cyliconema) apertum 



It is doubtful whether a specimen (E) from Bungo Channel here 

 assigned to //. {Cyliconema) apertum really represents this species 

 or another. I consider it better for the present to place it with H. 



