REPORT ON THE HEXACTINELLIDA. 221 



occurrence of rather small elongated forms, with narrow umbel-rays (PI. XLI. fig. 10). 

 Very frequent, on the other hand, is the occurrence of the familiar small amphidiscs with 

 ten- or twelve-rayed, short, hemispherical umbels (PI. XLI. fig. 11). 



In the gastral membrane and in the lining of the larger eff"erent canals the hypogastral 

 oxjrpentacts are absent, but strands of oxydiacts of various thickness, with or without 

 central thickening and projecting nodes occur abundantly. The autogastral pentact pinuli 

 are strikingly distant from one another, and bear long, pointed, somewhat spinose basal 

 rays, and a rather long spindle-shaped, thickened proximal with short, almost scale-like 

 teeth (PI. XLI. figs. 2, 8). Small amphidiscs with twelve- or more rayed, short, hemi- 

 spherical umbels occur abundantly in the gastral membrane. The cufi'-like limiting fringe 

 round the sharply defined oscular margin consists of oxydiacts, almost 1 mm. long, in 

 which the proximal ray is quite smooth and simple, and uniformly narrowed into a sharp 

 point, while the free distal ray, close above the smooth inner portion, is beset in fir-tree- 

 like fashion with scale-like or pointed spines, projecting oblic[uely outwards, and also 

 exhibits a spindle-shaped thickening (PI. XLI. fig. 3). 



5. Hyalonema {Stylocalyx) globus, n. sp. (PI. XL.). 



Near the Banda Islands, in the Malay Archipelago (Station 194a, lat. 4° 31' S., long. 

 129° 57' 20" E.), from a depth of 360 fathoms and volcanic mud ground, a specimen 

 of Hyalonema was dredged which difiered in some points from the species hitherto 

 described. The body which is almost globular measures 23 mm. in length and 22 mm. 

 in breadth. On the superior pole there is a round oscular aperture, 4 mm. in diameter, 

 with a sharp tangentially directed margin bounded by a thin fringe of spicules (PL XL. 

 fig. 1). Through this terminal opening the gastral cavity can be seen with the somewhat 

 pointed conus rising from below, and with four cruciately disposed radial septa, extending 

 from the lower portion of the conus to the margin, towards which they become broader. 

 The lower pole of the spherical body bears an apparently much damaged basal tuft. 

 The scanty spicules do not exceed 0*2 mm in thickness (PL XL. fig. 1). The whole 

 uniformly curved external surface of the body is covered with a dermal lattice- 

 work, the distinct meshes of which are approximately or perfectly square, and formed of 

 strands which are arranged like the lines of longitude and latitude on a globe. 



The parenchyma is supported by strongly developed smooth medium-sized oxyhexacts, 

 and by oxydiacts of variable length and thickness disposed in strands. Besides these 

 smooth oxydiacts, forms occur in some abundance, in which not only both ends, but the 

 central portion, and rarely the whole spicule, are more or less thickly covered wath 

 centrally directed barbs. Four cruciately disposed projecting nodes occur in the centre, 

 and these are sometimes continued into curved hooks (PL XL. fig. 5). The parenchyma 

 further contains a considerable number of very slim, smooth oxyhexacts of variable size. 



