IO 
to this facies. There are a few ampullae, but the method of growth is active. PourTALES 
figures and gives a very short description of another small specimen of this variety. 
Facies A/tus. Hydrophytum irregularly flabellate; surface smooth; may be 100 mm. in 
height; cyclosystems small, bracket-like, not projecting far; in old specimens, the edges of the 
septa are joined and the cycle of dactylozooids completed. 
b. S. extmius fac. dentatus. Plate I, figs 4-—6. 
Stat. 144..N. of Salomakiée Isl. 45 M. Several pieces. 
Sialie Qi SANS Wey a edeld, INGIDs Jue Wl ye INI, at VBpte 
Stat. 310. 8°30 S., 119° 7.5 E. E. of Sumbawa. 73 M. One colony. 
This facies also is subflabellate with non-anastomosing branches. The longitudinal striations 
are well marked, otherwise the surface is smooth. The specimen from Stat. 310 (Fig. 4) is 
very pale pink, those from 144 and 274 are yellowish white. The latter are young colonies 
(Fig. 6) of 55 mm. in height, the former, an older one, is 70 mm. in height and 3 mm. in 
diameter at the base of the main stem. The peculiarity of this variety is the breadth of the 
cyclosystems (Fig. 5), which are often 1 mm. in diameter and their close proximity to one 
another, two successive cyclosystems on one side of the stem being about 1,2 mm. apart or 
even less. When young the cyclosystems project 0,5 mm. from the surface, which gives a 
very dentate appearance to the branches. They are gradually worn down with age. The cyclo- 
systems embrace the stem, that is to say the two ends of the semicircles of dactylozooids are 
carried further round the stem than in the previous facies; as a result of this, complete cycles 
of dactylozooids are never formed. The ampullae occur all over the surface of the branches; 
the specimen from Stat. 310 is much distended by them. In this case the surface of the 
ampullae is smooth, in the other specimens that have gonads the surface exhibits small knobs 
or protuberances. 
Facies Dentatus. Hydrophytum irregularly flabellate; surface smooth; up to 70 mm. in 
height; branches dentate in appearance owing to the shape of the cyclosystems which are bracket- 
like, large, project far and are closely placed; complete cyclosystems are never formed. 
c. S. extmtus fac. trregularis. 
Stat. 310. 8°30'S., 119°7'.5 E. of Sumbawa. 73 M. Several pieces. 
This facies forms an intermediate stage between the facies denfatus and mznor, the next 
to be described. S. exemzus fac. trregularis is very irregularly flabellate, with non-anastomosing 
branches and is about 45 mm. in height. The diameter of the thickest part of the stem is 
2 mm. that of the axis at the base of the terminal branches 0,8 mm. The colour is white or 
purplish pink; the surface smooth, but exhibits delicate longitudinal striations. The bracket-like 
cyclosystems are large and except in the older branches, embrace half the stem, that is to say, 
if they grew in pairs, the edges of the cyclosystems would touch. The cyclosystems are about 
0,8 mm. in transverse diameter and project 0,55 mm. from the stem. Successive cyclosystems 
