IO 



to this facies. There are a few ampullae, but the method of growth is active. Pourtales 

 fio-ures and gives a very short description of another small specimen of this variety. 



Facies Altus. Hydrophytum irregularly flabellate; surface smooth; may be ioo 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. 5". eximius fac. dcntatus. Plate I, figs 4 — 6. 



Stat. 144. N. of Salomakiëe Isl. 45 M. Several pieces. 



Stat. 274. 5°28'.2S., i34°53'.o,E. N. E. Aru Isl. 57 M. 1 Ex. 

 Stat. 310. 8° 30' S., 119 7'. 5 E. E. of Sumbavva. 73 M. One colony. 



This facies also is subflabellate with non-anastomosing- branches. The lonmtudinal 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 Dcntatus. 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. eximius fac. irregularis. 



Stat. 310. 8°3o'S., iiq°7'.5E. of Sumbavva. 73 M. Several pieces. 



This facies forms an intermediate stage between the facies dcntatus and minor, the next 

 to be described. S. eximius fac. irregularis 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 



