from all species of Cryptohelia in the presence of a style in the gastropores. Moreover the 

 character of the lid in S. virgiuis is different from that of Cryptohelia in being developed later. 

 The lid is also smaller and irregular. The dactylozooids do not atrophy on the side of the lid, 

 as in Cryptohelia, the cyclosystems being complete The cyclosystems vary very much in size, 

 beino- from 1,6 X 0,8 mm. to 0,8 X 0,6 mm. in diameter. 



7. Stylaster bilobatus sp. n. Plate I, figs. 9 and 10. 



Stat. 156. o°29'.2S., 130 5'. 3 E. N.W. of New Guinea. 469 M. Several small pieces, pink. 

 Stat. 251. 5°28'.4S., 132 o'. 2 E. Kei lis. 204 M. 1 piece, white. 



Stat. 297. io°39' S., i23°4o' E. Between Timor and Rotti Isl. 520 M. 1 young, white piece, 



3 old, yellowish pink pieces, from 2 different colonies. 



This species is flabellate and the branches do not anastomose (Fig. 9). The highest 

 piece is 40 mm. and the broadest about 35 mm. Probably these measurements are not very 

 much exceeded in the complete colony. The base of the thickest stem is 2 mm. in diameter. 

 The colour is pale pink, almost white at the tips of the branches. Three evidently very old 

 specimens from Stat. 297 were a dull, dirty-looking yellowish pink. The surface of the coral is 

 scattered over with a few small blunt spines (Fig. 10); these are most developed in the old 

 specimens. The cyclosystems are borne in a row on the two sides of the branches. They are 

 bracketdike, but they are peculiar in having the sides of the bracket very much developed, 

 while the abaxial side is very short, so that the cyclosystem looks like a pair of fan-shapeel 

 leaves, standing face to face. The cyclosystem is 0,7 mm. across transversely, by 1 mm. axial- 

 abaxially and the cyclosystems on either side of the stem are 2 mm. apart. 



The ampullae occur on both surfaces of the flabellum, always close to the cyclosystems. 



Fac. Alba. 



The two small white specimens from Stat. 251 and 297 seem to form a distinct facies. 

 Besides the difference in colour, the branches are not so zigzag in their growth and the cyclo- 

 systems are larger and more solidly built. The largest cyclosystem measures 1 mm. by 1,1 mm. 

 The differences however are not sufficiënt to constitute a distinct species. 



This species may be defined : 



Hydrophytum subflabellate, with bilobed, bracketdike cyclosystems. 



Stylaster sp. ? 



Stat. 59. io°22'.7S., i23°ió'.5E. S.W. Off Timor 390 M. 1 'dead' colony. 



This specimen is a much worn 'dead' colony. It is 26 mm. in height. The colour is 

 white : the surface is longitudinally striated. The cyclosystems are bracketdike and borne in a 

 row on each side of the branch. There is an ampulla on the surface of one branch. 



This coral probably belongs to the species 5. bilobatus, but the cyclosystems are too 

 much worn to identify it with certainty. 



