26 
sides of the coral. The branches do not exceed 10 mm. in length; they do not branch much, 
when they do it is often dichotomous; the diameter at the base of a terminal branch is 1,2 mm. 
The colour is white, the surface smooth except for the usual pits made by the terminations 
of the canals which are irregularly scattered on the main stem and arranged so as to form 
longitudinal striations on the younger branches. The cyclosystems have a diameter of 1,2 mm. 
They are round or irregular in shape. The ampullae occur as swellings round the base of the 
cyclosystem. Male ampullae only were found (Fig. 34 and 35). 
This species is closely allied to C. ¢enuzs, the chief difference being the larger size and 
stouter growth of the colony of C. major and the larger size of its cyclosystems. 
The species may be defined: 
Hydrophytum not flabellate, 30 mm. in height; main stem stout, hollow, fistulose and 
coalescing, inhabited by a polychaet worm; cyclosystems 1,2 mm. in diameter; ampullae as 
swellings round the cyclosystems. 
Steganopora gen. nov. 
Plate Wil tigss 36.937 and 3. 
This genus differs greatly from all other genera of the Stylasteridae in having the zooids, 
both gastrozooids and dactylozooids, in very close communication by short, broad canals. In other 
Stylasterids, the only connexion which exists between the zooids is the coenosarcal net-work of 
canals. Conopora, however, is a partial exception, the dactylozooids being closely connected with 
the gastrozooid by short broad canals. The gastrozooids and dactylozooids in Steganopora are 
very long and penetrate very far down the stem (Fig. 38). In consequence of the close proximity 
of the zooids, each zooid has not a separate and distinct pore; there is no true base to it and 
consequently there are no styles. The gastropores are without a scale and lie concealed among 
the long, tubular dactylopores, which give the surface a very spiny appearance. A spadix is 
present in the male gonophore. There are several gonophores in each ampulla. 
1. Steganopora spinosa sp. n. Plate III, figs. 36, 37 and 38. 
Stat. 150. 0° 6’ N., 129°7'.2 E. Djilolo Passage. One fragment. 
Unfortunately only a very small fragment, 15 mm. in length, was obtained. There are no 
side branches. The diameter of the base of the stem is 2,5 mm. The colour is white. The surface 
of the coral, between the zooid pores appears smooth until it is calcined, when small irregularly 
scattered pores of the coenenchym network appear. The gastropores are round or rather irregular 
in shape and about 0,3 mm. in diameter. The dactylozooids are numerous and irregularly placed. 
They are situated in tubular pores which project upwards and outwards. They vary in size; the 
largest are about 1,2 mm. in length. The ampullae occur all over the surface of the coral. 
Externally this species resembles Sfznzpfora echinata (Moseley) but the likeness is only 
superficial, the character of the canal system and dactylozooids being in no way similar. The 
gastrozooids of Steganopora also differ from those of Spzxzpora in having no style. 
