STYLASTERINA 287 



or pink colour. The corallum is arborescent and usually flaLelli- 

 form. The pores are distributed in regular cyclosystems, some- 

 times on one face of the corallum only, sometimes on the sides 

 of the branches, and sometimes evenly distributed. There are 

 styles in both gastropores and dactylopores. 



^Ulopora is difticult to separate from Stylastcr, but the species 

 are usually more robust in habit, and the ampullae are not so 

 prominent as they are on the more delicate branches of Stylastcr. 

 It occurs at depths of 100 fathoms in the Norwegian fjords. 

 A very large red species {A. nvhilis) occurs in False Bay, Cape 

 of Good Hope, in 30 fathoms of water. In this locality the 

 coral occurs in great submarine beds or forests, and the trawl that 

 is passed over them is torn to pieces by the hard, thick branches, 

 some of which are an inch or more in diameter. 



Astylns is a genus found in the southern Philippine sea in 

 500 fathoms of w^ater. It is distinguished from Stylaster by the 

 absence of a style in the gastropore. 



Cryptohelia is an interesting genus found both in the Atlantic 

 and Pacific Oceans at depths of from 270 to about 600 fathoms. 

 The cyclosystems are covered by a projecting lid or operculum 

 (Fig. 136, 11,1 2). There are no styles in either the gastropores 

 or the dactylopores. The ampullae are prominent, and are some- 

 times situated in the lids. There are several gonophores in each 

 ampulla of the female colony, and a great many in the ampulla 

 of the male colony. 



