36 



53- Ampliihclia tenuis Moseley. 



Lophohelia tenuis Moseley. Challenger Deep Sea Madreporaria, p. 180, pi. VIII. figs. n — 14. 



Stat. 95. 5°43'.5 N., 1 i9°4o' E. 522 m. A small fragment. 



There is no coenenchyma ; the calicles are small long and trumpet-shaped, and their 

 outer surface is longitudinally striped with rows of fine rounded granules. 

 Distribution. Off the Philippines. 



XXII. Sclerohelia Edw. & H., Duncan. 



54. Sclerohelia formosa Alcock. 



? Cyathohelia formosa Alcock. Investigator Deep Sea Madreporaria, p. 26, pi. III. figs. 2, 2a. 



Stat. 289. 9°o'.3S., i2Ó°24'.5E. 112 m. Several pieces. 

 Distribution. Off the Maldives : off Celebes. 



III. Family Astr.eid.e Edw. & H. 

 The collection contains but one species of this family. 



XXIII. Pourtalosmilia Duncan. 



Blastosmilia Duncan. Trans. Zool. Soc. Lond. X, 1877 — 79, p. 244 (1878). 

 Pourtalosmilia Duncan. Journ. Linn. Soc. Zool. XVIII. 1884 — 85. p. 72 (1884). 



55. Pourtalosmilia dumosa n. sp. Plate V, fig. 33, 33^. 



Stat. 156. o°29'.2S., 130 5'-3 E. 469 m. Some dry branches. 

 Stat. 259. 5°29'.2S., I32°52'.5 E. 487 m. A fragment. 



The parent corallum is long, straight or slightly sinuous, cylindrical, and of the same 

 diameter throughout : it gives off, on every side, buds which grow out into branches like but 

 shorter than the parent, and these again give off a few short secondary branches : the primary 

 and secondary branches may unite to form a bush with scalariform ramifications. The whole 

 outer surface of the corallum is covered with fine discrete granules and is traversed by fine 

 granular costal striations. 



The calicular orifice is circular and the fossa extremely deep. The fossa is but little 

 encroached upon by the non-exsert septa, which are in six systems and three cycles, those of 

 the first cycle being much larger than those of the second which again are a little larger than 

 those of the third. All the septa are thin, entire, and sometimes microscopically granular or 

 spicular. 



The septa of the first cycle unite at the bottom of the calicle, but there is no columella. 



The dissepiments are thin sheets of vitreous tissue placed very far apart. 



