ON THE SOLITARY CORALS, COLLECTED BY DR A. WILLEY. 169 



Genus. Cycloseris, Milne-Edwards and Haime. 



12. Cycloseris hexagonalis (Milne-Edwards and Haime). 



Fungia hexagonalis, Milne-Edwards and Haime, Ann. des Sc. Nat., Ser. 3, t. IX., 

 PI. vi., fig. 2 (1848). 



I have referred one adult anthocyathus without any scar of attachment and fifteen 

 young specimens to this species. The young forms do not show the hexagonal characters 

 of Milne-Edwards' specimens. A full description, however, will be given later 1 . 



Loc. Blanche Bay, New Britain ; shore reefs. 



Family. EUPSAMMIDAE, Milne-Edwards and Haime. 

 GENUS. BalanophyUia, Searles Wood. 



13. BalanophyUia profundicella, n. sp. (Fig. 9.) 



The corallum is almost straight, cylindrical, attached by a spreading base. The 

 wall is devoid of epitheca, the living tissues covering about the upper third. The 

 costae correspond to the septa, and are broad, subequal and little projecting with 

 narrow intercostal spaces at the bottom of which the theca is but slightly perforated. 



The calice is slightly oval in shape with a very deep, central, axial fossa. The 

 septa are rather thin; their sides appear almost smooth, being covered with very 

 minute granules, and their edges are entire. They are arranged in six systems and 

 four cycles, all of which are complete. The primaries are prominently exsert, the 

 quaternaries on either side of them and the secondaries projecting to about half 

 their height. The primaries and secondaries axe rounded at their summits and end 

 almost perpendicularly by the axial fossa, the former extending furthest into the calice. 

 The quaternaries fuse deep down in the corallum over the tertiaries and again over 

 the secondaries, but the arrangement is not distinct and these septa appear often to 

 be fused with them. The axial fossa is closed in below by the fusion of all the 

 quaternaries very deep down in the calice. 



Greatest height of the single specimen, 1 1 mm. Long diameter of the same, 5 mm. ; 

 short diameter, 41 mm. 



Loc. Sandal Bay, Lifu; 40 fathoms. 



This coral comes near BalanophyUia pa mil a (Moseley) from the Philippine Islands. 

 It differs, however, in its inure elongate form, deeper axial fossa and in the quaternaries 

 on each side of the primaries being less enlarged. 



Genus. Thecopsammia, Pourtales. 



14. Thecopsammia regularis, n. sp. (Fig. 8.) 



The corallum is straight, almost the same diameter from base to calice, with a 

 thin epitheca, extending over about three-quarters of its height and somewhat trans- 

 versely marked with a well-defined upper edge. Above the epitheca costae are absent, 



1 J. S. Gardiner, "On the postembryonie development of Cvcloseris." This volume, p. 171. 



w. 24 



