146 



PEOF, P. MARTIN DUlSrCAIf's REVISION OF THE 



interrupted. Besides, there are what may be called false ealices, in 

 which a large septum is covered over for a short distance by a kind 

 of hood coming from some of the higher orders next to it. This 

 structure appears to have one large fleshy tentacle upon it. 



In the genus Lithactinia there are no subradiating ealices in 

 the median line, and all are of the false kind. This appears to 

 be of generic importance, and I retain the genus. The genera 

 Herpolitha, Polypliyllia, and Lithactinia form an Alliance on 

 account of the presence of false ealices in their compound coralla. 



G-enus Lithactinia, Lesson, Illustr. Zool. 1833 ; Milne-Edwards 

 Jules Saime, Hist. Nat. des Cor all. vol. iii. p. 28 (1860). 



Colony free and thin, hemispherical, cap-shaped, or almost plane 

 above, and echinulate and perforated at the concave base. CostsD 

 not distinct. Calices of one kind, nonradiate, and formed by 

 short septo-costal laminae, which are separated from those 

 before and behind by thin transverse processes, which arch over 

 them, and come from inferior septa. There are no true calices. 

 Synapticula present. 



Distribution . — Becent. Pacific islands, Oceania. 



G-enus Zoopiltjs, Dana, Zoophytes, JJ. S. Exploring Exped. 

 1846, p. 51. 



Colony free, budding and explanate. Polyps everywhere 

 scattered ; mouths radiately seriate. Coralla with the larger 

 lamellae radially prolonged quite to the margin, the intermediate 

 much smaller and short, and these alone interrupted by the 

 oririmes (small dej)ressions or centres of radiation = polyp- 

 mouths). Polyp-mouths in the intervals between the large 

 lamellae. 



Distribution. — Becent. Pacific. 



III. Family LOPHOSEEID^. 

 (Subfamily Lophoserince, Ed. & H.) 

 Fungidae in which the wall is neither perforated nor echinulate. 

 Synapticula exist, but not endothecal diissepiments. Septal 

 laminae usually solid, but occasionally with ill-defined perfora- 

 tions, remote from the bottom of the septa. 



Very considerable changes have taken place in the old sub- 

 family of Milne-Edwards and Jules Haime, the Lophoserincs, 

 owing to the introduction of new genera and the elimination of 



