FAMILIES AND GE^fERA OE THE MADREPOEARIA. 



181 



fourth cycle, and a deficiency of that lateral junction of the 

 septa which is so generally characteristic of the family. 



Grenus Leptopsammia, Milne-Edwards Sf Jules Haime, Hist. Nat. 

 des Corall. vol. iii. p. 106 (1860). 



Corallum simple, adherent, tall, subturbinate, narrow at the 

 base. Calice elliptical, with a large and deep fossa. Columella 

 very developed, projecting. Septa not exsert, moderately close, 

 very thin, barely granulated ; tlie septa of the firfst and second 

 cycles nearly equal, the septa of the fourth order curved towards 

 the tertiaries, which they reach at a little distance from the 

 columella. The septa of the fifth order perforate, denticulate, 

 projecting barely from the wall. Epitheca rudimentary near the 

 base. Costse distinct. 



Distrihu tion. — Jxecen t . Philippines . 



Grenus Endopsammia, Milne- Udwards Jules Uaime^ Ann. des 

 Sci. Nat. 3^ ser. t. x. p. 92, pi. 1 (1848). 



Corallum short, straight, adherent by a broad base. Calice 

 circular, with a deep fossa. Columella spongy, well developed 

 and projecting. Septa stout, exsert, very largely granular. The 

 fifth order rudimentary, the fourth curving towards the tertiaries ; 

 these and the primaries large and nearly equal. CostsD well 

 developed. Wall thick and porous. A pellicular epitheca. 



Distribution. — Recent. Philippines. 



The following genera cannot be placed in Alliances : — 



Group. Incrusting colonial Eupsammid£e. 



Genus Astroides, Blainville. 

 Group. Fissiparous colonial Eupsammidae. 



Genus Lobopsammia, Ed. & H. 



Group. Simple Eupsammidee, budding from the wall. 



Genus Rhodopsammia, Semper. 

 Group. Colonial Eupsammidse, budding from stolons. 



Genus Rhizofsammia, Verrill. 



Genus Astroides, Blainville, Diet, des Sci. Nat. t. Ix. p. 332, in 

 Hist. Nat. des Corall. vol. iii. p. 131 (1860). 



Colony incrusting, massive. Corallites imperfectly united, or 

 free at their sides. Wall spongy, but dense. Calicos circular or 

 polygonal, free or united by tlieir edges. Columella very deve- 



