1871.] MR. W. S. KENT ON NEW MADREPORES. 275 



the quills are more marked with black. The first four quills are 

 edged outwardly and tipped with black, their inuer webs being for 

 the most part of that colour ; the fifth to seventh less so by degrees, 

 with the white tip, not visible on the first and second, gradually in- 

 creasing in size. Bill black. Feet dark brownish red. 



This species is very common during winter at Amoy, ascending 

 the river in large parties at fall of tide, and pouncing on small fish 

 and crustaceaus left exposed by the receding water. 



April 4, 1871. 

 Robert Hudson, Esq., F.R.S., V.P., in the Chair. 

 The following papers were read : — 



1. On some new and little-known Species of Madrepores, 

 or Stony Corals, in the-British Museum Collection. By 

 W. Saville Kent, F.Z.S., F.R.M.S., of the Geological 

 Department, British Museum. 



[Eeceived March 18, 1871.] 



(Plates XXIII.-XXV.) 



Last year while engaged in arranging, naming, and preparing a 

 Catalogue of the Stony Corals contained in the National Collection, 

 numerous new and little-known forms fell beneath my notice, some 

 of which, with Dr. Gray's kind permission, I shall now proceed to 

 describe. 



Section APOROSA. 



Family Turbinolid^e. 



Acanthocyathus spiniger, n. sp. (Plate XXIII. figs. 1, 

 1 a, b, e.) 



Corallum turbinate, straight, slightly compressed ; attached when 

 young. Calice oval, the lateral extremities somewhat angular, its 

 fossa deep. Primary and secondary costse very prominent, the 

 former conspicuous from the base, and each bearing spinous pro- 

 longations, those situated on the two lateral costae the most developed. 

 Septa 48 in number, forming four complete cycles, much exsert, 

 more especially the primaries ; their lateral surfaces granulate, their 

 internal edge slightly flexuous. Columella elongate, formed of two 

 or three twisted lamellae. Pali slender, twelve in number, situated 

 opposite the septa of the third septal cycle. External surface of the 

 the theca finely granulate. 



Hab. Japan. B.M. 



