18/1.] MR. W. S. KENT ON NEW MADREPORES. 285 



Balanophyllia malaccensis, n. sp. 



This form closely resembles B.floridana (Pourtales), but may be 

 distinguished by its well-developed and spongious instead of papil- 

 lose columella, and by the freedom from granulation of the lateral 

 surfaces of the septa. 



Hab. Malacca. B.M. 



TURBINARIA PARVISTELLA, n. Sp. 



Corallum massive, convex. Ccenenchyma abundant, very porous. 

 Calices small, superficial, their apertures even with the surface of 

 the coenenchyma, not exceeding a line in diameter. Columella well 

 developed, spongious. Septa of equal size, varying from twelve to 

 eighteen in number. 



Described from a specimen in the Oxford Museum, and of which 

 a small fragment has been placed in the National Collection. 



Hab. Unrecorded. 



The non-prominent calices isolate this species from those hitherto 

 described, and would seem to separate it from the genus Turbinaria 

 of Milne-Edwards, which he characterizes as possessing prominent 

 calices. In T. cinerascens, however, it frequently occurs that while 

 the greater portion of the calices project considerably, the remainder 

 are on a level with the surface of the ccenenchyma j and hence the 

 character quoted, though dominant, cannot be considered essentially 

 diagnostic of the genus. 



Turbinaria parvistella in the massive form and yet extremely 

 porous texture of its corallum, and in the entirely sessile character of 

 its calices, shows its affinity to the genus Astreopora, from which 

 it differs only in the possession of a well-developed columella. 



EXPLANATION OF THE PLATES. 



Plate XXIII. 



Fig. 1. Acanthocyatkus spiniger, enlarged 2 diameters, showing the spinous 

 prolongations of the primary costs. 

 1 a. The same from above, illustrating the interior of the calice. 



1 b, c. Early conditions of the same form. 



2 & 2 a. Flahellwm matricidum. Two young specimens, nat. size, showing 



their mode of gemmation from the parent calice. 



2 b. Longitudinal section of an adult example of the same coral, enlarged 

 2 diameters, exhibiting the septal arrangement and the rudimentary 

 condition of the columella, a portion of the parent calice still remain- 

 ing attached. 



2 c. A calice of the same species viewed superiorly. 



3. Tridaeophyllia echinata. Corallum, nat. size, viewed from above. 



4. Tridacophyllia alcicomis, nat. size, viewed laterally. 



5. Balanophyllia imperialis, nat. size, lateral aspect, 



5 a. Calice of the same, from above, enlarged 1£ diameter. 

 5 b. Diagrammatic illustration of a single system of the same coral, showing 

 the relationship and arrangement of the septal elements. 



Platk XXIV. 



Fig. 1. Sti/laster amphiheloides, nat. size. 



1 a. A small ramuscule of the same, magnified 3 diameters, and illustrating 

 the alternate distal mode of gemmation. 



