POLYPS AND COEALS. 21 



vided with a small ligulate border on the lower side ; those 

 on the larger branches opening outward, wholly immersed ; 

 the margins even with the surface of the branches. Coenen- 

 chyma strongly vermiculate and sharply scabrous. Branch- 

 es 6 or 8 inches long ; .5 of inch in diameter ; cells about 

 ,04. 



Ousima. Dr. Wm. Stimpson. 



This species is allied to M. stigmataria M. Edwards and 

 Haime, and M. virgata Dana. The latter differs in having 

 smaller and more crowded cells, which are throughout 

 tubular and slightly prominent. The former differs in its 

 mode of growth and the form of the corallites. 



Madrepora arbuscula ( ?) Dana. 



A fragment of a Madrepora closely allied to this species 

 is in the collection, in alcohol. It is the summit of a round 

 and rather slender branch, covered with prominent, tubular 

 corallites, varying considerably in size, crowded and directed 

 upward. The terminal ones are about twice as large as the 

 lateral ones. 



Kagosima Bay, Japan. Dr. Wm. Stimpson. 



Madrepora tumida Verrill, nov. sp. 



Corallum corymbose, the branches coalescing into a 

 broad, massive base, supported by a thick peduncle, the up- 

 per surface flattened. Towards the margin the branches 

 spread horizontally, and gradually become loo&ely coalescent 

 and free; from the whole upper surface arise numerous 

 nearly upright branchlets^ which are rather stout, about two 

 inches high, tapering rapidly, and mostly dividing into sev- 

 eral small secondary branchlets. Lateral corallites large, 

 thick and turgid, somewhat appressed, the cells large, open- 

 ing upwards, conspicuously stellate with twelve septa, of 

 which the secondary ones are much the narrowest ; two of 

 the primary ones, corresponding to the inner and outer sides 

 of the cells, are broader than the rest, and reach nearly to 

 the centre of the cells. Terminal corallites somewhat 

 larger than the lateral, exsert, the margin thick, very porous; 



