A. E. Verrill — Corals of the Genus Acropora. 211 



low, verruciform, and broad at base ; others are immersed, not 

 crowded, separated by coarsely and roughly echinulate and irregularly 

 pitted, dense coenenchyma ; the calicles are large and their 12 septa 

 are distinct and nearly equal. 



Singapore (coll. Capt. Putnam). Nos. 1370, a, b, c, d, etc., No. 

 148 3, fragment of type. 



Acropora Bandensis Ver., norn. nov. 



Madrepora tubigera Quelch, op. cit., p. 161. Brook, p. 79, (non Horn). 



Probably the specimens described by Quelch and by Brook, from 

 Banda, as 31. tubigera were not of this species, for they say that it 

 has a very porous coenenchyma ("extremely porous," Brook), while 

 in the type and in all our Singapore specimens it is remarkable for 

 its density and hardness. 



Brook also states that in the radial calicles the septa of the second 

 cycle are "usually not noticeable," which is contrary to the condi- 

 tion in this species. The axial corallites are also said to be labellate 

 or nariform. Therefore I propose to designate the Banda form as 

 A. Bandensis, with the diagnosis as given by Brook. 



Acropora tumida Verrill. 



Madrepora tumida Verrill, Synopsis Polyps and Corals North Pacific Expl. 

 Exp., Cornin. Essex Inst., v, p. 21, 1866. Brook, op. cit., p. 163. 



Plate XXXVI. Figures 11-116. Plate XXXVI B. Figures 2, 2a, 2b. 



Plate XXXVI F. Figure 3. 



This species is easily recognized by the evenness of the under sur- 

 face of the partially coalesced branches, with very small immersed 

 calicles, and by the short, swollen, thick-lipped corallites of the 

 upper surface of the larger branches. 



On the distal parts of the upright branchlets the tumid character 

 of the radial corallites is not so marked, and they are directed more 

 upward, or may become somewhat appressed, but they are thick at 

 the base, and taper to the summit, with the end rather squarely trun- 

 cated and the terminal calicle opening upward. 



The walls are echinulo-costulate, or sharply echinulate, with the 

 acute granules arranged in lines, and with very few pores. There 

 are six well developed septa, and often four to six rudimentary ones. 



The axial corallite is a little exsert, rather stout (2.5 to 3 mm ) with 

 thick walls and a small calicle with six subequal primary septa and 

 six small secondary ones. The calicle is not larger than that of the 

 radial corallites (about l mm ). 



Trans. Conn. Acad., Vol. XI. 16 January, 1902. 



