222 A. IE. Verritt — Corals of the Genus Acropora. 



and covered with sharp or blunt rough spinules, which are not very 

 line nor very closely arranged ; in some places it becomes reticulate- 

 porous. 



Singapore (D. ; V., type). Several perfect specimens are in the 

 Museum of Yale University (coll. Capt. Putnam and others) from 

 Singapore. I have studied others, from the same sources, in the 

 Mus. of Comp. Zoology; the Peabody Inst., Salem, Mass.; the Field 

 Columbian Museum, etc. Nos. 1777, 6118, Yale Mus. 



In mode of growth and general appearance this species resembles 

 A. Studeri (Br.); A. diversa (Br.); A. bullata (Br.); and A. frtiti- 

 cosa (Br.), but in the details of the corallites it does not appear to 

 agree very well with either of these. 



Acropora appressa (Ehr.?) Dana. Seep. 212. 



Madrepora appressa Dana, Zooph., p. 457, pi. xxxi, fig. 8; pi. xxxiv, fig. 5, 



(fnon Ehr., t. Brook). 

 Madrepora assimilis Brook, op. cit., p. 85, pi. xx, fig. A. 

 Madrepora alliomorpha Brook, op. cit., p. 87. 

 f Madrepora apjjressa Ehr., redescribed by Brook froin type, op. cit., p. 87. 



Plate XXXVI D. Figure 4. Plate XXXVI E. Figure 4. 



Fragments of the type of Dana are in the Yale Museum. No. 

 2029. Also numerous excellent specimens, of various ages, from 

 Singapore, which agree perfectly with the type. Nos. 1, 3, 5, 6, 8, 

 11, 1371, 1383, 5541. 



When young (up to 100 to 150 mm broad), this species does not 

 have the branches of the under side coalescent, or else they are only 

 slightly so. In this stage of growth the branches form a rounded 

 convex clump of much divided branches, arising from a stout basal 

 mass, the outer ones spreading and proliferous. Small branchlets 

 are also given off on the under side and soon begin to be appressed 

 and flattened, losing their prominent calicles. Gradually, as they 

 become more flattened and crowded, they begin to coalesce, openly 

 at first, but eventually, in large specimens, they may form a nearly 

 continuous plate, with few irregular openings through it, toward the 

 margins, as described by Dana. 



The immersed calicles of the under side are few, scattered, small 

 (0.5 mm ), but distinctly stellate, usually with 12 septa, the secondaries 

 narrow. 



The fragments from Dana's types apparently came from two speci- 

 mens. They have the following characters : 



The axial corallites are small (1.5 to 2 mm ), and about 1-2. 5 mm 

 exsert ; walls not swollen, calicle with 12 septa. The radial coral- 



