A. E. Yerritt — Corals of the Genus Acropora. 259 



Indo-Pacific (coll. Ward), No. 6130, Yale Museum. Also Field 

 Columbian Museum. This species is somewhat allied to .4. nasuta, 

 but is different, not only in growth, but the corallites are more 

 arched and incurved ; the walls are more finely costulate and not so 

 rough; the septa are less developed; and the texture more porous. 



In mode of growth and form of branches it resembles A. Kentii 

 (Br.) and A. obscura (Br.), but neither of those species have the pecu- 

 liar form and structure of radial corallites seen in this. 



Acropora paniculata Ver., sp. nov. 



Plate XXXVI D. Figures 7, 10, 10a. Plate XXXVI E. Figure 5. 



Coral much branched, forming small dense clumps, 150 to 200 mm 

 high and broad, in which the principal branches, which are 12 to 

 15 mm in diameter at base, are repeatedly forked ; branches proli- 

 ferous on all sides, with slender ascending or somewhat excurved 

 branchlets of different lengths, thus producing panicle-like groups of 

 branchlets. The terminal branchlets may be 20 to 40 mm long, and 

 3 to 5 mm in diameter, tapered, acute, often bearing 1-3 long, exsert, 

 tubular corallites, besides the axial one. 



The axial corallite is slender and exsert, about 1.5 mm wide and 3 to 

 5 mm long, with a thin strongly costulate wall and a regular 12-rayed 

 calicle. 



The exsert, tubular, lateral gemmiferous calicles may be 6 to 8 mro 

 long and 1.5 mm in diameter, with 1-3 small basal buds, and costulate 

 wall; the calicle is round and terminal, as in the axial one, with 12 

 distinct septa; some of them are slightly larger or clavate distally. 



The normal radial corallites are prominent, ascending, elongate- 

 tubular, obliquely truncate, nearly as large as the axial ones, with 

 round calicles ; the more distal ones usually have the inner lip free 

 for some distance and the end only slightly obliquely truncated, 

 with thin, porous, but firm, costulate walls ; those lower down have 

 the inner lip adnate, or nearly so, and the aperture more oblique, 

 with the lower lip a little prolonged, and sometimes a little 

 thickened; some of them are slightly wider distally; all are strongly 

 costulate. 



On the bases of the branches they become short-tubular, or verru- 

 ciform, and many are entirely immersed; these have calicles about 

 l mm in diameter, with 12 narrow septa. 



The coenenchyma is firm, sparingly porous, irregularly pitted, 

 sparsely covered with minute, sharp granules. 



