A. E. Verrill — Corals of the Genus Acropora. 245 



Some of the radial corallites are longer (2-3 mm ), with the outer 

 surface convex, or boat-shaped, and the calicle opening obliquely 

 inward. The radial corallites have six narrow primary septa, the 

 directives rather wider when the calicle is elliptical ; often 4 to 6 

 rudimentary septa of the second cycle are also visible. 



Point Pedro, Ceylon, 1843 (Rev'd Geo. H. Apthorp), Xo. 3063. 

 (See note, p. 210.) 



This is the type-specimen on which Dana based his description of 

 M. plantaginea. It, therefore, becomes also the type of 31. secale 

 Studer. Studer's 31. secale was simply a new name for Dana's 

 plantaginea. He gave no description. According to Brook (p. 88), 

 Studer's specimens in the Berlin Museum include more than one 

 species. He gave Singapore as the locality of his specimens. 

 Therefore he probably had in mind an East Indian form, rather than 

 the one from Ceylon. However that may be, Dana's type, from 

 Ceylon, in the Yale Museum, was the one that he described. 



The species described as 31. Ceylonlea by Ortmann, and by Brook, 

 with the other related forms described by Ortmann, from Ceylon, 

 appear to be varieties and diffei-ent stages of growth of this species. 



The specimens described by Brook, as M. secale, are probably a 

 different species, and more like A. appressa (Dana). 



In mode of growth this species resembles A. leptocyathus (Br.), 

 and also A. Guppyi (Br.). It may prove to be only a variety of 

 A. effusa (Dana), to which it is very closely related. 



The specimens from Singapore, mentioned but not described by 

 Dana, are quite distinct, with smaller upright branches ; those of 

 the lower side not forming a plate ; axial corallites smaller ; radial 

 corallites short and swollen. One of these types is in the Yale Mus. 

 (No. 2033). It is not 31. secale of Brook. I have described it below 

 under the name of A. secaloides. 



Acropora secaloides Ver., sp. nov. 



Madrepora plantaginea (pars) Dana, Zooph., p. 459, (non Lam., t. Brook). 

 Madrepora secale (pars) auth., (non Studer). 



Plate XXXVI. Figures 15, 15a. Plate XXXVI B. Figures 6, 6a. 



One of the specimens that Dana named 31. 'plantaginea, n<>\\ in 

 the Yale Museum, is quite distinct from the Ceylon specimen, on 

 which his description was evidently based, and which lias thus 

 become the type of A. secali (Studer), see p. 244. The specimen 

 referred to is from Singapore and apparently belongs to a species 



