A. E. Verrill — Corals of the Genus Acropora. 251 



Many of the lateral corallites are verrueifonn or low conoidal, 

 "with a wide thick base. 



The coenenchyma and walls are nearly uniformly covered with 

 close, rough, not very minute granules. 



Bonin Islands, U. 8. North Pacific Exj)). Exp. Yale Mus., No. 1687. 



Acropora striata Ver. 



Madrcpora striata Ver., Comiu. Essex lust., v, p. 24, 1866. Brook, p. 178. 



Plate XXXVI. Figures 4, 4a. Plate XXXVI A. Figures 4, 4a. 



Plate XXXVI F. Figure 7. 



This species is notable on account of the large size of the calicles 

 and the thin, flaring lips of the tubular corallites, which have regu- 

 larly costulate, thin Avails. 



The axial and gemmiferous radial corallites are either exsert- 

 tubular or somewhat trumpet-shaped, many being distinctly widened 

 distally and i'-2.5'"'" in diameter, with the Avide, round calicle about 

 1.5™"; they are often 4-5™™ long, Avitli thin, flaring, porous edges. 



The normal radial corallites are mostly openly tubular, about 3'"™ 

 long, Avith the summit obliquely truncated and the inner lip nearly 

 or quite adnate, but not at all appressed nor compressed. The outer 

 lip is thin, but firm, usually somewhat excurved, so that the calicle 

 is widely open (1.5'"'") and looks outAvard and upward. The coral- 

 lites mostly stand out pretty strongly, at angles of 50° to 70°. 



The septa are unusually Avell developed in the radial corallites ; 

 the six primaries nearly or quite meet in the center, rather deep 

 doAvn in the calicles; the directives generally unite: the secondaries 

 are narroAA', but usually distinct. 



The caMienchyma is firm, somcAvhat translucent, but with the sur- 

 face irregularly pitted and sharply echinulo-granulate. 



It is a handsome, shrubby or arborescently branched species, not 

 very close h^ allied to any other that I have seen, except A. tuhigera, 

 with AA'hich it has scA'^eral points in common. 



Ousima, U. S. N. Pacific Expl, Exped. Yale Mus., No. 1688. 



Acropora urceolifera Ver., sp. noA-. 



Madrepora vorymbosa Dana, Zoopli., p. 456, 1846 (non Lam.). 

 Plate XXXVI D. Figure 3. Plate XXXVI E. Figure 6. 



Plate XXXVI F. Figure 13. 



It is remarkable that no recent writer seems to have had in hand 

 the species described b}^ Dana as coryinhosa. A part of the orig- 

 inal type is in the Yale Mus., No. 4187, labelled in Dana's hand- 

 writinsj. 



