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



Septa 12, all narrow, the directives a little wider. On the larger 

 branches are scattered rather large, open calicles, about l mm in 

 diameter. Some of the calicles have a long acuminate outer lip 



Ccenenchyma firm, rough, irregularly and roughly pitted, and 

 rudely echinulate. 



On the upper branches the larger radial corallites are divaricate, 

 tubular, obliquely truncate, with the calicles opening outward, and 

 with a short, thick, rounded outer lip. 



Red Sea ? (coll. Ward), probably now in the Field Columbian 

 Museum. Fragments are in the Yale Museum. No. 6139. 



EXPLANATION OF PLATES XXXVI-XXXVI F. 

 Plate XXXVI. 



[All the figures on this plate are natural size.] 



Figure 1. — Acropora tubigera Horn. Branchlet from the original type. P. 239. 



No. 1483. 

 Figure 2. — The same. Upright branch from a Singapore specimen. No. 1370. 

 Figures 2a, 2b. — The same specimen. Proliferous tubular corallites and 



branchlets from the outer and lower sides. 

 Figures 3, 3a. — Acropora prolixa Ver. Branchlets from the type. No. 1686. 



P. 237. 

 Figures 4, 4«. — Acropora striata Ver. Branchlets from the type. No. 1688. 



P. 251. 

 Figure .j. — Acropora pwm.Ua Ver. Branchlet from the type. No. 1687. P. 250. 

 Figure 6. — Acropora turbinata (Dana). Proliferous upright branch from the 



type. No. 2017. P. 242. 

 Figure 7. — Acropora cytherella Ver., sp. nov. An upright branchlet from the 



type. No. 201)7. P. 253. 

 FigureS. — Acropora symmetrica (Br.). An upright branchlet from a Zanzibar 



specimen. No. 79. P. 254. 

 Figure 9. — Acropora dissimilis Ver., sp. nov. A terminal branchlet from the 



type. No. 4341. P. 226. 

 Figure 10. — Acropora austera I Dana). A terminal branchlet from the type. No. 



4190. P. 226. 

 Figures 11, 1 lrr. 11/;. — Acropora tumida Ver. Branchlets from the type. No. 



886. P. 241. 

 Figure 12. — Acropora digitifera (Dana). A terminal branch from the type. 



No. 430. P. 228. 

 Figure 13. — Acropora Wardii Ver., sp. nov. An upright branchlet from the 



type. No. 6151. P. 248. 

 Figure 14. — Acropora secale (Stud.). Distal part of an upright branchlet of the 



type. Ceylon. No. 3063. P. 244. 



