520 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



I'age. 

 Figs. 2. A specimen, natural size, with both crowded and rather remote calices, 



on the same corallum 465 



3. A specimen, natural size, most of the calices crowded, intercorallite 



areas very narrow, except at lower left-hand corner, where there is 



a distant, circular calice 465 



4. Duncan type of Astroria antiguensis, natural size, Geological Society 



of London. Compare with figure 2 of this plate 466 



Plate 132. 



Figs. 1, 2, 2a, 26. Cyalhornorpha antiguensis (Duncan) Vaughan, from Porto 

 Rico. 



1 . Calices, natural size 466 



2. 2a, 2b. Three views of the same specimen. 2, corallum, natural size 



2a, 26, calices, X 4 466 



3,3a. Cydthomorpha tenuis (Duncan) Vaughan. Two views of a specimen 

 from Porto Rico. 



3. Corallum, natural size 467 



3a. Calices, X 4 467 



Plate 133. 



Fig. 1. Duncan's type of Astroria affinis, natural size, Geological Society of 

 London. Probably a synonym of Cyathomorpha antiguensis (Dun- 

 can) 466 



Cyathomorpha tenuis (Duncan) Vaughan. 



2. Calices, X 2, of a specimen, with crowded calices, from Porto Rico. . . 467 



3, 3a, 36. Three views of a specimen from Willoughby Bay, Antigua. 



3. Upper surface of corallum, natural size 467 



3a. Part of upper surface, X 4, to show synapticulae between the costae 467 

 3b. Costae with intervening synapticulae on lower surface, X 4 467 



Plate 134. 



Diploastrea heliopora (Lamarck) Matthai. 

 Four views of the same specimen. 



Fig. 1. Upper surface, natural size ' 470 



la. Costae and intervening synapticulae of lower surface, X 4 470 



16. Calices, X 4, to show synapticulae between the distal ends of the 



septa 470 



1c. Longitudinal section of a corallite, X 4, to show septal perforations, 



synapticulae, and dissepiments 470 



Plate 135. 

 Diploastrea crassolamellata (Duncan) Vaughan. 

 Fig. 1. Cross-section of the corallites of a typical specimen, natural size. Most 



of the septal lamellae appear dark in the figure 474 



2. Cross section of the corallites of a specimen representing Duncan's 



variety nobilis 474 



3. A young, simple corallite, side view, natural size 474 



4. 4a. Two views of the same specimen. 



4. Side view, natural 6ize 474 



4a. Calicular view, natural size 474 



5. 5a, 56. Three views of the same specimen. 



5. Calicular view, natural size 475 



5a. Side view, natural size 475 



56. A calice, X 2 475 



