466 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Cuba, station 7514, 5 miles east of monument H4 of U. S. Naval 

 Reservation, Guatanamo, altitude 400 feet a. t., collected by O. E. 

 Meinzer, 



Mexico, in the San Rafael formation, 4 miles east of Salitre Ranch^ 

 State of Tamaulipas, collected by W. F. Cummins and J. M. Sands. 



The foregoing description, except the measurements of the large 

 specimens, is based entirely on the five specimens represented by 

 plate 129, figure 2; plate 130, figures 1, la, 3; plate 131, figures 1, la^ 

 16, 2, 3. Two of these specimens, plate 129, figure 2 and plate 130, 

 figures 1, la, 3, are from station 6881, Willoughby Bay; and three,, 

 plate 131, figures 1, la, Ih, 2, 3, are from station 6854, Rifle Butts 

 Antigua, The specimen from Salitre Ranch, Tamaulipas, Mexico, 

 is so completely typical that no further notes on it are necessary. 

 Two of the specimens from Porto Rico, plate 132, figures 1, 2, 2a, 2&,. 

 have thicker primary and secondary septa, and the costae corre- 

 sponding to the last cycle of septa seem usually to be small or even 

 obsolete in places. The rear side of the specimen, general view^ 

 plate 132, figure 2, has calices and costae so nearly typical that it 

 can scarcely be regarded as more than a variant of C. antiguensis. 



The specimen from station 7514, near Guatanamo, represents the 

 same variant as the Porto Rico specimens. 



Duncan's Astroria affinis, I believe, is based on a specimen of 

 Oyaihomorpha antiguensis that has crowded, polygonal corallites, 

 Plate 133, figure 1, represents the type (No. 12938, Coll. Geol. Soc.^ 

 London), and the following is the original description: '' Corallites 

 crowded. Walls very thin indeed. Transverse section of corallites 

 polygonal, rarely forming short series. Columella slightly but 

 decidedly developed. Septa alternately large and very small, linear^ 

 a little larger externally, with at least four cycles in six systems. 

 Breadth of the calices foiu- lines [8.4 mm.]; five septa to one line 

 [2.1 mm.], Endotheca abundant. 



"From the Chert-formation of Antigua. Coll. Geol. Soc." 



In my notes on the type, I say that A. affinis is undoubtedly the 

 same as Duncan's Astroria antiguensis type (No. 12936, Coll. GeoL 

 Soc. London), illustrated by plate 131, figure 4 of this paper; but I 

 am not certain that it is different from 0. tenuis, the species to be 

 considered next. The original description is as follows : 



"Corallites not crowded, but close, tall. Walls rather thin. The 

 transverse section of the corallites is in many cases ckcular, in 

 others obscurely polygonal; some present short series, but rarely. 

 Columella very indistinct. Septa alternately large and small, in six 

 systems of four cycles, the fourth being occasional!}^ deficient in two 

 systems. Breadth of the corallites, from 2 to 3^ lines [4.2 to 7.3 mm.]. 

 Length of the series, 6 lines [12.7 mm.]; five septa to a line [2.1 mm.]. 

 Endotheca abundant. 



