AKT. 23 A NEW FOSSIL CORAL — HOFFMEISTER 3 



number, arrangement, and appearance. In only one calice are there 

 as many as 26 septa. The septa are not as thick as those usually 

 found on the type but correspond in this respect to some of the other 

 specimens. 



Grateful acknowledgment is made of the aid given by Dr. T. 

 Wayland Vaughan in the description of this coral. 



EXPLANATION OF PLATES 



(All specimens figured in Plates 1 and 2 are from the vicinity of Farmers- 

 Tille, Collin County, Tex.) 



Plate 1 



Hindeastraea coUinensis Hoffmeister 



FiGUEE 1. The ty:^, natural size. U. S. Nat. Mus. Cat. No. 73608. 

 la. The type, calices X 2. 



2. A typical si^ecimen, natural size. U. S. Nat. Mus. Cat. No. 73609. 

 2a. Same specimen, calices X 2. 



Plate 2 



Figure 1. Hindeastraea discoidea White. Paratype. Calices X 4. U. S. Nat. 

 Mus. Cat. No. 19166. 

 la, Hindeastraea discoidea White. Paratype. Bottom view X 4. U. S. 

 Nat. Mus. Cat. No. 19166. 



2. Hindeastraea coUinensis Hoffmeister. A specimen showing varia- 



tion in calicular arrangement. U. S. Nat. Mus. Cat. No. 73609. 



3. Hindeastraea coUinensis Hoffmeister. Specimen with irregular 



growth form. U. S. Nat. Mus. Cat. No. 73609. 



4. Hindeastraea coUinensis Hoffmeister. A specimen showing calices 



X 4. U. S. Nat. Mus. Cat. No. 73609. 



H S.SOVEBNMENT PRlNriNS OFFICE: 1929 



