164 University of Texas Bulletin 



PLATE 8. 



Hemiaster, Epiaster, Enallaster. Plate 8 



Figure 1. Hemiaster longisulcus (Adkins and Winton) 



Occasional, top of Fort Worth limestone. 1/pe individual, x 2.0. Locality: On 

 Cedar Creek, two miles southeast of Blum, Texas. Note the similar pores of 

 the anterior unpaired ambulacrum, and the posteriorly placed apical system. 



Figures 2-3, 5. Hemiaster riovistae n. sp Page 115 



x 2.0. Locality: 720, near Riovista, Texas. 



Figure 4. Enallaster bravoensis Bosc Page 114 



Occasional, Weno formation, marl and clay facies; rare, Pawpaw, Mainstreet and 

 Buda formations; abundant, Grayson formation, marl and clay facies. Fig. 4, 

 individual x 2.0. Locality 618, near Fort Worth, Texas. 



Figure 6. Hemiaster calvini Clark Page 114 



Locality unknown, Cummins Collection. Note position of apical system, and the 

 deep ambulacra! grooves. 



Figure 7. Epiaster aguilerae Bose Page 109 



Rare, basal Fort Worth limestone. Locality: 406, one-half mile east of Texas 

 Christian University, Fort Worth, Texas. (Same individual as PL 5, fig. 5.) 

 Apical system, x 4.0. 



