PLATE XLVIII. 



Hemiaster parastatus (Morton) (p. 92). 



Acad. Nat. Sci. Philadelphia 1487, type. 



Figure la. Upper surface of the test, 

 lb. Lower surface of the test, 

 lc. Lateral surface of the test. 

 Id. Posterior surface of the test, 

 le. Anterior ambulacrum, X 2. 

 If. Portion of petaloidal region of the same, X 8. 

 lg. Portion of basal region, ditto, X 5. 



lh. Several plates from the petaloidal region of the right anterolateral ambulacrum, X 5. 

 li. Three interambulacral plates, with fasciole, X 3. 

 Ik. Portion of fasciole, X 10. 

 11. Tubercle from the side, X 20. 

 lm. Same from above, X 20. 

 In. Apical system, X 5. 



Hemiaster stella (Morton) (p. 93). 



L. S. Nat. Mus. 2208. 

 Figure 2a. Upper surface of the test. 

 2b. Lower surface of the test. 

 2c. Lateral surface of the test. 

 2d. Posterior surface of the test. 



Hemiaster ungula (Morton) (p. 93). 



Acad. Nat. Sci. Philadelphia 1503, type. 



Figure 3a. Upper surface of the test. 

 3b. Lower surface of the test. 

 3c. Lateral surface of the test. 

 3d. Posterior surface of the test. 



3e. Portion of the petaloidal region of the right anterolateral ambulacrum, X 8. 

 3f. Same, anterior ambulacrum, X 8. 

 3g. Apical system, X 5. 



39800°— 15 22 277 



